VTA-ST70 PUSH PULL EL34 AMPLIFIER
MY PERSONAL PCB REALIZED FOR ASSEMBLY A VERY POWERFULL PUSH-PULL AMPLIFIER.
VTA70 modification is newly upgraded with a CCS (constant-current-source)
in the "long-tailed" phase inverter for perfect AC phase balance,
It has an upgraded bias supply and 4 individual bias adjustments, one for each output tube.