Earthquaker Devices Crimson Drive 3 knob - Verified

[anders]

Manfred posted a schem of the most recent version of the Crimson Drive with an additional tone control and a NPN germanium transistor. SCHEMATIC

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[balazs.bencs]

I might give this a try, but the previous version had an annoying static noise, which I could not get rid of, let me know if it happens with this version too.

[anders]

it is now verified and sounds pretty darn good, especially with a strat. I used a MP38A for the Ge transistor and a couple of SFD112 for the Ge diodes.
This is basically a Rangmaster with the boost above full tilt sandwiched between a J Fet input buffer, clipping diodes and a simple (and subtle) treble cut tone control.

[andrea83]

I built it and it works like a charm! Very nice sound! I tried it with a oc141 and 1n34a.
Not much volume. How can I increase it? Thank you

[anders]

Hmm, I don't know, have you meassured gain and leakage of the OC141?

[andrea83]

changed transistor. now it works a lot better! thank you

[anders]

Right on!Sounds great doesn't it?

[andrea83]

Sounds more than great!  thanks!