"Henry Kolesnik" wrote in
message ...
Rich
45s don't need DC for the filament...
They have been working fine on AC for years!
Hank
Well, an ancient RCA tube handbook does list the 45 as
being for AC operated sets. It needs a center tapped
filiment transformer for cathode return although it could be
done with a center tapped resistor across the filiment. The
45 (AKA RCA UV-245) was an old and obsolete design when the
Super Pro was designed. Why do you think this tube is
superior to trioded connected 6F6's?


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Richard Knoppow
Los Angeles
WB6KBL