Tube driver

[Tom Lauten]

Hi folks.

I just finished my Tube Driver build (Toms variation) on the Tube Driver125B V1.2 PCB.

Everything worked great on the first go and MAN does this thing pump out some great tube of sound!

I am having one weird problem. When I play (and ONLY when a note has been struck) I get a noticeable static sound along with the strings note. It's not CRAZY loud but it is there for sure. I switched tubes and it still happens. I played with the gain and it seems to make no difference.

Any Ideas what could be causing this static crackle when it's playing a note. It is quiet as you would like when strings aren't being played.

[Tom Lauten]

Upon trying it again I think describing the odd sound as a mix between soft static and "fizzing" would be a more accurate description. A crackle is too harsh a description of what I'm hearing. Is this fizzing/static sound common with tube based designs? Is it the tube "doing its thang"? I'm using a vintage Mullard ECC81 but it did pretty much do the same thing with a Shuguang ECC81 as well.

I also played with the trim pot a little but this didn't seem to effect it much if at all.