IC subs for Pastie Drive

[wretched]

I substituted a TC072 low noise in place of the JRC4580 that they ask for in a "Pastie Drive"
http://home.comcast.net/~gprause/BuildDocs/Pastie_V1.1_Build_Doc%20V2.pdf

The J201s both measure 9.02 Gate, 470 Source, and 2.98 Drain. I am getting some squealing when I dime the grain and Tone Only when the Mid switch is Down completely. I also noticed that I get some feedback if I am facing the pedal with the Guitar again only when the mid switch is down.

I have some JRC4580s coming in, but I am wondering if there is something else causing the issues?

[Matt]

The tl072 should work just fine.  You should be getting 9v at the drain of Q1 and Q2.

[wretched]

Sorry it is 9v on the drain. I had my numbers backwards. I tried other j201s and 2n5457s but I get the same issue. I am going to go back and check the soldering and do an audio probe tonight.