Quote:
Originally Posted by Station X
I agree that the disc is correctly placed for a 245V supply. I was just wondering whether the wire links within the disc itself were correctly placed.
WITH THE VALVES OUT, you could check the heater voltages with the disc set to 220V and 200V to see if they are higher.
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Well here's an interesting result!
At 245V I get 2-3V AC and 5 VAC across the heaters of AZ31 and EBL21
At 220V I get 3V AC and 6 VAC
At 200V I get 3-4 VAC and 6 VAC which matches the valve specs
So I do seem to get a higher transformer output when a lower voltage is supplied
I moved the disc to 145V and something made a vibrating/humming noise so I pulled it straight out (same for 125V and 110V)
With the 200V disc setting giving me valve spec values I checked for HT output from the EBL21 anode (pin 2 to chassis) but ZERO HT DC voltage :-(. The valves are illuminating nicely at this 200V setting - in all cases though the rectifier is much less bright than the other (I guess to be expected because heaters are only powered by 4 not 6 V AC.)