Just got Fisher 800C project - need advice - PeterI - Vintage Asylum

Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

Just got Fisher 800C project - need advice

I got a working but problematic Fisher 800C receiver at our Denver 'Vintage Voltage Expo'. I got it cheap so I had no illusions about it. I could tell 2 of the 7591 power output tubes had some brown on the tops, getter flash mostly gone. When I turned on the 800 (it had been powered recently by the guy I bought it from) I saw that one of the tubes went cherry red, I turned it off immediately.
The bases of these 2 tubes were cracked from overheating. Here's the question: is the problem in the circuit, causing these tubes to act this way? Or are they just bad tubes, and I can solve that problem by putting in another pair of 7591s I have from a different Fisher amp I have? I sure don't want to damage my good Sylvania 7591s.
I plan to restore the 800. I may get one of those kits that will include some caps, diodes and other basic parts.
Can I expect good FM from this? Fisher tube tuners I worked on had mild hum I couldn't get rid of.
I would be grateful for any advice. I know this receiver has been discussed a lot here, and I am searching archives for general info.
Pete
BTW, the Vintage Voltage was huge success. Hundreds of people attended. A lot of great gear for sale, everything from antique radios to high-end used equipment. I sold three turntables, an amp, other things.

This post is made possible by the generous support of people like you and our sponsors:

Parts Connexion

Topic - Just got Fisher 800C project - need advice - PeterI 08:21:22 03/26/07 (14)

800C is working perfectly now - PeterI 21:22:16 04/06/07 (0)

Picture of 800C chassis - under - PeterI 11:00:12 03/27/07 (2)

Re: Picture of 800C chassis - under - Ron Oehlert 11:39:03 03/27/07 (1)

Thanks... - PeterI 12:17:45 03/27/07 (0)

Oh...and the FM - caffeinator 20:57:41 03/26/07 (0)

Re: Just got Fisher 800C project - need advice - smollett 20:28:55 03/26/07 (0)

Lessons from my 800B experience - caffeinator 20:07:00 03/26/07 (6)

Re: Lessons from my 800B experience - PeterI 20:20:32 03/26/07 (5)

Fisher 800C schematic - Flatmap 21:22:14 03/26/07 (3)

Re: Fisher 800C schematic - PeterI 06:35:49 03/27/07 (2)

Re: Fisher 800C schematic - Tom Bavis 08:34:10 03/27/07 (1)

Re: Fisher 800C schematic - PeterI 08:54:52 03/27/07 (0)

Re: Lessons from my 800B experience - caffeinator 20:32:26 03/26/07 (0)

If it is problematic, it aint workin' - Ron Oehlert 09:43:12 03/26/07 (0)

You can not post to an archived thread.