THD Electronics BIV30C BiValve-30 Cage Head, Black, 120V

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The THD BiValve-30 30W Class A Amplifier Head is a pure Class A design with 2 output tubes wired in parallel and combined through a special output transformer to deliver up to 30W. It accepts almost any type of output or preamp tube without bias adjustment-even in combination-for an astonishingly wide range of tone available for nearly any style of guitar playing. The standard of construction is absolutely top class, as you would expect for any handmade amplifier.Underneath its large, perforated steel lid you'll find large transformers and hi-fi style internal baffle plates to cut down on hum, as well as the tube sockets. On its front panel is a pair of input jacks labeled More and Less, followed by a Cut switch (high-cut filter), Volume, Treble, Bass, and Attitude (driver tube response control). In the center is a light bulb that glows as the amp distorts with a small switch to turn it off, a control for the built-in Hot Plate (output attenuator), and a defeat switch for the Hot Plate.The amp sports an acid-etched control plate with a delicate marine theme inspired by Glasgow artist Charles Rennie Mackintosh.
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- Make all of your Tone Dreams come true with the THD BiValve-30. Great headroom, shimmery highs and tight bass characterize this little monster.
- Like the UniValve, the BiValve-30 is a Single-Ended Class A amplifier head but with two output tubes 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
- This is the standard "cage head" version, complete with a perforated steel cage to protect the tubes while providing ample ventilation.
- "Limitless tonal range, good looks and useful features, with volume to spare for live use." - Guitarist Magazine
- Hand-built in Seattle, WA.
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THD Electronics FLX50C Flexi-50 Cage Head, Black, 120V

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The precision, hand-built, single-channel THD Flexi-50 50W/20W Class AB Amplifier Head can operate loaded with almost any preamp and power tubes in any combination. It's the only amplifier you need to own. Whether you strive for English overdrive, California clean, or Texas punch, this master-class head can deliver it. It also boasts a heady 50W Class-AB operation, footswitchable overdrive/boost, and footswitchable master volume control. Its consistently overbuilt and pristine circuitry ensures dramatic touch sensitivity even at the highest overdrive settings. Its incredible flexibility (the reason it's named Flexi-50) delivers all the sounds and tones you could possibly desire, from vintage purr to modern, high-gain roar.It has a Lo/Hi input switch; Volume, Treble, Middle, Bass, Master, and Cut knobs; Boost section with separate Gain and Tone knobs, and a wattage select switch (50W/20W).
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- English Overdrive California Clean. Texas Punch.
- "If youre a tone tweaker with a good assortment of tubes, youll have a blast experimenting with more unusual tube types and combinations in the quest to find a personalized sound thats as unique and fresh as the Flexi-50s design. This is an outstanding amp, and it wins an Editors Pick Award." - Guitar Player Magazine
- This is the standard "cage head" version, complete with a perforated steel cage to protect the tubes while providing ample ventilation.
- "The tone is simply breathtaking, and for evoking the likes of Kossoff, SRV and Rory Gallagher or Hendrix, it's probably close as you'll get without reincarnation." - Guitarist Magazine
- Hand-built in Seattle, WA.
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THD Electronics UNI15C UniValve Cage Head, Black, 120V

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The THD UniValve 15W Class A Amplifier Head delivers tones from smooth and clear to warm and full to aggressive overdrive. The single-ended Class A circuit design uses the highest-quality parts and hand-built construction for clean and faultless operation.The single output tube can be switched at will with nearly any octal-based power tube for different tones without re-biasing the amp, and the 2 preamp tubes can be switched for any combination of 12AX7, 12AT7, 12AU7, 12AY7, or 12AZ7 tubes.The UniValve is easily capable of driving a 4x12" cabinet, yet is also small and light. Its built-in Hot Plate Power Attenuator lets you experience the indescribable freedom of wailing away with full output distortion at volume levels that are quiet enough to let your neighbors sleep.There are 2 inputs-one for high gain and one for low gain. With 12AX7 preamp tubes, the low gain input gives a wide range of sounds from Nashville clean and crisp to Memphis down and dirty. With the controls pegged and a relatively high-output humbucker, the low-gain input delivers a tantalizing Texas blues overdrive. Plug into the high-gain input for a whole new world-from early British Invasion tones to modern high-gain metal attack-but with none of the mush and confusion normally associated with high-gain tones.The controls include the traditional Volume, Treble, and Bass along with an Attitude control knob that determines how the driver stage responds to signal and how it drives the power tube. There are also controls for the Hot Plate, including a hard-bypass switch. The noise reduction circuit in the Hot Plate features a light bulb fixture on the front panel that glows when you play. There is an On-Off switch for the light bulb.On the back panel the UniValve has a transformer-isolated line out with an adjustable level control and a switch to choose line-level or instrument-level signal. The speaker outs on the UniValve can drive any speaker load from 2 ohms all the way up to 16 ohms. When t
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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
- This is the standard "cage head" version, complete with a perforated steel cage to protect the tubes while providing ample ventilation.
- "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
- Hand-built in Seattle, WA.
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