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wkerriganoh
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Joined: Jul 13 2006 - 7:04pm
Fisher 400 Tuner not working

I am a know-nothing when it comes to stereo equipment. A friend gave me an indefinite loan of his Fisher 400 vacuum tube receiver. We love it not just for the sound, but because the tuner actually picks up stations most crappy modern equipment won't. But about two months after we got it, the tuner stopped picking up ANY signals at all. Anyone have a clue what might have broken? Is the tuning function controlled by one of those tubes?

Monty
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Re: Fisher 400 Tuner not working

You don't want to go poking around inside a tube unit. But, can you see the tubes with the unit powered up? If so, are any of them obviously dead? Any big black spots on the tops?

It's possible you simply blew a $15 tube and fuse. If you've got a high end shop in your town, they can probably diagnose the problem rather easily...for a fee.

Jan Vigne
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Re: Fisher 400 Tuner not working

In part, yes, the tuning function is controlled by those tubes. If the tuner has been is storage for awhile, the chances of a bad capacitor are more likely. Even if the tuner has been in use but not serviced lately, a bad cap is still most likely. You'll probably have to find a technician who will service tube tuners. The voltages inside a tube based tuner are lethal and not the place for someone without sufficient knowledge to be poking around.

wkerriganoh
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Re: Fisher 400 Tuner not working

Thanks. I live in a really small town and will probably have to take it to a city. Is there a web directory I can search for finding stereo repair shops?

Lamont Sanford
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Re: Fisher 400 Tuner not working


Quote:
You don't want to go poking around inside a tube unit. But, can you see the tubes with the unit powered up? If so, are any of them obviously dead? Any big black spots on the tops?

It's possible you simply blew a $15 tube and fuse. If you've got a high end shop in your town, they can probably diagnose the problem rather easily...for a fee.

I remember going to Lucky's as a child and playing around with the tube counter/cabinet. It had sockets on top so you can figure out with your dead tube which new tube to take out of the cabinet below it. Now you have to go to a high-end shop for a vacuum tube? Isn't there an old surplus or something?

Jim Tavegia
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Re: Fisher 400 Tuner not working

You might give this guy a try. De Wick Repairs

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