The last time I had this issue, was with my Rocket build and it turned out that the board was conducting.
I have same issue in AC-30 and I have all the parts mounted in free air on the valve socket.
Any thoughts?
Why is the P.I. stage in an AC-30 so sensitive to noise?
Moderators: pompeiisneaks, Colossal
Why is the P.I. stage in an AC-30 so sensitive to noise?
Yours Sincerely
Mark Abbott
Mark Abbott
Re: Why is the P.I. stage in an AC-30 so sensitive to noise?
I think it’s purely down to it being a high gain power amp, operating open loop. Ok, the ‘higher than typical’ LTP tail loses a couple of dB potential gain, but EL84s have a high amplification factor. Overall it makes a lot out of a little, hence the LTP grids are rather more sensitive than normal, to both wanted and unwanted signals.
My band:- http://www.youtube.com/user/RedwingBand
Re: Why is the P.I. stage in an AC-30 so sensitive to noise?
The thing is, I don’t get this sort of noise from my Trainwreck Rocket clone, though the layout and power supply are totally different.
I’m not a big fan of the AC-30 earthing, I think it could be better.
I’m not a big fan of the AC-30 earthing, I think it could be better.
Yours Sincerely
Mark Abbott
Mark Abbott
Re: Why is the P.I. stage in an AC-30 so sensitive to noise?
Certainly better filtering and grounding would make it quieter.
Re: Why is the P.I. stage in an AC-30 so sensitive to noise?
I think you could double the 8uF caps to 16uF and not hear a difference to the clean sound. I know this as I have tried it.
The serial earth bus is just crazy,
The serial earth bus is just crazy,
Yours Sincerely
Mark Abbott
Mark Abbott