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"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
cheers fellas's think i'll give it a go. the 73 bandmaster tfl 5005d i've got definately shows a 12at7 on the valve map. will let you know how it goes!
i.e. the specific type of phase inverter in your amp.
I'm with JPF - you can get less gain in a phase inverter with a 12AX7 / ECC83 than a 12AT7/ECC81, depending on the details of the circuit.
AFAIK, you can't hurt anything by trying it (maybe not always true going in the other direction).
"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