the JCM800 and 900 series, although the controversial diode clipping circuit used in the later 800 and 900 amplifiers has been removed in favour of additional valve gain stages. Although lumped together as JCM2000 models the DSL and the TSL have different circuits and are more distantly related than the model range suggests. The DSL is an extension of the JCM800 series with several changes including dual reverb controls and is generally considered to be an excellent workhorse although it lacks the direct foot switching of all four possible channel options – clean/crunch/OD1 and OD2 – instead it only offers 2-channel switching and both channels share the same tone knobs. The DSL line does have a 6 button footswitch that can be purchased that allows switching between channels and modes for each channel. The JCM 2000 was touted as the best Marshall ever, with a question mark in the ads in various publications. They followed the 100W and 50W heads with the DSL401(40W) and 201(20W) combos, also with channel switching. In 2012, Marshall released a revamped DSL line with production and assembly in Vietnam. It consisted of the DSL100 head, DSL40 combo with a 12 inch Celestion speaker, DSL15 head and combo, DSL5 combo with a 10 inch Celestion speaker.The series was revamped in 2018 with a DSL20 head and combo, both with EL34 valves, thus discontinuing the DSL15s and an addition of a DSL1 head and combo to satisfy the bedroom player. Marshall looked towards a new flagship to nail all the compromising of the earlier models, the JVM, made in a variety of models and ranges. These amplifiers have up to four channels, each with three-foot-switchable modes, dual master volumes, reverb controls for each channel, and a foot-switchable effects loop. These features can be programmed into the standard foot-switch to be foot-switchable as "patches", so now the user can switch from, say, a clean channel with a chorus in the effects loop and reverb, to a medium-gain rhythm sound with no effects, to a high-gain lead sound with boosted output volume, with one click of the foot-switch per sound. The JVM range consists of the JVM410H, a 100-watt four-channel head; the JVM410C, a 100-watt four-channel 2x12" combo: the JVM210H and JVM210C, 100-watt two-channel head and 2x12" combo respectively; and 50-watt versions of these, JVM205H (head), JVM205C (2x12" combo) and JVM215 (1x12" combo). Joe Satriani uses a signature JVM