garnet presence

[Andy Le Blanc]

Here's a interesting tone tweeker, I found it in a Garnet schematic.

I think it can be played with in any inverter with a bias resistor.

[BTF]

Years ago I copped a similar treble boost circuit from a Garnet for a conversion I was doing to a Knight PA amplifier to convert it to a rack power amp. I used a dual-ganged 1M pot and changed the rear carbon wafer to a 2K (the Garnet used the dual 1M)- one of the wonderful things about CTS pot construction. The front (1M) pot was a standard tone cut control a la the early Fender tweeds with a .0047uF cap to ground. The rear pot dials in a .47uF cathode bypass cap on the second triode's cathode resistor. It's very smooth and works wonderfully.

I've never seen a Garnet in person, but I understand they were very well thought-out.

Regards!

[Tone Lover]

Andy is that a .047 with a 50k pot its hard to read your fast writting.
Thanks Bill

[jhaas]

I think this is what Andy is referring to. It's a portion of the Garnet G100 Deputy schematic.

[Andy Le Blanc]

Nope...

I found it in a schematic of a G200R ENFORCER

But that's why I posted, its on the inverter as a presence control and not
in the pre-stages, I've see various controls on the bypass caps in many places,
but not on the inverter... looked like a neat idea, hadn't seen it else where.

Yep... .047 and 50K

[Tone Lover]

Cool, thats a very interesting idea I will have to dig up that schematic.
thanks Andy

[ChrisM]

Might be cool to try in a Fender 5E3 Deluxe with the same style PI.