Help! Need Help with TL072 Weirdness!!!

[m4j0rbumm3r]

I replaced the TL072 in my Morley wah and this solved my loud hiss problem. I guess the fresh TL072 stabilizes after a discontinuity, whereas the old one went haywire.
As I soldered in a dip8 socket, I might still try a supposedly better op amp type than the TL072 and see what that does. Swapping them in and out will be simple now. I might give the OPA2134 a shot. Before I was thinking of the NE5332 but I found out its lower input impedance makes it less suitable to be the first thing after the guitar.

[Paul Marossy]

I replaced the TL072 in my Morley wah and this solved my loud hiss problem. I guess the fresh TL072 stabilizes after a discontinuity, whereas the old one went haywire.

Weird. I guess it's possible that the opamp was damaged, but still functional. Interesting!

That seemed to be a real stab in the dark, but indeed it fixed the problem. Never say never I guess. 

[R.G.]

Parts can be subtly damaged. See http://geofex.com/circuits/when_good_opamps_go_bad.htm