Treble Boost Circuit

[clyde]

I put a cathode cap in to boost treble, but it was a little much.  A standard anode by-pass cap mitigated it perfectly but dulled the tone when the cathode cap was out of circuit.  The solution:

[AlNewman]

Yes, that works well.  I did that on my HRD on the more gain channel with a .47 cap and I believe a 500pF.

Turned it into a lead boost.  Works kind of like a band pass filter, way more useable than what was there before.  The extra cap to ground after the plate got rid of all the nastiness.