dark and dirty boost for a 1590a

[bobodechimp]

looking for a good dark and dirty boost to fit a 1590a that is well suited for bass getar. two knobs would be best so i can get that good and dirty sound with out overloading my solid-state amp. any suggestions?

[teej212]

devi ever dark boost might do the trick.

[bobodechimp]

i was thinking that. but i do want to put it in a 1509a and i am a cheap bastard so i don't what to drop the 30 bucks for the kit only to ditch the pcb ya dig.

[Earthscum]

You could try this if you have the parts. Worked great on bass for me. I think I used an MPF102 for the second fet, though. You may try trimmers in place of the 10k's. It was biasing about 4.5-5.5V at the Emitter. I was digging on about 5.5. You can also use 1N4148's for the diodes, just check your bias and adjust the resistor (10k's).

[bobodechimp]

do you have a larger copy of that. my eyes are just so so so i need to zoom to see but it gets a little blurry. or if you could just tell me what is written under the fets on the scimatic.

[Earthscum]

Sorry about that... try this



And if I recall, I also did this with MPF102's and was digging on the results, though not as much dirty gain available. I think I used 1n4148's in that, though, and you would have to adjust the resistor a bit.

You may try 100k trimmers in place of the 10k's and bias it to half voltage or by ear. If you use MPF102's, you could use 10k trimmers, probably.