DHA ValveTone VT1 Acoustic Preamp


  • Level
    sets the output level of the pre-amp to your amplifier, desk or digital recording set up.
  • Gain
    sets the level into the second stage of the valve and hence the level of gain. Use the gain control on your guitar to control the gain on the first stage of the valve, you will find that the ValveTone 1 Acoustic responses very well to this and you can control the very soft valve break-up distortion like this.


the manual

The ValveTone 1 Acoustic uses a single 12AX7 (ECC83) valve to generate classic pure valve tones. The ValveTone 1 Acoustic is a low gain effect and is intended to be used to warm up the tone of an electro acoustic guitar but it will also work well with a microphone for vocals or recording.

The ValveTone 1 Acoustic is fitted with 2.1mm external PSU adaptor for use with a 12v @ 1200mA external supply. The user should use a well regulated external supply as the better the regulation then the less the hum when at higher gain levels. The inner of the connector is the positive, there is reverse polarity protection so no harm will be done if you get it wrong. There is an internal switch mode power supply which doubles the 12V to 24V for the valve anodes or ‘plates'.

The effect is always on when the power is connected and there is an LED to show you when the power is present.

There is a very clean op-amp boost circuit in the effect which helps get the required line levels of output when operating at very low levels of gain. There is a small black pre-set inside the effect which adjusts the boost level, you can adjust this to suit your set up. You are safe to adjust the pre-set when the effect is powered up as the voltages inside are very low.

Dave Hall Amps (DHA) (2008)

The VT1 - Acoustic from DHA is a hand built valve Pre-amp which uses a 12AX7 (ECC83) pre-amp valve to provide true valve tone, the tone generated has to be heard to be believed!

The VT1-Acoustic is suited to electro acoustic guitarists looking for a subtle fat and warm valve tone. There is just a hint of softclipping distortion when the gain is turned up a bit which adds the warm tone that only valves can produce.

The valve tone generated by this effect is great with modern solid state amps and fantastic with valve amps. The VT1-Acoustic will even sound great when plugged directly into a desk or a digital recording setup.

The Gain and Level controls let you select that tone you been looking for! And don't forget the volume and tone on your guitar which will react well with the VT1-Acoustic just like a real valve amp.

The effect is always on and there is a power on LED.

The tone is pure valve, fat and warm and completely different to silicon effects pedals which tend to fizz and compress the signal.

The VT1-Acoustic runs from a 9-12V DC 1200mA supply via a standard 2.1mm socket, there is an internal switch mode power supply which generates the 24V Plate voltage.

The VT1-Acoustic is totally hand built using a quality PCB and point to point methods, even the box is hand painted. There is a one year return to manufacturer guarantee which covers parts and labour in case of failure with each unit. There is also a user manual.

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