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THD UniValve
Instruction Manual
Thank you for your purchase of the THD UniValve amplifier! 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, EL-34, 6550, 6CA7, 6V6,
6K6, KT-90, KT-88, KT-77 and KT-66, 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 easily capable of driving a 4x12" cabinet, yet quite small and 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 UNIVALVE INSTRUCTION MANUAL
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Summary of Contents for THD UniValve
- Page 1 THD UniValve Instruction Manual Thank you for your purchase of the THD UniValve amplifier! 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, EL-34, 6550, 6CA7, 6V6, 6K6, KT-90, KT-88, KT-77 and KT-66, for different tones without re-biasing the amp.
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Page 2: Table Of Contents
There is no point at which you will be waiting for the tube to receive its full current for the best sound—it always will. 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. -
Page 3: Univalve 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 UniValve will sound edgier and more aggressive. With the Attitude knob turned down, the UniValve sounds sweeter and more controlled. - Page 4 Simply unscrew the lens and replace with a #1816 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 5: Back Panel
Use a 1/4” instrument (not speaker) cable with this output. You can use this output to slave to send the UniValve’s signal to another amp (effectively using the UniValve as a preamp). You can also to send the signal directly from the line out to a mixing console or recording system. - Page 6 8. Impedance switch: This switch allows you to set your UniValve to match the impedance of your speaker cabinet. Most speaker cabinets and combinations of cabinets will use the "8 or 16 Ohm" setting. However, if you use 4 Ohm loads you will find the "2 or 4 ohm"...
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Page 7: Switching Tubes In The Univalve
You can experiment with preamp tubes in the UniValve as easily as power tubes—just pull out the current tubes and inset a new one! The UniValve can take any type of dual triode preamp tube, such as 12AX7, 12AY7, 12AU7, 12AT7, 12AZ7, 12DW7, 12BH7, ECC83, ECC82, ECC81 and more. -
Page 8: Thd Electronics Contact Information
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 UNIVALVE INSTRUCTION MANUAL...
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