Нитроглицерин, ещё раз повторюсь что плекси это ампы с пластиковой переднея и задней панелью а все остальные с золотым алюминием к плекси не имеют никакго отношения хотя и схематика и комплетующие могут быть аналогичными.
The amplifiers from this era are easily identifiable by their acrylic glass (a.k.a. Plexiglas) front panel, which earned them the nickname "Plexi"s. These now have significant collectors' value. In 1969 Marshall released a 50 watt version of the 100 watt Superlead known as the 1987 Model. These were also called 50 watt 'Plexi's. The amplifiers from the 1970s onwards can be distinguished most easily by their brushed metal front panel. After 1973, in order to streamline production, labour-intensive handwiring was discontinued and Marshall valve amplifiers were switched to printed-circuit-board (PCBs).
... и добавил: After 1973, in order to streamline production, labour-intensive handwiring was discontinued and Marshall valve amplifiers were switched to printed-circuit-board (PCBs). Much of the debate about the difference in tone between the plexi- and aluminium-panel Marshall amps comes from the fact that in 1974 Marshall's US distributor had them change all of the amps sold in the US and Japan over to the much more rugged 6550 instead of the EL34 output tube. This produced a much different sound from the EL34—a sound perceived as less smooth and more metallic when overdriven. This change was brought about due to reliability problems with the EL34's, and the 6550 generally allowed the amps to make it through warranty without problems. The circuit changes required to switch the amps were very minor, and it was easy to change from the 6550 to the EL34 or vice versa by changing a few resistor values, moving the tap for the feedback loop and rebiasing the amp.[citation needed]
... и добавил:Вот это правильно. Звучание маршалла плекси можно легко узнать, даже если его упрятать в коробку от фендера 
вот именно что плекси по звуку ох как отличаются осбенно винтаж ,а кто не врубается всё подряд плекси обзывают
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