Rumble Mod Schematic?

[pedalpusher]

Anyone know where I can find one? I have one on the way and would like to see where to add a bass cut control. If not I'll have to trace it out Myself.

[JHS]

It's a stock TS w some minor mods:

Inputcap should be 100n, FB-resistor on IC1b should be 10k, 220n after the 1K before IC1b should be 100n.
That's all.

You can use the FD2 schem as basic and alter the 2 values - FB-clipping diodes are 2 1N914 on the R-Mod.

BTW:
Due to the 10k it sounds very, very trebly, way too much for my taste.
IMHO w a good T-booster like a modded LBB-1, a modded Electra-OD or similar in front of a TS will give you a better and more dynamic sound than the R-Mod.

JHS

[pedalpusher]

Thanks JHS. That should help. Any idea how the Color knob  differs from a TS tone knob? It seems more like a blend pot or something.

[JHS]

I've forgotten to write in my last answer that you must furthermore add a 5,6nF cap between pin 2 and 3 on IC1a for smoothing out the distortion and pushing the mids.

The Color-knob tone-circuit  has the same values like a stock TS.

The main difference in tone comes from the 10k FB-loop R on IC1b, thus the tone control acts more like a presence control boosting the upper mids and highs way more than in a TS with 1K FB-loop R.

The pre-R-Mod (called R-ODS) has slightly altered values for the tone control but the ODS sounds not as good as the R-Mod. If you want to try out the ODS-tone control change the 220n to 2,2uF  the 200R to 330R, the 10k FB-R to stock TS 1k, delete the 100n before IC1b and there's no 5,6n cap in the R-ODS.

JHS

[pedalpusher]

It'd be interesting to mod My OD9 to see if I can get it to sound like The RM.