DHA ValveTone VT2 Dual Stage Bass

Controls

  • Level
    sets the output level of the effect to your amplifier, there is a lot of gain generated by the valves and selectable op-amp generated boost and this will overdrive the input of your guitar amplifier with ease.
  • Gain 1
    sets the level into the second stage of the valve on channel 1 and hence the level of gain. Use your volume control on your guitar to control the gain on the first stage of the valve, you will find that the ValveTone Dual Stage responses very well to this and you can control the break-up distortion like this.
  • Gain 2
    sets the level into the second stage of the valve on channel 2 and hence the level of gain on that channel. When channel 1+2 (high gain) is selected the overall gain depends on both Gain pots as Gain 1 and therefore channel 1 is always selected.
  • Clip (3 position switch)
    is a neat trick you won’t have seen before on this type of effect. In the center position (None) there is no clipping selected and the only clipping heard at higher gains is the valves soft chipping. The Si position connects two Silicon diodes to produce a harder Fuzz type clipping. The Ge position switches in 4 Germanium diodes, this is a much softer clipping, please note because the Germanium diodes reverse voltage is much lower than Silicon the volume will drop.
  • Boost Level
    control sets the level of the clean Op-amp Boost volume when the Boost switch is selected.

Various

the manual

The ValveTone Dual Stage uses two 12AX7 (ECC83) valves to generate classic pure valve tones. There are two selectable channels with a separate Gain on each, channel 1 produces low to mid gains while the foot switch selected channel 2 adds two extra valve stages to produce high gain levels. There is a true By-Pass switch plus an LED indicator for both effect on and when 1+2 is selected. The ValveTone Dual Stage is capable of producing a very wide range of gains to suit all types of playing. It is intended to be used in front of a valve amplifier, but will also work well with solid state amps or even recording set ups acting as a valve pre-amp.

The ValveTone Dual Stage has a built-in voltage doubler circuit; this generates 24V from the existing 12V power supply. The 24V is used to supply the anodes or plates of the valves, this adds more clean headroom, gain and output volume to the pedal over the standard ValveTone Dual MK2 range.

The ValveTone Dual Hi-Plate is fitted with 2.1mm external PSU adaptor for use with a 12v @ 500mA external supply but a supply of 1.2A or greater is recommended. The user should use a well regulated external supply as the better the regulation then the less the hum when at higher gain levels. If you find there is a lot of hum at high gains then the problem will be the supply is not well regulated. I have found that Switchmode supplies work well and these are standard for higher current types, so it is likely that any 12V supply over 1.25A will be a switchmode. The inner of the connector is the positive, there is reverse polarity protection so no harm will be done if you get it wrong.

Dave Hall Amps (DHA) (2007-2008)

The VT2 Dual Bass from DHA is a hand built valve Overdrive and Distortion effects pedal which uses two 12AX7EH (ECC83) preamp valves to provide true valve tone, the tone generated has to be heard to be believed! It has two gain settings which are selectable via a footswitch and there is an LED to let you know when 1+2 is selected.

The two 12AX7 valves can be seen via the vents are backlight with cool blue LEDs.

Channel 1 offers low to mid gain and the user can set up a clean setting which produces great valve fat tone. The highest settings on channel 1 will overdrive the input valve to give great valve crunch.

Channel 2 starts where channel 1 stops as it is driven by it. So it starts at crunch and ends up at very high gain. At full channel 1 gain into full channel 2 gain the gain is almost out of control and totally wild!

By using the by-pass, and the 1+2 footswitches then 3 playing settings are available.

Both channel 1 and 2 have two main modes of operation, Overdrive Distortion and Clipping (Fuzz) Distortion.

Overdrive is achieved by using all four gain stages in the two 12AX7EH valves to generate the classic valve pre-amp overdrive tone when 1+2 is selected and only two valve stages when channel 1 is selected.

There is also a Boost switch which switches in extra clean volume using a low noise op-amp, this is useful with low gain settings that still require the output volume.

The valves are run a 24V DC so valve soft clipping is generated at low signal levels and this is amplified by the op-amp to provide lots of overdrive volume.

The VT2 Dual Bass will act just like a high gain valve pre-amp when used with a modern solid state amp and it sounds fantastic with valve amps by keeping the signal path pure.

The VT2 Dual Bass will even sound great when plugged directly into a desk or a digital recording setup.

There are three other switches, Fat , Colour and Bright. Fat adds bass and gain while the Bright switch boosts the treble.

The three position (centre off) Colour switch adds two types of negative feedback to the circuit, this adds compression and gain.

There are three selectable types of Distortion:

  1. Valve overdrive - Classic preamp overdrive, Overdrive mode.
  2. Silicon Diode Clipping - Hard Clipping Fuzz.
  3. Germanium Diode Clipping - Soft Clipping Fuzz.

There is a Gain control for each channel, Boost Volume and a Master level to let you select that tone you been looking for!

There is a 2-1level control this sets the amount of overdrive generated as channel 2 drives channel 1.

There is also an i/p pad level controlon the bass version which is useful with high output pickups and active basses.

The VT2 Dual Bass runs from a 12V DC 1200mA supply via a standard 2.1mm socket.

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