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guitarflow, John Suhr Guitars, Suhr Amps, Fuchs, Amps, Suhr Pickups, Madison Amps, Madison PA, THD Amps, Allparts Products, Traynor Amps, Yorkville, Apex













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THD Univalve, Bivalve & Flexi 50
Man needs this kind of versatility.



ThdUnivalvefront-angleTHDFlexiFrontTHDBivalveFrontAngle





The THD Flexi-50™ Amplifier
50W/20W Class AB amplifier. Hand-built. Wattage select switch (50W/20W). Single channel. Footswitchable overdrive/boost and master volume control. Accepts almost any preamp and power tubes in any combination. Ships with 3 - 12AX7s (preamp) and 2 EL34s (power amp). Lo/Hi input switch. Volume, Treble, Middle, Bass, Master, and Cut knobs. Boost section with separate Gain and Tone knobs.
  • 50W/20W Class AB amplifier
  • Hand-built
  • Wattage select switch (50W/20W)
  • Single channel
  • Footswitchable overdrive/boost and master volume control
  • Accepts almost any preamp and power tubes in any combination
  • Ships with 3 - 12AX7s (preamp) and 2 EL34s (power amp)
  • Lo/Hi input switch
  • Volume, Treble, Middle, Bass, Master, and Cut knobs
  • Boost section with separate Gain and Tone knobs


THD BiValve-30 30W Class A Amplifier Head

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.

THD BiValve-30 30W Class A Amplifier Head Specifications:

  • 15-1/2"W x 8-3/4"H x 10-3/4"D
  • 38 lbs.

THD BiValve-30 30W Class A Amplifier Head Features:

  • 30W Class A amplifier
  • Single channel
  • Hand built
  • Accepts almost any preamp and power tubes in any combination
  • Ships with 3 - 12AX7s (preamp) and 2 EL34s (power amp)
  • More and Less inputs
  • Volume, Treble, Bass, and Attitude knobs
  • Built-in Hot Plate output attenuator
 

THD UniValve 15W Class A Amplifier Head

15W Class A amplifier. Single-ended Class A circuit. Hand built. Accepts almost any power tubes in any combination. Ships with 2 - 12AX7s (preamp) and a single EL34s (power amp). 2 preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7, or 12AZ7 tubes. 2 inputs: one for high gain and one for low gain. Volume, Treble, Bass, and Attitude knobs. Built-in Hot Plate output attenuator. Volume, Treble, and Bass controls. Attitude control knob. Hard-bypass switch for Hot Plate. Light bulb noise-reduction circuit. On-Off switch for light bulb circuit. Transformer-isolated line out with adjustable level control. Choose Line-Level or Instrument-Level signal. 2 ohms to 16 ohms speaker load. Built-in dummy load.
  • 15W Class A amplifier
  • Single-ended Class A circuit
  • Hand built
  • Accepts almost any power tubes in any combination
  • Ships with 2 - 12AX7s (preamp) and a single EL34s (power amp)
  • 2 preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7, or 12AZ7 tubes
  • 2 inputs: one for high gain and one for low gain
  • Volume, Treble, Bass, and Attitude knobs
  • Built-in Hot Plate output attenuator
  • Volume, Treble, and Bass controls
  • Attitude control knob
  • Hard-bypass switch for Hot Plate
  • Light bulb noise-reduction circuit
  • On-Off switch for light bulb circuit
  • Transformer-isolated line out with adjustable level control
  • Choose Line-Level or Instrument-Level signal
  • 2 ohms to 16 ohms speaker load
  • Built-in dummy load

 



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