I was in the market for some Celestion Greenback speakers (G12M) which are supposed to be the holy grail of speakers… together with the GH12.
Browsing on ebay… -as you do- I found someone selling this odd looking Marshall supposedly from circa 1976 which some Rola / Celestion speakers designed for Jim Marshall.
The seller was claiming that these speakers were in fact the famous GH12 -50 watts in this case- so I started doing my research, there is almost nothing about the JMP2200 all the Internet knows is that it’s a mid 1970 Marshall and it appears to be one of the first Solid State amps created by them.
I then moved on to researching the speakers, checked the serial number.. and boom! again.. 1976 Rola Celestions, I was so excited! long story short.. I went ahead and purchased the amp. It is probably the heaviest amp I’ve ever carried! after 3 days my arms are still in pain.
I plugged in my Gibson SG tinkered around with volume and… it was pure magic, the tone that comes out of this thing is unreal, I’ve owned probably around 20 Marshalls from different price brackets including of course 100% valve amps… and to me this JMP 2200 is the best thing I’ve heard, you get Ac/Dc tones without any effort, just plug in and play.
These beasts are not easy to find… but if you do see one on sale, do yourself a favour and purchase it! I paid around $180 US dollars for mine but I would’ve paid a lot more knowing it sounded this good.
Controls are pretty simple, the only thing that stands out are the inputs, it’s got 2 + 1 inputs, being bright and normal (?) -at least that’s how they sound to me- and one that combines and a volume for each.