6 Guitar Power Tubes Comparison

6V6, KT66, 6L6, 5881, 6550, EL34 using the same Fargen Min Plexi Mk2 and 1968 Marshall 4X12 1982A with a 2010 Gibson Les Paul 1957 Reissue Black Beauty with a 1970s Dimarzio Super Distortion as bridge Pickup