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 Post subject: Vintage Fisher Studio Standard CA-800... Help?
PostPosted: Jul Thu 30, 2020 3:46 am 
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Joined: Jul Thu 30, 2020 3:37 am
Posts: 2
So.. i popped the top off my amp one day and something dropped down into the amp.. something somewhere must have shorted or grounded where it didn't need to because when it did, the left power meter (Left Analog VU Meter) Spiked and the Peak meter also spiked but the right channel didn't do anything, i heard this somewhat loud 60Hz mains hum come from the left channel, it popped and then went completely silent. behind the meters under a circuit board i found a big red resistor or transistor? (<<< I have no idea) was discolored and blackened and de-soldered itself from the board, before i did i could smell burning.. now i knew what it was.. even though it went silent, the left channel meters always spike when the relay switch clicks when the amp board turns on after pressing the power button. i removed the fuse for the left channel so i didnt have to see it pop anymore, it wont output any sound either... so what may be wrong with it internally to cause this even though i removed the bit that fell into the amp?


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 Post subject: Re: Vintage Fisher Studio Standard CA-800... Help?
PostPosted: Jul Thu 30, 2020 1:35 pm 
Member

Joined: Sep Tue 30, 2014 6:08 am
Posts: 5650
Location: Norfolk, VA
You've blown an STK Hybrid Amplifier for the left channel, it seems. Hard to find genuine replacements, as they've been long obsolete by Sanyo. Pop the strap off the STK module (mounted on the back panel) and post the number - someone here may have one.

BTW, those STK amps are VERy easy to blow. Make sure you invert your unit and give it a good shake to remove whatever was dropped inside.

_________________
Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: Vintage Fisher Studio Standard CA-800... Help?
PostPosted: Aug Sat 01, 2020 3:40 pm 
Member

Joined: Dec Wed 16, 2015 10:31 pm
Posts: 292
Location: Toronto ON
Which module is needed for this model?
There is a local store here in Toronto with Fisher branded PA-301 modules in stock.

Joe


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 Post subject: Re: Vintage Fisher Studio Standard CA-800... Help?
PostPosted: Aug Mon 03, 2020 4:52 am 
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Joined: Jul Thu 30, 2020 3:37 am
Posts: 2
Also I dont live near Toronto.. I live in the place of corn as we know is ohio :lol:


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