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FDP Forum / Amp Mods, Repairs, and Projects / How do I make this boost mod footswitchable?

Figaro
Contributing Member
*

South Carolina

I kicked cancer's ass!
Jan 30th, 2011 09:42 PM   Edit   Profile   Print Topic   Search Topic

I like the mod that removes the tone stack in a Fender for a gain boost, but how can I make this mod footswitchable?

jhundt

Netherlands

Jan 30th, 2011 10:25 PM   Edit   Profile   Print Topic   Search Topic

I did it on my PR II. I disconnected the ground on the mid pot. (On an amp w/o mid you would disconnect the 6800 mid resistor). Run a wire from that point to a footswitch jack. If the footswitch is open, the ground will be lifted. If the footswitch is closed, the ground will be restored.

On an amp w/ no mid control you can mount the mid resistor on either end of that wire ( at the pot or at the jack). Use a footswitch with shielded wire and try to keep it short so you don't pick up any buzz.

Figaro
Contributing Member
*

South Carolina

I kicked cancer's ass!
Jan 31st, 2011 11:33 AM   Edit   Profile   Print Topic   Search Topic

Thanks! And I guess I could also install a resistor, maybe 50K to 220K to fine tune the amount of boost?

dr.weirdbeard

NS Canada

Jan 31st, 2011 12:06 PM   Edit   Profile   Print Topic   Search Topic

Put in a pot wired as a variable resistor between the mid pot/resistor ground and it's ground connection, then make the footswitch short across the terminals of that pot - when the footswitch is off, the new pot sets the boost level. With the f/s on, the amp plays as stock.
I've got the same setup on an amp I'm working on at the moment, and I've found a 10K pot wasn't enough to get much of a boost - I'm going to a 100KA pot for the boost control. Just lifting the ground of the stack isn't really controllable enough to be useful, IMO. And the amount of boost needed varies considerably depending on the guitar and everything else in the chain...

Figaro
Contributing Member
*

South Carolina

I kicked cancer's ass!
Jan 31st, 2011 05:40 PM   Edit   Profile   Print Topic   Search Topic

Great idea dr.weirdbeard to make it adjustable as well as switchable. I've been using a 250K pot for a Mid/raw control for years, but the 250K has always a little too much. A 100K may be the best value to use.

jhundt

Netherlands

Feb 1st, 2011 09:46 AM   Edit   Profile   Print Topic   Search Topic

great and simple idea mr weirdbeard; maybe I'm gonna rewire mine that way.

Figaro - I put in a 250k pot on my Princeton Reverb - as you suggested when we PMed over on the TDPRI. It works very nicely; I measured the resistance and found that 6.8k (the standard mid resistor) was about 3.5 on the knob, so now I can dial in a mid cut or progressively lift the ground for the boost.

I think you and me must be on the same amp wavelength - you seem to be on every thread that catches my eye!

dr.weirdbeard

NS Canada

Feb 2nd, 2011 03:31 AM   Edit   Profile   Print Topic   Search Topic

I also mark the 6.8K point on my mid knobs (which are also 100KA) with a small paint dot on the amp faceplate (no, not vintage amps) so that I know where the setting is compared to 'non-mid' tone stacks... same idea as you, jhundt, just can't remember the number on the knob if I don't...

Steve Dallman
Contributing Member
****

Merrill, Wisconsin

Finally! Decent cold and snow!
Feb 2nd, 2011 07:58 AM   Edit   Profile   Print Topic   Search Topic

A mod I used to make to my bass amps and preamps that used passive tone stacks, was to add a jack, as you are talking about, and use a volume pedal in which I put a 50k pot. Midrange/boost on a volume pedal. Roll it back for most of the night, but rock it forward for more punch and presence.

jhundt

Netherlands

Feb 2nd, 2011 09:07 AM   Edit   Profile   Print Topic   Search Topic

yet another superb idea, thank you very much Mr Dallman.

Figaro
Contributing Member
*

South Carolina

I kicked cancer's ass!
Feb 6th, 2011 07:18 PM   Edit   Profile   Print Topic   Search Topic

Steve, I really want to try this midrange/boost in a volume pedal. What kind of volume pedal will work?

Steve Dallman
Contributing Member
****

Merrill, Wisconsin

Finally! Decent cold and snow!
Feb 9th, 2011 04:47 PM   Edit   Profile   Print Topic   Search Topic

I took a standard volume pedal, and replaced the pot with a 50k audio taper pot. I plugged a mono cord from the pedal's output. That jack has the center leg of the pot connected to the hot terminal.

I turned the mid pot down on my amp, and used the pedal to control the mids. A 50K pot allowed going beyond what the control would do, which lifts the Fender type tone stack off ground, raising first mids, then all frequencies and ends up boosting as you go up.

FDP Forum / Amp Mods, Repairs, and Projects / How do I make this boost mod footswitchable?




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