ALPHA DOG Question. [ANSWERED]

[blearyeyes]

Will subbing R2 and R3 with 2M instead of 2.2M create any issue?
I looks like a voltage divider to provide bias to the circuit?

[mauman]

No issue at all, just a tiny reduction in input impedance that you won't notice.

[blearyeyes]

Ah.. I didn’t think about that. Interesting. Somewhere I heard the input impedance is a conglomerate of sorts so I see how that would affect it. I went ahead and made a couple of teepees. Now the LM308 I have, from who knows where/when, is not acting like the YouTube video resistance test would suggest. I’ll start testing the pedal tomorrow. I ordered a handful of OP07s just in case or for future Rat type things.

Thanks for the information/confirmation..

[derevaun]

FWIW, I found some variation among legit LM308s WRT resistances between pins, using Chromesphere's test. I think the most important ones are that pin 5 isn't connected, so no resistance with any other pins, and a few megaohms between 1 and 8, although there's a range with mine. Two tests that are more dispositive are that it sounds harsh(er) with the 30pF cap removed, and the chip itself draws below 400 microAmps. In any case, I have a fake one (from Jameco) that is my absolute favorite in a DOD250 

[blearyeyes]

I finished it today and it is working fine and sounds great. I was never much of a Rat lover but the Alpha Dog is a different animal. 😜