WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
hie there
my name is john
can you help I have a SD3 4 box preamp could do with
schematics it wos built by peter bruty is there any one out there hoo might be
able to help
kind regards
john