THD Electronics YJUNITRIODE Yellow Jacket for UniValve, Single, Triode-Type, w/Tube

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The YJUNIV is an adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.THD's Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket converters internally regulates voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types.
- Incliude one Yellow Jacket Converter and one EL84 power tube.
- Triode type for THD UniValve and Bi-Valve-30 amplifiers. Reduces the power by about 80% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain and greated touch-sensitivity, all at a much lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJUNI Yellow Jacket for UniValve, Single, w/Tube

Buy Cheap THD Electronics YJUNI Yellow Jacket for UniValve, Single, w/Tube

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Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types.
- Incliude one Yellow Jacket Converter and one EL84 power tube.
- Standard type for THD UniValve and Bi-Valve-30 amplifiers. Reduces the power by about 50% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain, richer mid-range harmonic content and greated touch-sensitivity, all at a lower volume.
- Hand-built in Seattle, WA.
See more technical details

 "Great" 2009-07-27
By Steven Woolgar (Portland, Oregon)
This sounds great in my UniValve. Still too damned loud, but I will be helping that by changing my 4x10 with a 1x12 (and maybe changing the pre and driver tubes). The only downside and the reason I am docking this by one star is that with the adapter and the EL84, you can no longer put the cage on the THD Univalve since the tube is too tall.


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THD Electronics YJSQTRIODE Yellow Jacket Standard Quartet, Triode-Type, w/Tubes

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The YJS is an adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.THD's Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket converters internally regulates voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6, E
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types, and converts any amp to Class-A operation.
- Incliude four Yellow Jacket Converters and four EL84 power tubes.
- Triode type for most 6V6, 6L6 and EL34 amps. Reduces the power by about 80% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain and greated touch-sensitivity, all at a much lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJSQ Yellow Jacket Standard Quartet, w/Tubes

Buy Cheap THD Electronics YJSQ Yellow Jacket Standard Quartet, w/Tubes

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Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types, and converts any amp to Class-A operation.
- Incliude four Yellow Jacket Converters and four EL84 power tubes.
- Standard type for most 6V6, 6L6 and EL34 amplifiers. Reduces the power by about 50%.
- Gives smoother overdrive, more sustain, richer mid-range harmonic content and greated touch-sensitivity, all at a lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJSHORTD Yellow Jacket Short Duet, w/Tubes

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An adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.Yellow Jacket converters not only rearrange the pin locations of the tubes, but they also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced and current is limited to protect the EL84 and drop output power. When a pair of Yellow Jackets are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jacket. In a 100W amp like a Twin Reverb or Marshall 100, either two or four Yellow Jackets can be used. If only two are used and the other two sockets are left empty, the output is dropped to about 20 watts. With four in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. Because all Yellow Jacket Converters limit voltage and current internally, they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher-powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6, EL34, or 7
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types, and converts any amp to Class-A operation.
- Incliude two Yellow Jacket Converters and two EL84 power tubes.
- Standard type for most 6V6, 6L6 and EL34 amplifiers with limited height. Reduces the power by about 50%.
- Gives smoother overdrive, more sustain, richer mid-range harmonic content and greated touch-sensitivity, all at a lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJCTRIODE Yellow Jacket for Cathode-Bias Amps, Single, Triode-Type, w/Tube

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The YJC is an adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in cathode-biased amps. There are no adjustments to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.THD's Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket converters internally regulates voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types, and converts any amp to Class-A operation.
- Incliude one Yellow Jacket Converter and one EL84 power tube.
- Triode type for most cathode-biased 6V6, 6L6 and EL34 amps. Reduces the power by about 80% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain and greated touch-sensitivity, all at a much lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJCDTRIODE Yellow Jacket for Cathode-Bias Amps, Duet, Triode-Type, w/Tubes

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The YLSD is an adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.THD's Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt you...
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types, and converts any amp to Class-A operation.
- Incliude two Yellow Jacket Converters and two EL84 power tubes.
- Triode type for most cathode-biased 6V6, 6L6 and EL34 amps. Reduces the power by about 80% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain and greated touch-sensitivity, all at a much lower volume.
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics YJCDTRIODE Yellow Jacket for Cathode-Bias Amps, Duet, Triode-Type, w/Tubes Now

THD Electronics YJBIVTRIODE Yellow Jacket for BiValve-30, Duet, Triode-Type, w/Tubes

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The YJUNIV is an adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.THD's Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket converters internally regulates voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types.
- Incliude two Yellow Jacket Converters and two EL84 power tubes.
- Triode type for THD UniValve and Bi-Valve-30 amplifiers. Reduces the power by about 80% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain and greated touch-sensitivity, all at a much lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJBIV Yellow Jacket for BiValve-30, Duet, w/Tubes

Buy Cheap THD Electronics YJBIV Yellow Jacket for BiValve-30, Duet, w/Tubes

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Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6 and EL34 types.
- Incliude two Yellow Jacket Converters and two EL84 power tubes.
- Standard type for THD UniValve and Bi-Valve-30 amplifiers. Reduces the power by about 50% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain, richer mid-range harmonic content and greated touch-sensitivity, all at a lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJ7591DTRIODE Yellow Jacket for Amps w/7591 Tubes, Duet, Triode-Type, w/Tubes

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The YJ7591D is an adapter that permits the use of an EL84 power tube in 7591 amps. There are no adjustments to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.THD's Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket converters internally regulates voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6, EL34 or 7591, so the Yellow Jacket
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 7591 types, and converts any amp to Class-A operation.
- Incliude two Yellow Jacket Converters and two EL84 power tubes.
- Triode type for most 7591 amps. Reduces the power by about 80% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain and greated touch-sensitivity, all at a much lower volume.
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics YJ7591DTRIODE Yellow Jacket for Amps w/7591 Tubes, Duet, Triode-Type, w/Tubes Now

THD Electronics YJ7591D Yellow Jacket for Amps w/7591 Tubes, Duet, w/Tubes

Buy Cheap THD Electronics YJ7591D Yellow Jacket for Amps w/7591 Tubes, Duet, w/Tubes

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Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 7591 types, and converts any amp to Class-A operation.
- Incliude two Yellow Jacket Converters and two EL84 power tubes.
- Standard type for most 7591 amplifiers. Reduces the power by about 50%.
- Gives smoother overdrive, more sustain, richer mid-range harmonic content and greated touch-sensitivity, all at a lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJ20STRIODE Yellow Jacket for 6V6 Amps, Single, Triode-Type, w/Tube

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The YJ20S is an adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.THD's Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket converters internally regulates voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6,
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6 types, and converts any amp to Class-A operation.
- Incliude one Yellow Jacket Converter and one EL84 power tube.
- Triode type for most 6V6 amps. Reduces the power by about 50% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain and greated touch-sensitivity, all at a much lower volume.
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics YJ20STRIODE Yellow Jacket for 6V6 Amps, Single, Triode-Type, w/Tube Now

THD Electronics YJ20S Yellow Jacket for 6V6 Amps, Single, w/Tube

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Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6 types, and converts any amp to Class-A operation.
- Incliude one Yellow Jacket Converter and one EL84 power tube.
- Standard type for most 6V6 amps. Does not appreciably reduce the power of the amplifier.
- Gives smoother overdrive, more sustain, richer mid-range harmonic content and greated touch-sensitivity.
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics YJ20S Yellow Jacket for 6V6 Amps, Single, w/Tube Now

THD Electronics YJ20DTRIODE Yellow Jacket for 6V6 Amps, Duet, Triode-Type, w/Tubes

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The YJ20S is an adapter that permits the use of an EL84 power tube in place of a 6L6, EL34, or 6550 in grid-bias amps. There are no adjustments to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.THD's Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.When the Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in place, the amp puts out about 40W and takes on a whole new warmth and richness.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket converters internally regulates voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6,
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6 types, and converts any amp to Class-A operation.
- Incliude two Yellow Jacket Converters and two EL84 power tubes.
- Triode type for most 6V6 amps. Reduces the power by about 50% and converts the amplifier to Triode operation.
- Gives smoother overdrive, more sustain and greated touch-sensitivity, all at a much lower volume.
- Hand-built in Seattle, WA.
See more technical details

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THD Electronics YJ20D Yellow Jacket for 6V6 Amps, Duet, w/Tubes

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An adapter that permits the use of an EL84 power tube in place of a 6V6 in cathode-bias amps without dropping the power. There are no adjustments to make and no modifications necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, screw the ground wires under one of the output tube socket mounting screws, plug the provided EL84s into the Yellow Jacket, turn on the amp, and play.Yellow Jacket converters not only rearrange the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.In Champ- and Deluxe-type amplifiers, the Yellow Jacket output is smooth, strong and more even than with the stock 6V6s. Any 6V6 using amplifier is instantly converted to a Class A monster with great response and output.Will they hurt your amp? No! Yellow Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket Converters internally limit voltage and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6, EL34 or 7591, so the Yellow Jacket will reduce the strain on the filament windings of the power transformer as well.
Readmore

Technical Details

- Yellow Jackets are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6 types, and converts any amp to Class-A operation.
- Incliude two Yellow Jacket Converters and two EL84 power tubes.
- Standard type for most 6V6 amps. Does not appreciably reduce the power of the amplifier.
- Gives smoother overdrive, more sustain, richer mid-range harmonic content and greated touch-sensitivity.
- Hand-built in Seattle, WA.
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THD Electronics UNI15R-RED UniValve, Rack-Mounted, Red-Anodized 120V

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The THD UniValve Rackmounted Guitar Amplifier Head is a single-ended class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes, including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp. Likewise, the two preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7 or 12AZ7. The UniValve delivers tones from smooth and clear to very aggressive overdrive. It is quite small and light, yet easily capable of driving a 4 x 12" cabinet. It has a built-in hot plate power attenuator that allows for full output distortion at almost any volume. And it doesn't cost as much as you might think.What is a Class A? Class A is a term given to an amp that runs its tubes at full current all the time, unlike most tube amps that alternate between running one set of tubes and the other set, each for one half of the wave. The set not in use is turned off by a positive swing of the grid voltage. Single-ended output stages always operate in Class A. Most push-pull amplifiers, including the venerated Vox AC-30 operate in Class AB when overdriven, even if they are in Class A while clean. The upshot is that Class A operation has its own unique tone characteristics that set it apart from other tube amp classes. Class A amps sound great at low volumes, and even better as you turn them up. Thus, with the relatively low wattage of the UniValve you can turn up the amplifier to take full advantage of its stunning output distortion tone without deafening anyone. Why the self-biasing feature? The UniValve's circuitry senses the current needs of the output tube and provides the correct bias volt-age to the cathode of the output tube regardless of tube type or wear. This means that, without any trip to an amp technician, you can simply replace the output tube with one that has different sound characteristics. (Of course, you can also change the preamp tubes at will for even more tonal varia
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Technical Details

- The THD UniValve is a Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp
- "Its one of the worlds best sounding, best looking and best made amps." - Guitarist Magazine
- The face is blue-anodized brushed aluminum. All other parts are black powder-coated steel.
- Provides ample ventilation for the preamp and power tubes.
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics UNI15R-RED UniValve, Rack-Mounted, Red-Anodized 120V Now

THD Electronics UNI15R-PRL UniValve, Rack-Mounted, Purple-Anodized 120V

Buy Cheap THD Electronics UNI15R-PRL UniValve, Rack-Mounted, Purple-Anodized 120V

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The THD UniValve Rackmounted Guitar Amplifier Head is a single-ended class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes, including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp. Likewise, the two preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7 or 12AZ7. The UniValve delivers tones from smooth and clear to very aggressive overdrive. It is quite small and light, yet easily capable of driving a 4 x 12" cabinet. It has a built-in hot plate power attenuator that allows for full output distortion at almost any volume. And it doesn't cost as much as you might think.What is a Class A? Class A is a term given to an amp that runs its tubes at full current all the time, unlike most tube amps that alternate between running one set of tubes and the other set, each for one half of the wave. The set not in use is turned off by a positive swing of the grid voltage. Single-ended output stages always operate in Class A. Most push-pull amplifiers, including the venerated Vox AC-30 operate in Class AB when overdriven, even if they are in Class A while clean. The upshot is that Class A operation has its own unique tone characteristics that set it apart from other tube amp classes. Class A amps sound great at low volumes, and even better as you turn them up. Thus, with the relatively low wattage of the UniValve you can turn up the amplifier to take full advantage of its stunning output distortion tone without deafening anyone. Why the self-biasing feature? The UniValve's circuitry senses the current needs of the output tube and provides the correct bias volt-age to the cathode of the output tube regardless of tube type or wear. This means that, without any trip to an amp technician, you can simply replace the output tube with one that has different sound characteristics. (Of course, you can also change the preamp tubes at will for even more tonal varia
Readmore

Technical Details

- The THD UniValve is a Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp
- "Its one of the worlds best sounding, best looking and best made amps." - Guitarist Magazine
- The face is red-anodized brushed aluminum. All other parts are black powder-coated steel.
- Provides ample ventilation for the preamp and power tubes.
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics UNI15R-PRL UniValve, Rack-Mounted, Purple-Anodized 120V Now

THD Electronics UNI15R-GRN UniValve, Rack-Mounted, Green-Anodized 120V

Buy Cheap THD Electronics UNI15R-GRN UniValve, Rack-Mounted, Green-Anodized 120V

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The THD UniValve Rackmounted Guitar Amplifier Head is a single-ended class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes, including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp. Likewise, the two preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7 or 12AZ7. The UniValve delivers tones from smooth and clear to very aggressive overdrive. It is quite small and light, yet easily capable of driving a 4 x 12" cabinet. It has a built-in hot plate power attenuator that allows for full output distortion at almost any volume. And it doesn't cost as much as you might think.What is a Class A? Class A is a term given to an amp that runs its tubes at full current all the time, unlike most tube amps that alternate between running one set of tubes and the other set, each for one half of the wave. The set not in use is turned off by a positive swing of the grid voltage. Single-ended output stages always operate in Class A. Most push-pull amplifiers, including the venerated Vox AC-30 operate in Class AB when overdriven, even if they are in Class A while clean. The upshot is that Class A operation has its own unique tone characteristics that set it apart from other tube amp classes. Class A amps sound great at low volumes, and even better as you turn them up. Thus, with the relatively low wattage of the UniValve you can turn up the amplifier to take full advantage of its stunning output distortion tone without deafening anyone. Why the self-biasing feature? The UniValve's circuitry senses the current needs of the output tube and provides the correct bias volt-age to the cathode of the output tube regardless of tube type or wear. This means that, without any trip to an amp technician, you can simply replace the output tube with one that has different sound characteristics. (Of course, you can also change the preamp tubes at will for even more tonal varia
Readmore

Technical Details

- The THD UniValve is a Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp
- "Its one of the worlds best sounding, best looking and best made amps." - Guitarist Magazine
- The face is gold-anodized brushed aluminum. All other parts are black powder-coated steel.
- Provides ample ventilation for the preamp and power tubes.
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics UNI15R-GRN UniValve, Rack-Mounted, Green-Anodized 120V Now

THD Electronics UNI15R-GLD UniValve, Rack-Mounted, Gold-Anodized 120V

Buy Cheap THD Electronics UNI15R-GLD UniValve, Rack-Mounted, Gold-Anodized 120V

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Readmore

Technical Details

- The THD UniValve is a Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp
- "Its one of the worlds best sounding, best looking and best made amps." - Guitarist Magazine
- The face is purple-anodized brushed aluminum. All other parts are black powder-coated steel.
- Provides ample ventilation for the preamp and power tubes.
- Hand-built in Seattle, WA.
See more technical details

Images Product

Buy THD Electronics UNI15R-GLD UniValve, Rack-Mounted, Gold-Anodized 120V Now

THD Electronics UNI15R-BLU UniValve, Rack-Mounted, Blue-Anodized 120V

Buy Cheap THD Electronics UNI15R-BLU UniValve, Rack-Mounted, Blue-Anodized 120V

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Readmore

Technical Details

- The THD UniValve is a Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp
- "Its one of the worlds best sounding, best looking and best made amps." - Guitarist Magazine
- The face is green-anodized brushed aluminum. All other parts are black powder-coated steel.
- Provides ample ventilation for the preamp and power tubes.
- Hand-built in Seattle, WA.
See more technical details

Images Product

Buy THD Electronics UNI15R-BLU UniValve, Rack-Mounted, Blue-Anodized 120V Now

THD Electronics UNI15R-BLK UniValve, Rack-Mounted, Black 120V

Buy Cheap THD Electronics UNI15R-BLK UniValve, Rack-Mounted, Black 120V

Buy Low Price From Here Now
The THD UniValve Rackmounted Guitar Amplifier Head is a single-ended class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes, including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp. Likewise, the two preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7 or 12AZ7. The UniValve delivers tones from smooth and clear to very aggressive overdrive. It is quite small and light, yet easily capable of driving a 4 x 12" cabinet. It has a built-in hot plate power attenuator that allows for full output distortion at almost any volume. And it doesn't cost as much as you might think.What is a Class A? Class A is a term given to an amp that runs its tubes at full current all the time, unlike most tube amps that alternate between running one set of tubes and the other set, each for one half of the wave. The set not in use is turned off by a positive swing of the grid voltage. Single-ended output stages always operate in Class A. Most push-pull amplifiers, including the venerated Vox AC-30 operate in Class AB when overdriven, even if they are in Class A while clean. The upshot is that Class A operation has its own unique tone characteristics that set it apart from other tube amp classes. Class A amps sound great at low volumes, and even better as you turn them up. Thus, with the relatively low wattage of the UniValve you can turn up the amplifier to take full advantage of its stunning output distortion tone without deafening anyone. Why the self-biasing feature? The UniValve's circuitry senses the current needs of the output tube and provides the correct bias volt-age to the cathode of the output tube regardless of tube type or wear. This means that, without any trip to an amp technician, you can simply replace the output tube with one that has different sound characteristics. (Of course, you can also change the preamp tubes at will for even more tonal varia
Readmore

Technical Details

- The THD UniValve is a Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp
- "Its one of the worlds best sounding, best looking and best made amps." - Guitarist Magazine
- All parts are black powder-coated steel.
- Provides ample ventilation for the preamp and power tubes.
- Hand-built in Seattle, WA.
See more technical details

Images Product

Buy THD Electronics UNI15R-BLK UniValve, Rack-Mounted, Black 120V Now

THD Electronics UNI112BLK UniValve 1-12 Combo, Black, 120V

Buy Cheap THD Electronics UNI112BLK UniValve 1-12 Combo, Black, 120V

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This THD amp is a 15W, 1x12 combo version of the UniValve and features the same Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes, including 6L6, EL34, 6550, KT90, KT88, KT77, and KT66 for different tones without re-biasing the amp. Likewise, the 2 preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7 or 12AZ7. The UniValve delivers tones from smooth and clear to very aggressive overdrive. It is easily capable of driving a 4 x 12" cabinet, yet quite small and light. The 15W THD UniValve amp has a built-in Hot Plate Power Attenuator that allows for full output distortion at almost any volume. And it doesn't cost as much as you might think.What is a Class A? Class A is a term given to an amp that runs its tubes at full current all the time, unlike most tube amps that alternate between running one set of tubes and the other set, each for one half of the wave. The set not in use is turned off by a positive swing of the grid voltage. Single-ended output stages always operate in Class A. Most push-pull amplifiers operate in Class AB when overdriven, even if they are in Class A while clean. The upshot is that Class A operation has its own unique tone characteristics that set it apart from other tube amp classes. Class A amps sound great at low volumes and even better as you turn them up. Thus, with the relatively low wattage of the THD UniValve, you can turn up the amplifier to take full advantage of its stunning output distortion tone without deafening anyone.Why the self-biasing feature? The UniValve tube amp's circuitry senses the current needs of the output tube and provides the correct bias voltage to the cathode of the output tube regardless of tube type or wear. This means that, without any trip to an amp technician, you can simply replace the output tube with one that has different sound characteristics. (Of course, you can also change the preamp tubes at will for e
Readmore

Technical Details

- The THD UniValve is a Single-Ended Class A amplifier head with a single output tube that can be switched at will among many octal-based power tubes including 6L6, EL34, 6550, KT90, KT88, KT77 and KT66, for different tones without re-biasing the amp
- "Its one of the worlds best sounding, best looking and best made amps." - Guitarist Magazine
- "Just when you think there are no new tricks in the boutique world, THD has pulled a rabbit out of a hat with this baby. With its tonal range, smart features, and superb craftmanship, the UniValve is a bang-for-buck winner." - Guitar Player Magazine
- For every 1x12 combo amp sold, THD Electronics donates to American Forests to have two trees planted. Your purchase helps the environment!
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics UNI112BLK UniValve 1-12 Combo, Black, 120V Now

THD Electronics RACKIT-RED Rack-Mount Conversion Kit for UniValve, BiValve-30, Deco-36 or Flexi-50, Red-Anodized

Buy Cheap THD Electronics RACKIT-RED Rack-Mount Conversion Kit for UniValve, BiValve-30, Deco-36 or Flexi-50, Red-Anodized

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Technical Details

- Kit to convert your THD amplifier to a rack-mounted version.
- This kit provides all of the hardware and sheet metal parts to convert any THD UniValve, BiValve-30, Deco-36 or Flexi-50 to a 5-space, 19" rack-mount unit.
- The face is red-anodized brushed aluminum. All other parts are black powder-coated steel.
- Provides ample ventilation for the preamp and power tubes.
- Hand-built in Seattle, WA.
See more technical details

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Buy THD Electronics RACKIT-RED Rack-Mount Conversion Kit for UniValve, BiValve-30, Deco-36 or Flexi-50, Red-Anodized Now