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The oldest 100w Marshall on the web
      1965  JTM100 SUPER P.A.

It has all that jazz : Plexi , JTM , certainly block logo but now a handmade tippex logo , alumiium chassis , KT66 valves , Vox type copper vents , gold on white back panel , extra-heavy laid down transformer and it is 100% original (except tippex). Believe me or not , I have not played it yet. I just received it have been looking at it for hours. Sometimes collecting can drive you mad when you find such a piece.
All the 100w of this period (proto-plexi) bear the SUPER PA AMPLIFIER mention on the back , even the so-called JTM45 100w and 1965 catalogs only showed Super PA amps in 100w.This is why I have always considered these JTM45 100w very suspicious. (for example, Aspen Pittman JTM45 100w amp clearly shows a rubbed off PA mention and call itself a 'SUPER AMP').Of course you can argue that they do have the Vox vents AND small front , but I will still not be convicted .The debate is opened for it is a very unknown period of Marshall history.

What a sight ! All that original treasures . I can take my eyes out of those KT66 on choke and transformers background. Serial number is : 6875 : that still qualify for '65 but let us look closer at the power transformer:

It is the first time I see such a transformer. I am 100% sure it is original because the voltage selector is the same bakelite plug usually found on Marshall stuff. It is so heavy , the amp is completely  unbalanced. It is a miracle the aluminium chassis could hold that weight all these years.

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