Author Topic: Fisher series 50  (Read 2692 times)

Mel Layrisson

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Fisher series 50
« on: September 10, 2019, 09:57:33 AM »
Is there any info on this record player amp from 1955?

Bill

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Re: Fisher series 50
« Reply #1 on: September 10, 2019, 08:09:46 PM »
Did you try Google to see what popped up?

Bill

cheddarbob388

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Re: Fisher series 50
« Reply #2 on: September 11, 2019, 02:41:23 AM »
with out doing any searching, just from the picture, I would say its a Mono amplifier, Approx. 15-20W rms out, and because its fisher, it will probably sing once its cleaned up. The power output is speculation due to there being two EL84 tubes, most likely in push pull.

All just a guess, Like Bill said, Google is a great place to start, but we love to help with advice and pointers on restoration.... and we love pictures


Mel Layrisson

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Re: Fisher series 50
« Reply #3 on: September 12, 2019, 06:33:10 PM »
Found the schematic on it

cheddarbob388

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Re: Fisher series 50
« Reply #4 on: September 13, 2019, 02:17:43 AM »
A parts list is a good start, replace the filter caps first, fisher used pretty high quality components, so they are likely still in good enough shape to keep it running, but replacing them is good insurance

cheddarbob388

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Re: Fisher series 50
« Reply #5 on: September 13, 2019, 02:19:54 AM »
And if you aren

Mel Layrisson

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Re: Fisher series 50
« Reply #6 on: September 16, 2019, 08:54:22 AM »
Just purchased all sprague Orange drops.
Going to give it a lot of love.

cheddarbob388

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Re: Fisher series 50
« Reply #7 on: September 16, 2019, 04:44:11 PM »
Just purchased all sprague Orange drops.
Going to give it a lot of love.

When I mentioned filter caps, was talking about the power supply filter, unless the couplers are wax, usually no need to replace them. The orange drops are good, but an un necessary expense. I would focus on the electrolytics first, as those tend to leak and drift much much more over the years.

TC Chris

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Re: Fisher series 50
« Reply #8 on: September 16, 2019, 09:24:50 PM »
I often replace the old paper caps because when they fail, they can take things with them.  My first experience was on an old Harmony guitar amp, a curbside find, that had glowing-red 6V6 plates.  I kinda figured out that maybe the bias was off... and maybe it was the coupling caps.  So I replaced them and bingo, no more red glow.  And the output transformer didn't die.  Caps are cheap (and better than the originals) and easier to afford than new output transformers.

Chris Campbell

cheddarbob388

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Re: Fisher series 50
« Reply #9 on: September 17, 2019, 02:28:01 AM »
I often replace the old paper caps because when they fail, they can take things with them.  My first experience was on an old Harmony guitar amp, a curbside find, that had glowing-red 6V6 plates.  I kinda figured out that maybe the bias was off... and maybe it was the coupling caps.  So I replaced them and bingo, no more red glow.  And the output transformer didn't die.  Caps are cheap (and better than the originals) and easier to afford than new output transformers.

Chris Campbell

yes, the wax paper caps need to be replaced, I usually just use the generic red polypropylene caps (you wont find a difference from the orange drops, including reliability), match the values as close as I can. I tend to do the same with the ones in plastic too, and unless its failed, i tend to leave the ceramic discs alone. Always, always always replace all the electrolytic caps, if they are still good, they wont be for long, they are 60 years old, its not a matter of if, but when they will fail 

Bill

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Re: Fisher series 50
« Reply #10 on: September 17, 2019, 06:23:05 AM »
And, if it does not already have one, be sure to install a fuse.

Bill

Mel Layrisson

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Re: Fisher series 50
« Reply #11 on: September 26, 2019, 08:10:21 AM »
Replaced all the caps the sound is so strong wow this thing is amazing.