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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: fisher 400 troubleshooting/repair posted by mattk on December 21, 2004 at 07:01:34:
(...with identically one Fisher 400 restoration under my belt!)Is the low level/distortion heard with all inputs?
You can try injecting a line-level input into the power amp input at the "spatial expander" jumpers and perhaps isolate the problem to the pre or power amp.Problem could be coupling caps (anywhere, not just the ones to the outputs) or plate resistors, for example.
Is the (fixed) bias OK? Any of the 7868's plates glowing red?
Just out of curiosity, do you know if your 400 has selenium or silicon rectifiers? Both flavors of 400 do exist, as these receivers were made for quite a few years.
There are MANY here more expert in matters Fisher than I, but I am in Boston MetroWest and would be HAPPY to take a look at it sometime mutually convenient if you'd like. I am most assuredly NOT a professional... I do like to experience these nice old receivers vicariously, though, so always happy to help if I can. I have most of the tools of the service trade, and I even know how to use some of them :-) I also do have some scanned Fisher schematics and manual pages that may be helpful, too.
Send me an e-mail if you're interested.
all the best,
mrh
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Follow Ups
- speaking as a seasoned Fisher restorer :-) ... - mhardy6647 07:30:54 12/21/04 (0)
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