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City: Menlo Park
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So - a little data. I measure our line voltage this morning. assuming my multimeter is accurate, mains in is running around 123 - 124 Volts. That is quite an increase from 117 V.. I measured line current at 0.77 A, and that remained stable over a good period of operation. So this tells us a total power ~94W.
Poking around the audio amplifier chassis suggested the HT was not so far out of spec for the service sheets I have. Voltage on the 6V6 cathodes (self bias arrangement) was 12 V where 15 V is called, so these may be running a little hot, but I need to get the grid voltages as well for the full picture.
I'll do some calculations and try a bucking transformer next time we are here. I should also get a variac, as I've become sucked in to this ancient electronics business for good 
I don't hold with furniture that talks.
Messages In This Thread
RE: Zenith 12H090 - by EdHolland - 05-26-2019, 09:22 PM
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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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| 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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| 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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| 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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| 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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| 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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Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM |
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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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