Posts: 62
Threads: 5
Joined: Apr 2021
City: CLARKSTON
State, Province, Country: MI
Well...the power chassis is a mess. The interstage transformer has an open primary, one choke is open, and the AVC 6J5 is broken. Theory that I have is the filter cap shorted, which caused excessive current through the choke, which burned out. This is on the side with the candohm voltage divider resistors; if the choke goes open, no current flows, which means no bias voltage source. As the 6F6 driver is fixed bias and fed from the other power transformer, no bias caused excessive plate current, which burned out the interstage primary winding. Oh, well.....
Messages In This Thread
RE: 38-690 Code 125 - by RGK20m3 - 12-02-2021, 07:35 PM
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Recent Posts
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Need to purchase some accessories for restoration of my Old Philco Radio
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| Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM |
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First Radio restoration
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| Hi Tubeman,
Welcome to the Philco Phorum. Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM |
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First Radio restoration
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| You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM |
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Zenith H725
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| Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately.
More ...EdHolland — 10:18 AM |
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Graphics for majestic 1050 dial glass.
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| Murf;
I found this thread on the ARF, the first photo has a pretty good view of the dial glass.
Regards
ArranArran — 01:12 AM |
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Zenith H725
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| hello Ed,
how about that speacial tape used for ducting it's like foil or how about thin piece of
aluminum roof flash...radiorich — 12:19 AM |
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Zenith H725
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| Ed;
One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM |
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Zenith H725
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| I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM |
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Zenith H725
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| The PSU filter cap arrived today (thank you USPS!) so I will work on that later.
Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM |
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Philco 610B oscillator wiring
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| Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM |
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