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davidgem1406 · 30th Jul 2019, 4:29 pm

I have been working away on this radio and making good progress.
Today the progress slipped. First I found the output transformer primary had gone O/C since removing it from the chassis.
Then I went and dropped the 349A output valve, it did not bounce.

Fortunately I had a 6V6GT available so no wiring to change about. Not that I have done any as yet, other than drawn it all up.

The question is about replacing the output transformer. I have several available that I can make fit in place of the original. However I do not know what the primary DC resistance should be.

The data sheet, page 2, for the 6V6GT states the load to be 5K with anode and screen volts at 250V.
Does that refer to the primary DC resistance of the output transformer?

My H.T. volts for the anode is 240V, and the screen is 90V.

Thanks,
Dave.

30th Jul 2019, 4:29 pm	#21
davidgem1406 Heptode Join Date: Feb 2011 Location: Sheerness, Kent, UK. Posts: 936	Re: Unknown Home Built TRF radio I have been working away on this radio and making good progress. Today the progress slipped. First I found the output transformer primary had gone O/C since removing it from the chassis. Then I went and dropped the 349A output valve, it did not bounce. Fortunately I had a 6V6GT available so no wiring to change about. Not that I have done any as yet, other than drawn it all up. The question is about replacing the output transformer. I have several available that I can make fit in place of the original. However I do not know what the primary DC resistance should be. The data sheet, page 2, for the 6V6GT states the load to be 5K with anode and screen volts at 250V. Does that refer to the primary DC resistance of the output transformer? My H.T. volts for the anode is 240V, and the screen is 90V. Thanks, Dave.