by ecca » Wed Apr 19, 2017 4:27 pm
Hallo Tonio.
It's a 2 valve pre-amp - but different valves to what I normally use, they''re pentodes.
There is no transformer to generate the HT, I used an inverter so that any 12 volt power supply can be used, AC or DC, polarity is irrelevant.
The 2 input and output level controls are fitted in a twin concentric pair of potentiometers.
I found and fitted a decent rotary BCD switch instead of the usual thumbwheel.
Apart from that it's a normal eTap 2HW inside a pretty wooden casing.