tone knob for a 386 amp?

[birt]

lets say a ruby. if you connect it to a big speaker it may sound to dull, if you connect it to a smaller speaker it may sound way too trebly.

is there a way you could change the tone? a potmeter somewhere? a switch with some different caps on it?

[petemoore]

First...tone controls with more than a couple passives, or that attenuates frequencies/output may need gain recovery.
 For treble attenuation, a *small value cap or caps from *signal path to ground will rolloff unwanted high end, and will not attenuate output [much]. *Experiment with values and placement points.
 check out FAQ, simple mods and tips, and AMZ's lab notebook.

[Hal]

you _could_ do the "guitar" tone control on it - with so so results.

search for any active EQ ckt.  You could probably buy for cheaper than what you can build.  (danelectro fish and chips)

g/l