04-08-2012, 04:49 PM
(04-08-2012, 10:49 AM)Geaney Wrote: I had a 10 Ohm 10 watt resistor so fitting that has done the trick. Heater volts now just around 69V and no discernible heat being generated.
Pleased to hear that changing the resistor has improved the low volts and the heat issues John, you're most welcome!
Now you have the chassis running well from a 120v supply, could I ask you to take a few current readings for me when you have the spare time?
I'd be most interested to know the HT current being drawn at the junction of the anodes of the 25Z6 rectifier and C26/C27 on the circuit diagram please. Not having my chassis up and running yet (waiting for the arrival of a NOS 25Z6) I can't as yet measure it myself.
From the service sheets I am guessing it will be in the 10 to 15 mA range depending on the volume setting. Having a 'ball-park' value from your set though would assist with the diode/resistor dropper I'm calculating to run the HT from in my set.
Regards
