Hello!
I just finish today my ST-35 amplifier!
It work very nice for a couple of hours, then I lost the left channel!!! So I recheck everything and find this voltage on V2:
Pin#1 271v
Pin#2 50v
Pin#3 65v
Pin#6 227v
Pin#8 120v
So, for me, 12AU7 is broken! I am lucky, I have an other tube at home!
I replace the tube and averything come to normal! I have every good voltage.
So, after a couple hour again, I ear a very strong distortion on right channel... I put off the amp... Recheck the voltage, I have bad voltage value on 12AU7..
Also, I notice when the amp was working good, the 12AU7 bright more than the 12AX7, it is normal?
Where is my amp problem?