Hey everyone, I recently picked up a pair of Fisher 80-C mono preamplifiers and since there is not much info out there on them, I though I would post the rebuild. Both of these preamps have the much harder to find red lettering on the faceplate, instead of the black. I believe the red faceplates were earlier models, but I am not certain. Both serial numbers start with "15". The one with the cabinet was purchased here on AK, and the other was purchased locally.
One unit is completely original, and the second one just has one of the multisection capacitors replaced (its taller than the original can). To my surprise, both of these units run great, no hum or buzz, but they will still be checked out so they are safe to use. Multi-section capacitors will be replaced, most likely with new cans from hayseed hamfest. The selenium rectifier and bridge rectifier will be replaced with modern 1n4007 diodes, and all resistors and capacitors will be checked. More to come soon!
Link to manual: http://vintagevacuumaudio.com/schematics-manuals/fisher/fisher-80-c-service-manual-schematics.pdf
One unit is completely original, and the second one just has one of the multisection capacitors replaced (its taller than the original can). To my surprise, both of these units run great, no hum or buzz, but they will still be checked out so they are safe to use. Multi-section capacitors will be replaced, most likely with new cans from hayseed hamfest. The selenium rectifier and bridge rectifier will be replaced with modern 1n4007 diodes, and all resistors and capacitors will be checked. More to come soon!
Link to manual: http://vintagevacuumaudio.com/schematics-manuals/fisher/fisher-80-c-service-manual-schematics.pdf
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