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FDP Forum / Amp Mods, Repairs, and Projects / Fender 6G3 mod

Diverted

USA

Ted
Dec 11th, 2016 07:25 PM   Edit   Profile   Print Topic   Search Topic

HI all,
I'm in need of some help. I would like to add a negative feedback switch similar to that shown in the link below (for 5e3) in a 6g3 I am building. Could anyone help? Thanks!

https://robrobinette.com/5e3_Modifications.htm#Switched_Negative_Feedback

Ted

Roly
Contributing Member
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Whitehorse Canada

I don't get out much
Dec 11th, 2016 07:49 PM   Edit   Profile   Print Topic   Search Topic

Hi Ted

Before committing to a hole in the chassis, I would temporarily ad a SPST switch with the chassis on the bench to find out if your ears like it.
Don't really need the switch....a clip cord will work just as well.

cheers

Hammond101
Contributing Member
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So. Cal. USA

Dec 12th, 2016 09:32 AM   Edit   Profile   Print Topic   Search Topic

It sounds like you want to do exactly the opposite of what the link describes?

The 6G3 Deluxe uses a negative feedback loop by design. A 56K resistor is used. You will see a wire leading from the hot side of the output jack(s) to this resistor in the layout for this circuit. If you want more or earlier breakup increase the value. More clean do the opposite.

Since this is a build and I would assume you will be grounding with a 3 prong power cord there is no need for a ground switch. This switch or its mounting hole in the chassis can be used for your feedback selector switch.

You are walking a fine line here with resistor values. I've set up a few blackface Bassmans as above with pretty good success but it takes a bit of fiddling to get the resistor values correct for what your ears want. The switch is a good idea as the amp will be more sensitive to humbuckers as you reduce the amount of negative feedback.

I'd build the amp stock, get it running and stable then mod it if it were me. You might like it "as is".

FDP Forum / Amp Mods, Repairs, and Projects / Fender 6G3 mod




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