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The 2555 was one of their most successful products out-right, and since it was discontinued in 1988 one of the most common questions they have been asked is, “when are you going to re-issue the 2555 Silver Jubilee?” So, by popular demand, they have created the 2555X, which is a modern re-issue of the 2555, with the same sonic characteristics and functionality.
The 2555X circuitry is taken from original 2555 diagrams and has been checked against the 2555 head in the Marshall museum. With modern production techniques they were also able to make some improvements to the electronics. Switching circuitry has been improved to avoid a relay flickering problem found on some original 2555s. Improved (DC) heaters ensure no noise. The introduction of external bias points on the chassis for re-valving and servicing. Black fibreglass wires that are high temperature and high voltage resistant. And the multi-pin connectors have been improved with higher insertion force and current capabilities but remain PVC, just like the originals.
There have been some feature improvements made to the 2555X. On the back panel the original 2555 had two speaker output jacks and a rather awkward Output Impedance Selector. For easier operation the 2555X has no selector and instead has five speaker output jacks ranging from 16 Ohm to 4 Ohm. They have also removed the Mains Voltage Selector from the back panel, as each 2555X amplifier is fixed to match the mains voltage of each country.
There are also some minor cosmetic differences between the 2555 and the 2555X: on the 2555X the handle end-caps are silver metal instead of black, the input jack nut is chrome instead of black plastic, and the Mains & Standby switches look slightly different to the ones on the 2555, as the originals are no longer produced.
The 2555X head, together with the 2551AV™ & 255BV™ 4 x 12? speaker cabinets makes the classic looking and incredible sounding Silver Jubilee re-issue stack.