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you can read all about this amp at:
Power tubes included with the amp:
1 - KT77
1 - EL34
2 - 6v6
2 - 5881
i have done a "treble modification" to this amp to tame the often noted "shrill" high end
in the photograph you will notice a 3-way mini-toggle (located on the left-hand side,
beside the 2 input jacks), that selects between a 220pf capacitor, a 68pf capacitor,
and no capacitor, according to this website:
I'm dropping the price from $550 to $425
__________________________________________________ _____________________
__________________________________________________ _____________________
Some information from the THD website (http://www.thdelectronics.com/produc...niValve.html):
>> 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. 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 1 x 12 or a 4 x 12" cabinet, yet quite small and light. It has a built-in Hot PlateŽ Power Attenuator that allows for full output distortion
at almost any volume. And it doesn't cost as much as you might think.
Controls and Features
The UniValve has two inputs: one for high gain and one for low gain ranges. The low gain input with 12AX7 preamp tubes in the amp gives a wide range
of clean sounds from "Country" clean and crisp to Jazz-direction warmth. With the controls pegged and a relatively high-output humbucker, the low-gain
input can deliver a very convincing "Texas Blues" type of overdrive. Plug into the high-gain input and you are in a whole different world from early
"British Invasion" tones to contemporary Heavy Metal sounds. The most surprising aspect to the UniValve's high-gain overdrive is that even with stunning
levels of grind, you can still play complex chords and hear every note of the chord clearly. There is none of the mush and confusion normally associated
with high-gain tones.
The controls are the traditional Volume, Treble and Bass controls along with what we call an "Attitude" control. The Attitude control is not a Presence control,
as the amplifier has no negative feedback from the output transformer back into the driver stage. The Attitude control determines how the driver stage responds
to signal and how it drives the power tube. There is also a built-in THD Hot Plate power attenuator that lets you have full output distortion at any volume level.
The Hot Plate has its own hard-bypass switch on the front panel, which completely removes it from the circuit for Full-Power playing into a speaker.
The UniValve features a lightbulb on the front panel that not only glows when the amplifier is played, but it also provides very effective noise-reduction.
For occasions when you do not want this feature, there is an On-Off switch for the light bulb circuit right on the front panel.
The UniValve has a GREAT-sounding transformer-isolated line out on the back panel complete with an adjustable level control and a switch to choose
Line-Level or Instrument-Level signal. The transformer used in the line-out was chosen for its pickup-like im-pedance and tonal characteristics. Most
amplifiers' line-outs only work well when used to drive other power amplifiers, and sound harsh and thin when plugged into the guitar input of an
amplifier. Not so with the THD UniValve! Even into the input of a Marshall 100-watt head, the UniValve provides a warm, fat, tight and sweet sound
that FEELS like an amplifier, not like a preamp-amp rig. The UniValve can drive any speaker load from 2 ohms all the way up to 16 ohms. When there
is no speaker plugged into the speaker jack, the amp uses its own built-in dummy load so no damage will occur, and to allow the silent use of the amp
for direct recording purposes when miking a cabinet is not practical.<<
Power tubes included with the amp:
1 - KT77
1 - EL34
2 - 6v6
2 - 5881
i have done a "treble modification" to this amp to tame the often noted "shrill" high end
in the photograph you will notice a 3-way mini-toggle (located on the left-hand side,
beside the 2 input jacks), that selects between a 220pf capacitor, a 68pf capacitor,
and no capacitor, according to this website:
I'm dropping the price from $550 to $425
__________________________________________________ _____________________
__________________________________________________ _____________________
Some information from the THD website (http://www.thdelectronics.com/produc...niValve.html):
>> 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. 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 1 x 12 or a 4 x 12" cabinet, yet quite small and light. It has a built-in Hot PlateŽ Power Attenuator that allows for full output distortion
at almost any volume. And it doesn't cost as much as you might think.
Controls and Features
The UniValve has two inputs: one for high gain and one for low gain ranges. The low gain input with 12AX7 preamp tubes in the amp gives a wide range
of clean sounds from "Country" clean and crisp to Jazz-direction warmth. With the controls pegged and a relatively high-output humbucker, the low-gain
input can deliver a very convincing "Texas Blues" type of overdrive. Plug into the high-gain input and you are in a whole different world from early
"British Invasion" tones to contemporary Heavy Metal sounds. The most surprising aspect to the UniValve's high-gain overdrive is that even with stunning
levels of grind, you can still play complex chords and hear every note of the chord clearly. There is none of the mush and confusion normally associated
with high-gain tones.
The controls are the traditional Volume, Treble and Bass controls along with what we call an "Attitude" control. The Attitude control is not a Presence control,
as the amplifier has no negative feedback from the output transformer back into the driver stage. The Attitude control determines how the driver stage responds
to signal and how it drives the power tube. There is also a built-in THD Hot Plate power attenuator that lets you have full output distortion at any volume level.
The Hot Plate has its own hard-bypass switch on the front panel, which completely removes it from the circuit for Full-Power playing into a speaker.
The UniValve features a lightbulb on the front panel that not only glows when the amplifier is played, but it also provides very effective noise-reduction.
For occasions when you do not want this feature, there is an On-Off switch for the light bulb circuit right on the front panel.
The UniValve has a GREAT-sounding transformer-isolated line out on the back panel complete with an adjustable level control and a switch to choose
Line-Level or Instrument-Level signal. The transformer used in the line-out was chosen for its pickup-like im-pedance and tonal characteristics. Most
amplifiers' line-outs only work well when used to drive other power amplifiers, and sound harsh and thin when plugged into the guitar input of an
amplifier. Not so with the THD UniValve! Even into the input of a Marshall 100-watt head, the UniValve provides a warm, fat, tight and sweet sound
that FEELS like an amplifier, not like a preamp-amp rig. The UniValve can drive any speaker load from 2 ohms all the way up to 16 ohms. When there
is no speaker plugged into the speaker jack, the amp uses its own built-in dummy load so no damage will occur, and to allow the silent use of the amp
for direct recording purposes when miking a cabinet is not practical.<<
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