Before starting, I must warn you that acquiring vintage gear can be really risky.
You can end up buying something that is not what you expected or even something that is damaged or modded beyond repair.
July 1969 - December 1983 EXAMPLE: SL/A 24523 D SL/A = Model Code 24523 = Serial Number E = Date Code This amp would have be a 100 Watt Super Lead 1972 January 1984 - October 1992 EXAMPLE: S/A T 24523 S/A = Model Code T = Date Code 24523 = Serial Number This ampwould have be a 50 Watt 1985 JCM900's The JCM900's began using a Bar Code system which consists of 9 digits which are broken down into three sections.
EXAMPLE: 950322589 95 = Year 03 = Month 22589 = 5 digit serial number This amp would have been made in March 1995.
But many guitarrists also decided to try those and they found out that they could get really interesting tones with them. If you thought a Marshall Super Lead was already too loud. Blackmore’s amps had extra power tubes, making it even more powerful, as well as extra gain stages. They are easy to tell apart because the two extra knobs (“speed” and “intensity”) on the front panel.
They were a bit smoother and had a tad less gain than their Lead counter-parts. It is just as good as the other (probably even more versatile), but the “weird looks” probably scare people a bit and they think this is not a good amp. These amps weren’t much popular and were discontinued in 1973.
This is the reason why Marshalls of this early era (up to 1968) are known as “Plexis”.
The sound of this amplifier is “creamy” and “warm”. This amp is more suited for blues players, with a smoother sound.
If you don’t have much experience (myself included, to be honest : P), I recommend asking help from the members here of the community.I won’t write the rest because it may confuse you even more. It’s important to note that, for example, a 1959 amp has nothing to do with the The JTM-45 JTM-45 with “block” logo The first Marshall ever made. The front panel has “Presence”, “Bass”, “Middle” and “Treble” controls, as well as 2 volumes and 4 inputs.It was basically a copy of the 1959 Fender Bassman. In 1965, the plexiglass faceplates were introduced.When I listen to the album, and I hear the sweet tone of that Les Paul through his Super Leads, I feel I’m in “tone heaven” 😛 The change to the solid state rectifier By late 1966 – early 1967, Marshall stopped using the GZ34 tube rectifier in all the models and started using a solid state rectifier instead.The JTM50 now definetly turned into the JMP incarnation of the 1987 model, although the “formal” name ramained the same.