This Week on the Breadboard: Super 65 - cb mods

[lrgaraujo]

The cutoff frequency is 4.8Khz approximately. The way I hear it, it's removing some of the harshness. In his Viceroy, Chuck has replaced the standard LPF with a variable presence control

 

[temol]

It's a very simple speaker simulation with cut around 5k.

 

[Chuck D. Bones]

I agree with Lrgaraujo & temol. It affects the tone the same way a 4x12 cab smooths out the top end, which is useful when the amp's output stage is being overdriven. We can counter some of the treble loss by turning up the TREBLE knob.

Two 1st-order filters in series makes an over-damped 2nd-order filter. "Over-damped" means that the transition from the pass-band to the stop-band is gradual.

To my ears, the output filter sounds about right in this circuit. If you think it's too dark, then disconnect one of the caps or make the caps smaller. If you want a variable PRESENCE control, then take a look at what Wampler does in the Velvet Fuzz. I don't think it's necessary here. YMMV.

 

[Brett]

Thanks for sharing @Chuck D. Bones! I had a few minutes to breadboard this today and it sounds pretty damn good! The controls can be adjusted to sound pretty neutral between affected and bypass signals, however, the tone control setup here has a very nice range. Thanks Phill for suggesting this one for a Boneyard makeover, and thank you @Chuck D. Bones for sharing your wisdom!

 

[Chuck D. Bones]

I was pleasantly surprised at how well the tone stack worked. I didn't touch that part of the circuit.

 

[szukalski]

I tried it and I liked it! A similar vein to a Honey Bee, I really enjoy it.