I have a Randall RG-50TC and I wanted to replace the tube to get rid of high pitched noise coming from it.

I wanted to buy 4 Electro-Harmonix 12AX7 and 2 JJ E34L (EL34) for it an was wondering... Will they work with my amp? and will they sound good for metal?
if your amp takes 12ax7's and el34's then it should work fine. you may need to rebias it if the amp isn't fixed bias.
check the tubes thread though.
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