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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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Recent Posts
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Philco model 38 code 121 not receiving signal.
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| Thankyou for the kind words sir.
I double checked it with my component tester and it read 2.7 ohms at .02mH.Stormlord5500 — 08:14 AM |
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PT 6 chassis screws size???
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| Hello bridKarl,
that sounds right or maybe 8/32 .
Sincerely Richardradiorich — 01:00 AM |
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PT 6 chassis screws size???
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| Have this done except for missing chassis screws.
It looks like 1 inch 6/32 sheet metal screw may work but can anyone s...bridkarl — 10:32 PM |
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Philco model 38 code 121 not receiving signal.
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| Hello Stormlord,
Well done on rewinding that coil it turned fairly good for your first one.
Sincerely Richardradiorich — 09:12 PM |
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Philco model 38 code 121 not receiving signal.
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| Well here it is. It ain't pretty, but hopefully it'll work.
I checked it with my DMM on continuity and it keeps and r...Stormlord5500 — 08:56 PM |
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Philco 42-345 Restoration/Repair
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| Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM |
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Philco 42-345 Restoration/Repair
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| Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM |
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Philco model 38 code 121 not receiving signal.
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| Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM |
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Testing a speaker and output transformer Trutone A2-G
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| The equivalent of one short turn is basically the same as that of a shorted load.
If it is the primary's turn, then the ...morzh — 03:53 PM |
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Testing a speaker and output transformer Trutone A2-G
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| I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM |
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