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OK, while touching grids, I realized the buzz stops at 1st Det, checked the voltage at K, was 54V. Too much.
The cathode flexible resistor 2kOhm was opened.
Changed it.
Now it is normally receiving BC band and at two SW bands.
The last one does not get anything...but then I just looked at the dial, it is 1.5MC to 4.5MC...I am not even sure it is supposed to get anything.
Anyways, I will attempt the alignment tomorrow, this will show if the band is working.
But.....I wasn't hoping it would sing today, so.....nice end for the day.
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RE: AK808A - by morzh - 12-07-2014, 12:36 AM
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Philco Model 38-7: what caps & resistors do fail typically?
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Hello Martin,
Welcome aboard our little community what great Model 38-7
Sincerely Richardradiorich — 12:30 AM |
Philco Model 38-7: what caps & resistors do fail typically?
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Welcome to the Phorum Martin.
I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM |
Part numbers to model cross
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Jim,
We have this index put together by Dale Cook but I don't think that is quite what you are looking for.
The Parts...klondike98 — 09:37 PM |
Philco Model 38-7: what caps & resistors do fail typically?
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Yep the dim bulb test is OK but I'd definitely replace all those electrolytics before I did it. Since those #47 conden...klondike98 — 09:18 PM |
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The resistor is a 2.2 Meg, it was the last one I hadn't replaced. The broadcast is coming in after replacing it.osanders0311 — 09:09 PM |
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What does the resistor measure? I think it should be 3.3 Meg.
If the oscillator coil has continuity and the resistanc...RodB — 09:03 PM |
Philco Model 38-7: what caps & resistors do fail typically?
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Good idea to check the coils... then I'll get hold of an incadescent light bulb and see what happens when the unit is sw...Musaeum — 08:49 PM |
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I have that same set, ain't too much shortwave I like anyway.....it is a good AM DX set. PaulPaul Philco322 — 08:32 PM |
Philco Model 38-7: what caps & resistors do fail typically?
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Welcome to the Phorum, Martin! Open a new thread in Philco Electronic Restoration when you begin working on your 38-7. ...GarySP — 08:28 PM |
Philco Model 38-7: what caps & resistors do fail typically?
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Welcome to the Phorum!
:wave:
Here's the schematic for that radio from our digital library:
Something to do bef...klondike98 — 08:05 PM |
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