Slight oscilation??

[tasty]

My Diason amp has developed a very slight oscilation/vibretto sound that is most noticeable when playing the "G" string.
What would be the most likely culprit?

[tubetwang]

check for a microphonic pre-amp tube or lead dress.

[tasty]

check for a microphonic pre-amp tube or lead dress.

Cheers the the advice.

Checked lead dress... all good.
Changed Audio valve... that did the trick.. sounds very nice.

thank you once again!

[tubetwang]

You are welcome sir.