tele_jas
Well-known member
I've seen some threads saying that the hotter EL34 tubes are not safe for the Mark V (and they show some fried caps or screen grid resistors). I bought these before I seen those threads.... Will these be safe to use without causing damage? I'm not sure what the JJ rating system is? Are 4.4 cooler (like 4.4 out of 10) or is it 4.4 out of 5?