Ok, so Im sitting here with a Fender Studio Bass amp and I'm getting ~530V plate voltage (should be 500V) and my cheap chinese 6L6GCs have great problems with that.
It seems that the power transformer is already set to its highest input voltage, and that was probably sufficient in 1980 with 220V, today we have 230-240 here in Germany.
The 39K/2W resistors (see attached schematic) direct after the rectifier bridge measure 43 & 47K.
It's slightly too high, could that be a part of the problem?
Any ideas out there how to get down the plate voltage?
Use lower values on the 39K resistors, Zener string from bridge minus to ground?
I have a couple of old Fender 6L6GCs (STR 387) who doesn't mind the 530 volts but this amp needs 6 of them and I'd rather look for cheaper altrenatives + be kind to the caps as well... 8)
Thanks in advance!
It seems that the power transformer is already set to its highest input voltage, and that was probably sufficient in 1980 with 220V, today we have 230-240 here in Germany.
The 39K/2W resistors (see attached schematic) direct after the rectifier bridge measure 43 & 47K.
It's slightly too high, could that be a part of the problem?
Any ideas out there how to get down the plate voltage?
Use lower values on the 39K resistors, Zener string from bridge minus to ground?
I have a couple of old Fender 6L6GCs (STR 387) who doesn't mind the 530 volts but this amp needs 6 of them and I'd rather look for cheaper altrenatives + be kind to the caps as well... 8)
Thanks in advance!