n the 1990s, Marshall updated its product line again with the JCM900 series. Reviewed by Guitarist magazine in the UK and given the line, "Shredders, here is an amp you won't need to have modified", this move by Marshall was again an outgrowth of musicians' desires, featuring more distortion than ever and retaining popular aspects of the late JCM800 models. However, despite such marketing claims they were not as hi-gain as advertised, and used solid state components for much of the distortion in some models - something which many guitarists did not like. Marshall rectified these shortcomings with the SL-X series. This model was one channel, 2 switchable master volumes, and was given an additional pre-amp ECC83/12AX7 instead of diode-based distortion. Still, if not for shredders, the JCM900 was well received by younger players associated with pop, rock, punk and grunge which was widespread by the early 1990s. The Dual Reverb was also notably used by Dave Navarro. There are three different variants of the JCM900. The most common models are the 4100 (100 watt) and 4500 (50 watt) "Dual Reverb" models, which are a descendant of the JCM800 2210/2205 design. These models feature channel switching and diode distortion. The 2100/2500 Mark IIIs are essentially JCM800 2203/2204s with added diode clipping controllable via a knob on the front panel and an effects loop. These are fairly uncommon and were not in production for long before being replaced by the 2100/2500 SL-X, which essentially replaced the diode clipping from the Mk III with another 12AX7/ECC83 preamp tube. These are easily the highest distortion of the three variants. Although the EL34 had at this time begun to return to prominence, a number of these were shipped with 5881 valves, a ruggedized variant of the 6L6 family of output valves. Most of the JCM900s and 6100s built between 1994–1998 left the factory with the 5881s. Around this time, Marshall released a few "special edition" amps in this range, including a "Slash Signature" model, a first for the company. This was actually a re-release of the earlier Silver Jubilee 2555 amplifier, with identical internals, a standard Marshall look, and a Slash logo. This amp retained EL34s and 3,000 units were produced from 1996 to 1997.[21]