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Very interesting!
Which of these did you go for? I can't decide!
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Power_freak is right in that it could be a badly unbalanced Phase invertor valve too. Easy to swap valves around to prove that.
I'm not familiar with this amp or the implementation of the power scaling though. (I'm not a fan of power scaling.)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Thank you much to everyone that chimed in.
I pulled the PI tube and the glass near the pins has a green mark on it. Didn't have any spare AY7s only AX7s so I pulled V2 and used that and now it works as it should! No weird buzzy overtones.
Not sure what would have made the tube go like this - does anyone know if it's a sign of something inside not functioning properly which will just ruin every PI tube?
Nothing in the valve will leak green like that, could be that someone used a marker on the valve when selling them so that dodgy returns could not be done easily. I would open the amp up and just check everything else around that socket. See if Steve used green goo in the amp etc
Make sure you have the right type of valves in the right places too.
A 12AY7 would normally only be used in V1, or occasionally in another position where it is effectively still the first valve, depending on the chassis layout. Is it possible someone has put the wrong valves in the wrong places?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I will definitely let Steve know what the problem was and hopefully this thread will help somebody in the future
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein