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? Miss something obvious -S-38E ??

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March 1st 05, 05:14 PM

William Mutch

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William Mutch wrote:
I was listening to my most modest boatanchor, an S-38E, at the
ktichen table when it suddenly, in mid broadcast, came on with a
massive raw AC hum on the output.
By way of diagnostics I downloaded the manual and schematic from
the BAMA site.
I changed out the 3 section filter electrolytic and the cathode
bypass on the audio out tube with new, tested caps. No help.
I checked the rectifier (35W4) and all other tubes for heater to
cathode shorts on a good Hickok tube tester. Replaced the rectifer
with the best of three available. Still hummed.
Recapped all caps in primary 117 vac to dc supply and audio output
stage. Still hums massively.
I've already got more in time and parts than an S-38 is worth in
this project. Anything obvious I should have thought to look at
before I give up ??

So...did you get it fixed? Enquiring minds want to know....

jak

I've shelved the project for now. Next step would be to re-cap
the audio driver, but at least for now I'm tired of looking at
it...rather put my effort into an NC-183...more to do for full
restoration, but more radio when working properly.

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