Hi to all, I'm new to this forum.
Some years ago I purchased an used Dynaco ST-70 kit.
A few month ago I replaced the old selenium rectifier
for 1N4007,470uF.100V,10K resistors.
On the PC-3 installed new resistors,new orange drop 715P/600V capacitors,new sovtek 7199,the EL-34's and the rectifier tube GZ-34 are good.
The problem I have now is that I can not adjust the
bias on the left output, the digital meter reads 2.5V
with the pot turned counterclockwise,if I turn it clockwise the meter gives me more than 3 volts.
The right output is adjustable to 1.56 or less.
Voltage test points on can cap A=278V, B=348V, C=418V and
D=418V.
I appreciate your help and thanks in advance.
.
albert.
Some years ago I purchased an used Dynaco ST-70 kit.
A few month ago I replaced the old selenium rectifier
for 1N4007,470uF.100V,10K resistors.
On the PC-3 installed new resistors,new orange drop 715P/600V capacitors,new sovtek 7199,the EL-34's and the rectifier tube GZ-34 are good.
The problem I have now is that I can not adjust the
bias on the left output, the digital meter reads 2.5V
with the pot turned counterclockwise,if I turn it clockwise the meter gives me more than 3 volts.
The right output is adjustable to 1.56 or less.
Voltage test points on can cap A=278V, B=348V, C=418V and
D=418V.
I appreciate your help and thanks in advance.
.
albert.
