Produced during the 1990s, the JCM 900 Mark IV SL-X (Super Lead X-tended) amp was an evolutionary link in the Marshall Master Volume series.
By adding an extra ECC 83 (12AX7A) valve, Marshall engineers created a gain-drenched front end that combined twin gain controls, from 0-10, and another that went all the way to 20! This was the amp that KISS used on their world tours during the period. Ace Frehley and Paul Stanley could afford any amplifier, but they found only one with the sound they needed to fill arenas with the power of their raw, blistering rock n roll: the SL-X!
Although voiced for metal and thrash, these amps are also sensitive and can be trimmed for tone. Back off on the gain and you can still have the blues. Combine the gains and you can rock all over the world. Crank it and youll be thrashing all the way to the top!
This is the top that I chose when playing clubs (some small and some up to 600-seats) with The Blame and Plunge. For larger clubs I used the amp in its 100-watt power mode. For smaller venues, I used the low power mode to play at reduced volume. Of course, the amps I used were always miced through the PA system anyway, so I just needed enough stage volume to hear myself. Some clubs had high stages or funny acoustics that literally soaked up all the volume I could muster. Thats why Im glad I opted for the 100-watt model.