[ORAWA01]

Thank you for your clarification, snowman and Graham.
I should have read the manual for the info. I was being lazy. Sorry.

Yes, the PSU output voltage seems all around very high, and indeed last night the rig went mute. I mean no sound on reception. Not even hash noise. Just total silence. All the valves are lighting.

The Power Supply has dual voltage switch 230V and 115V. It had been used with 230V, and our mains voltage is 237V.

I am trying to reduce the pin3 voltage -107V to nominal -80V by inserting a resistor inline.

From ohms law, V=IR, current in the pin is 10mA, so this is how I was thinking, could you please confirm it is right? Or totally wrong?

The amount voltage I want reduce is, about 27V from 107 - 80 = 27V. Let say 30V. From ohms law, V=IR.

30= 0.01A (the pin 3 current is 10mA) x R
R = 30 / 0.01
R = 300
300 ohms?

Would 300 ohms resistor serially inline to the pin3, bring the voltage to -80V?

Thanks