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Echophone S-4 Help Wanted
#7

First let me say that I finally realize how the high-low voltage taps work--that is by changing the ratio between the primary and secondary. Before I couldn't see how going to the high voltage tap would decrease the transformer output.

I am testing with all tubes in. Fully loaded. But my test results have been so inconsistent that I switched to a different multimeter. The meter didn't make any difference. What I can see now is that when power is first on (Again, at 60VAC) the 245 plate voltage rises from zero to about 135 volts in a few seconds, then slowly reduces to 107 over a period of 2-3 minutes. I'm keeping it on now for 20 minutes to be sure that it stays at 107. If that stays steady, I check again at 115VAC, and if I get the expected 210v at the plate, then I'll proceed with the rest of the voltage tests, and if the radio still doesn't talk, then I go to my next issue.

That y'all so much.


Messages In This Thread
Echophone S-4 Help Wanted - by Winky Dink - 01-16-2019, 01:31 PM
RE: Echophone S-4 Help Wanted - by Steve Davis - 01-16-2019, 03:34 PM
RE: Echophone S-4 Help Wanted - by Winky Dink - 01-17-2019, 01:41 AM
RE: Echophone S-4 Help Wanted - by Steve Davis - 01-17-2019, 01:32 PM
RE: Echophone S-4 Help Wanted - by Winky Dink - 01-17-2019, 01:47 PM
RE: Echophone S-4 Help Wanted - by Phlogiston - 01-17-2019, 04:19 PM
RE: Echophone S-4 Help Wanted - by Winky Dink - 01-17-2019, 05:40 PM
RE: Echophone S-4 Help Wanted - by Winky Dink - 01-21-2019, 07:40 PM



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