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Help with a Fisher 200a

drums4reed

drums4reed

Member
Can anyone help me with this amp i don't want to make the same mistake I made in the past .I had a marantz model 2 and sold it stupid stupid stupid so I m hoping history doesn't repeat itself on this item I received what I believe is a rare Fisher amp but can't find any information on it can someone please help me with any information on this amp
 
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These are the final iteration of the original 50A amplifier design with the following differences:

1. Rectifier tubes are GZ34.

2. Output tubes are EL34.

3. Output tubes are wired for PENTODE operation.

4. A different OPT is employed that has a 70 volt secondary winding in addition to the (new) 4Ω and regular 8 and 16Ω taps.

5. Input tube is a 12AX7 instead of 12AU7, allowing original 12AU7 input stage to be eliminated.

6. Freed up 12AU7 section is now paralleled with its other half (bias regulator) to make for better regulator performance.

7. Unit is rated at 60 watts power output.

Other than these items, the circuit is still quite close to the original 50A design.

I hope this helps!

Dave
 
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