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THD BiValve-30
Instruction Manual
Thank you for your purchase of the THD BiValve-30 amplifier! The big brother of the
THD UniValve, the BiValve-30 is a Single-Ended Class-A amplifier head with dual
output tubes that can be switched at will among many octal-based power tubes, including
6L6, EL-34, 6550, 6CA7. 6V6, 6K6, KT-90, KT-88, KT-77 and KT-66, for different
tones without re-biasing the amp. The two output tubes do not need to be matched in any
way—you are free to experiment with any combination you want! Likewise, the two
preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7 or 12AZ7. The
BiValve-30 delivers tones from smooth and clear to very aggressive overdrive, like the
UniValve, but with more power and a much more compliant output transformer for
thicker lows. It is easily capable of driving a 4x12" cabinet, yet quite small and relatively
light. Finally, it has a built-in Hot Plate® Power Attenuator that allows for full output
distortion at almost any volume. The unique combination of our touch-sensitive input
circuit and the wonderfully active and reactive tone control section (that we slaved a year
to perfect) make for a front-end that really responds to subtle and not-so-subtle changes
in the signal being fed into the amplifier either by the guitar or any effect that may be
between the guitar and the amplifier.
THD BIVALVE-30 INSTRUCTION MANUAL
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Summary of Contents for THD BiValve-30
- Page 1 THD BiValve-30 Instruction Manual Thank you for your purchase of the THD BiValve-30 amplifier! The big brother of the THD UniValve, the BiValve-30 is a Single-Ended Class-A amplifier head with dual output tubes that can be switched at will among many octal-based power tubes, including 6L6, EL-34, 6550, 6CA7.
- Page 2 THD BIVALVE-30 INSTRUCTION MANUAL...
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Page 3: Table Of Contents
THD Electronics Contact Information... 8 What Does “Class-A” Mean? At the beginning of this manual, we explained that the BiValve-30 is a “Single-Ended Class-A” amplifier—but what does that mean? “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. -
Page 4: Bivalve-30 Controls
6. Attitude: The attitude knob determines how the driver tube responds to the signal, and how it drives the power tube. If the Attitude knob is turned up, the BiValve-30 will sound edgier and more aggressive. With the Attitude knob turned down, the BiValve-30 sounds sweeter and more controlled. - Page 5 Simply unscrew the lens and replace with a #1818 bulb only. These bulbs are available through any THD dealer or directly from THD. They can also be found at most electronic supply houses.
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Page 6: Back Panel
BiValve-30’s Return jack. You can also use the send to connect the BiValve-30’s preamp to the return of any other amp with an effects loop in order to use the preamp of the BiValve-30 with the power section of that amp. -
Page 7: Switching Tubes In The Bivalve-30
BiValve-30, but simply switching the tubes to their preference, can have noticeably different tones. NOTE: If you want to use an EL-84 power tube, you will need to use the THD YJUni Adapter, which is specially designed to allow you to use EL-84 tubes in a self-biasing, Class-A amplifier like the UniValve or BiValve-30. -
Page 8: Thd Electronics Contact Information
ECC83, ECC82, ECC81 and more. You can try any of the above tube types in any combination—remember, experimentation is the name of the game! THD Electronics Contact Information THD Electronics, Ltd. 3510 6th Avenue W Seattle, WA 98119 - 1513 Phone: 206.781.5500 Fax: 206.781.5508 info@thdelectronics.com http://www.thdelectronics.com THD BIVALVE-30 INSTRUCTION MANUAL...
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