'69 Simms-Watts AP100 MKI (EL34) FANE w/RCF drivers in '72 4×12 Super Cab! Ultra-Linear, Powered by 4 Mullard EL34 + huge PARTRIDGE PT & OT. Preamp has two bridgeable channels, MV & Presence. Tubes- has four 12AX7 & one 12AU7. BRIGHT Tone Boost/Cut Control. Huge warm cleans & similar to HIWATT when dimed. Overbuilt & LOUD. They were used at the first two GLASTONBURY Festivals, By MICK RONSON & PINK FAIRIES. Killer PA & Bass amps.. The company used to design military aircraft..