Re: Pedals for JCM800
My Real Tube 901with a 12AU7 worked really well with my JCM 800 for smooth, singing lead solo tones, though there are probably better pedals for crunch distortions and metal type gain. The 12AU7 tube has less gain and fit my needs better, but you can go experiment with swapping the stock 12AX7S for an AT, AY, or AU. Lots of options; lots of fun.
Bill