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City: Linn Creek, MO
No, go ahead and check the voltages, especially the plate voltages on the 24s and the 27. If there is no plate voltage on one of the 24s, there is an open winding in one of the RF transformers. If there is no plate voltage on the 27, the interstage transformer has an open primary winding (a common failure). If all the tubes light up, go on the assumption that they are good, at least good enough for the radio to work. You said the radio hums, that tells us the 71s and the 80 are working.
Steve
M R Radios C M Tubes
Messages In This Thread
RE: Philco Model 20 Lowboy - by Steve Davis - 05-06-2017, 11:01 PM
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New Philco Repair Bench
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| I am sure this is the archive, and not the Chuck's site.morzh — 09:50 PM |
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Made mistake & did not label connection
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| It's not like we are good friends with that wire and can tell it from other ptetty identical looking wires.
Why'n't you...morzh — 09:49 PM |
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Made mistake & did not label connection
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| I'm not sure why that wire wasn't covered in the video. I'm pretty sure the 6A8 won't work until that pin is grounded. Y...RodB — 09:47 PM |
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Made mistake & did not label connection
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| You'll have to forgive me, I am not sure what you mean. Can you explain what you are really saying. If anyone does not...georgetownjohn — 08:05 PM |
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Made mistake & did not label connection
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| Those are details better left to the ones who know. Maybe you disconnected the wrong end of the wire.RodB — 06:22 PM |
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Made mistake & did not label connection
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| Maybe this is starting to make some sense in my hard head. Is this why the wire in question was not in the great Ron Ra...georgetownjohn — 04:34 PM |
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Made mistake & did not label connection
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| I was correct with the 6A8 pin connection's, 7 and 8 are connected to ground as well as the tube shield (the broken line...RodB — 02:41 PM |
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Made mistake & did not label connection
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| What does the dotted line representing that surrounds the tube in the schematic?georgetownjohn — 02:17 PM |
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Made mistake & did not label connection
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| Hello John,
I have been there either label got lost or was not labeled !
Sincerely Richardradiorich — 02:15 PM |
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Made mistake & did not label connection
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| Sorry, it is a Philco 37-640. Does that help?--Johngeorgetownjohn — 02:14 PM |
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