Help on my May Queen Booster

[WelshWonder]

BUMP

Sorry guys, but what can cause this noise?

[petemoore]

It's the only type I got, it's a 2.2uF rated 50V. Could that cause problems then?
  If it hasn't been reverse polarized and is new it's almost certainly good.
  I've re-verified transistor pinouts, and found mispinouts after verifying them a few times..

[MartyMart]

It is a "high gain treble booster" pedal, so you are going to get some hiss, this is the reason
that I don't use mine much !!
The 2N5088 at Q1 would probably help you a bit, as it's lower noise than a BC109.
There's a couple of things you could try :
Adjusting the 33k between Q1 C and Q2 B increase should lower the gain a bit
Adding the "Stupidly simple tone control" at the end , may offer some "hiss" control ( search )
Did you add the optional high filter cap around the 10k trimpot ??

Marty.

[gervasoni]

Hi, don't know if this could be helpful, but i would try with a lower hfe transistor. Current gain on a BC109 is really higher than 2n5088 one, and this could be the source of hiss (oscillation i suppose, as it disappears as you pluck a note, but it should appear also as a noisy distortion). I'll try with a 2n5088, or a lower gain transistor like BC237 and even 2n2222a or 2n3904. The MPSA06 sounds really nice when driving a J201 in my booster!
Cheers

[enigmur]

The BC109 has a different pinout than the trannie you replaced, it is BCE, not CBE (well mine was anyway).

Have you tried twisting the C and B legs around so they swap sockets? (make sure they dont touch).

Then again, I dont think it would work at all if this was the case...