Anyone every try this? It's basically what my Sovtek is, and I've lately been curious about trying some EL34's, for the extra breakup and crunch.
So, what tonally happens to a JCM800 going from one to the other?
Is the bias adjustable on that amp? That's all you've got to worry about. If you can bias them up it's safe. You'll get less breakup and a bigger, tighter bottom.