I don't expect to completely cure the noise, just cut it down as much as possible. I found this article that stated:Originally Posted by duhvoodooman
"Note that in going to higher gains, you will inevitably increase the noise in the output. This may be curable to a degree by changing the input transistor to a quieter part (MPSA18 or 2N5089 is good) as well as swapping to a more modern and quieter opamp like the LM833 or both."
The Keeley Baked Mod page also specifies:
"I also change the input transistor to a MPSA18 for lower noise operation."
Now, I like the RC4558P very much, so I won't be changing that, but I though I'd give the transistor swap a try. It might not cure all of the background noise when going to higher gain, but it if cures some of it I'll be happy.
Well, this is where I've seen a mention that it might be tonally important. I've also tried it out - I put a 0.1uF cap there and I got more bass than I had bargained for. But I really like the 0.02uF cap, and I don't think mr. Keeley changes that value, so I'll just swap it for a 0.022uF metal film for better quality and leave it at that.Originally Posted by duhvoodooman
Indeed you are right, sir. I did try a 0.22uF, I thought the pedal got too muddy though and went back to the 0.1uF.Originally Posted by duhvoodooman
Thank you for your reply!