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Topics - GOR3

#1
Amplifier Discussion / Fender London Reverb
September 08, 2021, 06:01:36 PM
I'm re-hab'ing a Fender London Reverb. The schematic states ±18VDC and ±15VDC from the low-voltage power supply. I'm measuring around ±15 and ±12, respectively, unloaded, so 3V low on all the rails. (The high-voltage supply matches the schematic at ±33). The secondary of the transformer for the low-voltage supply measures about 12-0-12VACrms, again unloaded. I don't see how that makes it to ±18VDC.
I'm wondering if ±15 and ±12 actually is normal.  That is, that after the schematic was drawn and published, Fender decided to drop the low-voltage supplies by 3 volts and just didn't update the schematic (or at least the schematic I have).  I contacted Fender for the service manual, but they demurred. I also searched the web; no joy. If you've been inside one of these things, I'd be curious what voltages you found.
Thanks,
George