UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Hallicrafters SX-25 Rebuild: New Mains Transformer Questions.

mrrstrat · 14th Oct 2020, 7:26 pm

The best info I was ever able to find was that the Type 80 cathode voltage ranges from 200-350 volts. I am at 285VDC or about 80% of what the max is supposed to be.

I cannot verify that the "nominal" voltage is 275VDC, nor the working range is +/-75VDC as I have found no concrete documentation of what nominals should be. Perhaps there is a Sams Photofact out there yet to be discovered for the SX-25.

I can say that my set is operating with 285VDC at the Type 80 cathode under load and is working great.

14th Oct 2020, 7:26 pm	#17
mrrstrat Pentode Join Date: Jul 2020 Location: Rockford, Illinois, USA. Posts: 159	Re: Hallicrafters SX-25 Rebuild: New Mains Transformer Questions. The best info I was ever able to find was that the Type 80 cathode voltage ranges from 200-350 volts. I am at 285VDC or about 80% of what the max is supposed to be. I cannot verify that the "nominal" voltage is 275VDC, nor the working range is +/-75VDC as I have found no concrete documentation of what nominals should be. Perhaps there is a Sams Photofact out there yet to be discovered for the SX-25. I can say that my set is operating with 285VDC at the Type 80 cathode under load and is working great.