Delta Sigma said:Are your voltages where you want them? I assume you mean the extra current draw from the relay running off B+. If your voltages are higher than you want them, you may need to change the power supply dropping resistors. All depends on component variances, wall voltage, etc.
Phrazemaster said:I think it would help if you posted what values you are using for your resistors for each.
Phrazemaster said:You have to calculate the load the microphone would give the PSU. Not valued printed on the PCB. I don’t think you’re using the right value resistors.
I’m sorry I can’t help you calculate these but someone here can.
TillM said:Which tube do you use ?
According to that, you got a psu pcb, right ?
TillM said:Like Phrasemaster said, your voltage are the specs, when the mic is unloaded.
Did you read the same, when the mic is plugged ?