"The Big M"???? Marshall Question

Re: "The Big M"???? Marshall Question

He wants 10k for it, But no mention of a serial #? Strike 1
The 1st proto type JTM45/100 where made for the Who. They hade script logos and dual OT's. So it's NOT a prototype. Strike 2
The logo looks bogus and to shiny for something 40 years old. Strike 3

Other than that, The amp looks legit if he can supply a valid serial# and knock 5k from his asking price.:13:
 
Re: "The Big M"???? Marshall Question

I've never heard of The Big M in over 30 years of ogling Marshalls, but I'm no expert.

May be worth posting on the Marshall board at Plexi Palace? :dunno:
 
Re: "The Big M"???? Marshall Question

This is the most legit auction you'll ever find by a man who is very knowledgeble, friendly, forthcoming and he even has a pretty good tollerance for ignorance.

I doubt any of you has "The History of Marshall" book, but there's a chapter all about the other "Marshalls". Kitchen-Marshall, Narb and Big M. The latter two being the rarest of all. Especially this version !

Dual OT (blocklogo) 100 Watters were indeed the first, but these followed pretty soon after that.

Since you probably want digital evidence, this is pretty much what's in the book:
http://www.drtube.com/marshall.htm#JTM100
In 1965 the first (prototype and production) 100W amps (model 1959) were constructed using two 50W output transformers. Shortly later 100W output transformers were used. The first 100W Lead and Bass models used left over JTM45 panels (until some time in 1966) but the 100W PA models did use JTM100 panels, as these amps sported 8 inputs instead of 4, requiring different panels anyway.

In the first half of 1967 the JTM panels were dropped all together and the JMP panels were introduced.

The early incarnations of the JTM100's varied in design. The JTM100's were the first amps to use solid state rectifiers. A tube rectifier was just too much hassle and too expensive. The first JTM100's used a 3" power transformer giving a B+ of around 560V. Due to a design mistake of Drake (the transformer supplier at that time) the US primary tap wasn't correct, giving a dangerous B+ of around 640V! Later (in 1967) a smaller 2,5" power transformer was used giving a B+ of around 460V.

Early JTM100's were fitted with KT66's. Later JTM100's were fitted with EL34's.

Schematically, all the JTM100's are all very similar. The PA version had 4 channels and 8 inputs instead of the usual 4 inputs and 2 channels.
Click to expand...
In 1965 the first (prototype and production) 100W amps (model 1959) were constructed using two 50W output transformers.
Shortly later 100W output transformers were used.

The first 100W Lead and Bass models used left over JTM45 panels (until some time in 1966)

The JTM100's were the first amps to use solid state rectifiers.

Early JTM100's were fitted with KT66's.
 
Re: "The Big M"???? Marshall Question

Rereading my post, it's a bit harsh and unfriendly. I apologise for that. I meant no harm, I suppose I got a bit defensive for my bud being this close to being called an imposter. :)

Imagine a Les Paul feeding that beast tones that will be cranked through eight pre-rola greenbacks ! :omg: I've got to go change pants now ..
 
Re: "The Big M"???? Marshall Question

Hey V!N,

I didn't take your post the wrong way. I'm glad you posted it. Sometimes I make assumptions without preceding due diligence.

All good from my end, bro. :fing2:

- Keith
 
Re: "The Big M"???? Marshall Question

I wasn't thinking of buying it, I'd just never heard of it, and it seemed a bit odd. Thanks for the info.
 
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