Marshall JCM900 - Amplificator chitara head + stack

The JCM 900 Dual Reverb was produced by Marshall during the 1990's. Marshall engineers voiced Channel A for sparkling clarity but added enough percussive punch to kick out every note. Channel B provided "potent gain and grinding aggression" for solos. Each channel has its own reverb control. The Dual Reverb sounds so fine that no less than ZZ Top bluesman extraordinaire Billy Gibbons used a quartet of model 4100 heads during the band's Recyler world tour.

Specifications

Separate preamp gain controls: Channel (A) 1-10, Channel (B) 0-20
Tone network with Treble, Middle, Bass, and Presence controls
Individual master volume controls for each channel
Separate reverb controls for each channel
Manual or footswitch operation for channel selection
Effects loop with sensitivity control
Direct and recording compensated line ouputs
Impedance selection switching
Two speaker outputs
High/low power switching (pentode to triode)
Valve failure LEDs
Entirely wired and assembled by hand in England
100 watt models (model numbers 4100, 4101, 4102) feature 4 x 5881 output valves, 3 x ECC 83 preamp valves
50 watt models (model numbers 4500, 4502) feature 2 x 5881 output valves, 3 x ECC 83 preamp valves
Note: some models came factory equipped with EL34 power tubes instead of 5881s.