"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

Richard
I don't know if the 45 triode is superior to a triode connected 6F6, I
was just wondering out loud at the keyboard. I know that audio
aficinianodos like 45s in class A but this is PP, B. It was a thought
that shouldn'thave made it to the keyboard, hi hi..
I took the beast to the hamfest but only found lookers and knob
twisters. Now I have the back breaking chore of bringing back to the
bench and checking the audio PP xfmr.
Hank
"Richard Knoppow" wrote in message
...

"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?


--

--
Richard Knoppow
Los Angeles
WB6KBL