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  • THD Bivalve


    THD BiValve-30 30W Class A Amplifier Head
    30W Class A amplifier
    Single channel
    Hand built
    Accepts almost any preamp and power tubes in any combination
    Ships with 2 12AX7s (preamp) and 2 EL34s (power amp)
    More and Less inputs
    Volume, Treble, Bass, and Attitude knobs

  • THD Hot Plate 16 Blue


    I. Main Output:
    Attenuation: 0 dB to -16 dB in four dB increments; -16 dB to -∞ dB (zero output)
    continuously variable.
    Impedance: Depends on the model.
    II. Line output:
    Type: Mid-impedance (approx. 35KΩ), unbalanced, negative ground.
    Connector: 1/4” phone jack.
    Level: Continuously variable line out level (+10dB(V) to -40dB(V)).
    III. Input:
    Impedance: Depends on model.
    Continuous power dissipation: 150W RMS
    Max. recommended amplifi er power: 185W RMS.
    IV. General:
    Size: 2 7/8” high x 8 1/4” wide x 7 1/4” deep (7.3 cm x 20.9 cm x 18.4 cm).
    Weight: 4.2 lbs (1.9 kg).

  • THD Univalve


    15W Class A amplifier
    Single-ended Class A circuit
    Accepts almost any power tubes in any combination
    Ships with 2 – 12AX7s (preamp) and a single EL34 (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