Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: jojokeo on April 17, 2023, 01:18:13 pm

Title: Fender M-80 single 12" Schematic needed please
Post by: jojokeo on April 17, 2023, 01:18:13 pm

Hello,


I can't seem to come up with the Fender M-80 schematic. It's the single 12" combo model. On the back of the chassis there's a barcode that reads "Fender 22-5900 M80 Combo Guitar Amp". I have had it apart already but something is amiss with the Presence control. It is not designed using the OT secondary and feedback rather appears to be sort of a pseudo part of the preamp and/or leading to the Vol/Tone Controls?! Any help would be appreciated. Thanks in advance - Keo


ps - I've already soldered all apparent bad contacts, pot appears to be okay, etc...

Title: Re: Fender M-80 single 12" Schematic needed please
Post by: mresistor on April 17, 2023, 03:06:13 pm

Is this it?    https://elektrotanya.com/fender_m80_chorus_sch.pdf/download.html (https://elektrotanya.com/fender_m80_chorus_sch.pdf/download.html)

Title: Re: Fender M-80 single 12" Schematic needed please
Post by: jojokeo on April 18, 2023, 04:43:18 pm

Technically no, but I think it’s as close as I’m going to get? I was hoping to find an actual schematic (no chorus) before going in again. There’s a lot to take apart to get to the underside of the board. I guess I’ll re-check the traces all near once again, but without the schematic I have to guess which transistor or opamp is in play… (I hate guessing and hoping when repairing).
Thank you for the link!