This 1967 Marshall JMP-100 Super Bass is the amp that ended my personal Marshall journey and at this point this amp which we have dubbed “REX”, has received somewhat of its own cult following among our customers. It has become the go to plexi for a lot of guys aiming for that classic rock tone.
It is an early JMP amp that still features most characteristics of a late JTM-100 Black Flag – Dual Rectifier setup, relatively low filtering and the same Drake transformers (1202-132 Output Transformer) that the latest Black flags had.
Spec-wise it sits in the middle between the earlier EL34 based 100W designs and the later more standard JMP-100 amps. It is probably pone of the reasons why it is able to get so many of the legendary tones with ease – from earlier and later Plexi years.
You can easily get it into convincing AC/DC territory, Cream, Free, Hendrix, Zeppelin. While it is not easy to prove which artists played this particular model, its tonal DNA can be easily found in many. This Black flag type spec is one that quite a few Marshall Connoisseurs that have tried them all consider this spec their favourite. And quite notably Thomas Blug is among them and he has stated that his black flag Super PA is his fave.
The Drake Output transformer gives this amp a more harmonically rich response compared to the later Dagnall equipped amps. Though it is mid focussed, it is more open and complex compared to the later amps.
It has a visceral response in the low mids, an unparalleled punch and beautiful, round and musical mid focus, which never masks detail and clarity at the same time.
What also stands out is that it has a 3d quality to the attack like nothing else i’ve heard: if you would imagine the attack of the note in the time axis, it compresses the onset of the attack and hence has a perceived softness/roundness, but in the next moment the full force of the attack kicks in even through quite strong crunch gain levels that allows a beautiful clarity, string separation and dynamics, especially for a Marshall style amp.
Extremely dynamic, touch sensitive, 3-d sounding, big, bold, warm and all the other juicy adjectives that are thrown around all too often, but i give them all to this amp, it is all there in spades.
It retains clarity and detail even when dialed in for a warm and round tone and it can be played like its own instrument due to this amazing 3d quality of the attack, which lends it so much depth.
It is a mid focussed amp that thrives from and in the mid frequencies, especially the low mids. It is an amp that will easily cut through the mix without it ever being or needing to be overly bright.
It excels at clean tones, edge of breakup, light and medium crunch and it is a phenomenal pedal platform that is up there with a Hiwatt Custom 100 and a Fender Twin Reverb.
It is an amp without an Achilles Heel, but as all bass spec Marshall amps it has a lot of bass content. If it is overbearing for your needs, there are many ways to keep the fantastic core tone and texture intact, while reducing the bass – EQ pedal in front of the capture, lowering bass knob on the capture, a drive or boost pedal that cuts some of the lows.
To me this amp is the perfect Strat AND Les Paul amp. Jimi tones? All day long. Jimmy tones? You bet.
A huge part of the magic behind the visceral attack and low mid punch you get out of this amp comes from the 1968 Marshall 1982B straight 4X12 cab with all original G12H30 55Hz speakers (T1281) and Pulsonic cones. This is the cab that was used by Hendrix, Page and all the big rockstars of the 60’s and 70’s as it had the necessary power handling.
The set includes a whopping 38 DI Captures ranging from clean to lead gain levels and featuring various EQ settings per gain level. 2 of our custom Studio Quality Cabinet IR’s of the Marshall 1982B 4X12 with Celestio nG12H30 55Hz Pulsonic coned speakers are included. Please refer to the full list of captures in the product picture gallery.
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Absolutelly Killer!
When I played this pack it was the exact moment I finally got the Marshall growl, organic chug, and warm mids tone I always had in my head. The Rex is the Rex, period. Exceptional quality specimen! And with the clarity and liveliness that only Amalgam Audio captures provides! Awesome.
Remarkable!
Definitely recommended!
I have quite a few packs from Amalgam and this one is my favorite so far. I like running the DI captures in to a PS-100 to an Friedman 4x12 and holy smokes what a sound. These capture are incredible for getting that vintage Marshall sound. Love them.
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