01-17-2019, 04:40 PM
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.
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.
