Forgive me if this has been beat to death already... I have been resurrecting a number of 30's vintage radio receivers lately. Hallicrafters SX-18, National NC-44 and NC-46, etc. I notice that they a
OK, answered my own question by reading some spec sheets. I can run the 6F6 with 250V on the screen. The limit on my 813 is 600V on the screen and about 300ma cathode current. So, it will work but it
Hello Bob, If you frequent hamfests, you can find some good buys on tubes. I purchased a 4-1000 a year ago for $25.00. I purchased an RF deck from a ship radio with a pair of 813's for $25.00. So if
No, for multiple reasons. The list would be a long one. Not a chance of that working, unless you run a tube that has a darned low operating impedance and yet has insignificant output capacitance. Mi
Microwave ovens are certainly a great salvage opportunity. I have done several sucessful low voltage rewinds/modifications to the UK 240V 600W variety of transformer. For reduced voltage the hv secon