AMZ-FX
Well-known member
I've now had a chance to look at the Vox Cooltron pedals.... there is no trick to it.
It is a grounded cathode 12AU7 with the triodes paralleled and an opamp servo providing
a voltage to the grids for bias. The heater is powered from a 3.3v regulator. The B+ is 6volts.
The pedal has 4 x AA bateries in it.
The batteries drive the 3.3v regulator which in turn feeds the 6v step-up regulator, that
also generates -6v for the opamps.
regards, Jack
It is a grounded cathode 12AU7 with the triodes paralleled and an opamp servo providing
a voltage to the grids for bias. The heater is powered from a 3.3v regulator. The B+ is 6volts.
The pedal has 4 x AA bateries in it.
The batteries drive the 3.3v regulator which in turn feeds the 6v step-up regulator, that
also generates -6v for the opamps.
regards, Jack