Fender twin ceramic disc values

Chris Erbacher · From: Sausalito, California, USA

Doing a little bit of upgrading in my 135 watt twin and cant read the values on the little ceramic disc caps to order replacements...anyone know offhand what they are?

Tim Marcus · From: San Francisco, CA

you likely will not need to replace the ceramic caps, because they last forever. They do not dry out or drift like other capacitor types.

That said, you will notice a VAST tonal improvement in a fender style amp if you switch the ceramic caps in the signal path to Mica. Especially old production Mica - the new ones sound harsh. The old ones are silky smooth!

Off the top of my head:

120p for the bright switch
250p for the treble
10p across the 3M3 reverb mix resistor
500p to the reverb (peels off channel 2)

there are probably 3 ceramics in the tremolo circuit as well - you can leave those. Although its a cool mod to change them all to .02 this will slow the tremolo down

any other ceramic caps (excluding snubbers on the power diodes) should be removed. If you see them on the tube sockets, on the reverb RCA jacks, etc they are only there to supress oscillation. Cut them out and re-dress the wires if you hear oscillations - it will really bring back the tone of the amp.
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