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Marshall JMP bass amp 100W

jules

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Marshall JMP bass amp 100W
« on: November 23, 2009, 04:05:33 AM »
I just won the above amplier on ebay. A 1979 model. It needs some work, but i'll just take it to the Marshall repair guys.
 
I just need a new cab to go with it.. a Marshall 4x12 most likely.
 
Anyone else tried anything other than that and preferred the result?
 
Anyone here use one at all?

Marshall JMP bass amp 100W
« Reply #1 on: December 18, 2009, 03:19:01 PM »
I used to have one, just about the same year. I stuck out like a sore thumb no one in the states uses them. GREAT sounding amp I paired it with a Marshall baffeled 2x12 and a Hiwatt 2x15...................... it killed. I sold it in the mid 80's and went to GK for about 3 months then went right back to Marshall, I could not find another 100w so I settled for a 200w Major ! I still have it !

jules

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Marshall JMP
« Reply #2 on: December 19, 2009, 01:40:33 PM »
Hey Scott,
 
I just got mine back from Marshalls (a 5 minute drive from my house) with a good clean up.
 
The pots are still a little scratchy, but they said that they don't stock the original ones anymore, and new ones would alter the tone. So I left that as is.
 
So i'm ready to play this out.
 
Although it is a little louder, I was surprised that it wasn't so different in tone from my Fender Bassman 100 head that I usually use.
 
Another head I am interested in is the Ampeg 100w V4b.  Has anyone compared the V4b to the marshall JMP superbass and Fender bassman 100? Which do you prefer?

Marshall JMP bass amp 100W
« Reply #3 on: December 19, 2009, 03:20:36 PM »
V4Bs are great amps, a bit cleaner than the Marshall a little more wallop or kick in the sound I prefer it to the Bassman 100 but out of the three I would take the Marshall any day. Having said that I think most players would like the V4B better though as it is cleaner. I took endless crap from sound men in the 80's cause my Marshall was so "dirty" I loved the tone but by then everyone was on the "clean" band wagon.  Even today at almost every sound check the sound man says  "ok thats good now can I hear your clean sound" to which I reply "that is my clean sound" never fails to get a laugh from the band. V4Bs over here until very recently could be gotten for 200-250 USD. Valuse are starting to rise but I think you can still get a good deal on one. Marshalls though not popular are always exspensive here, the last 100w I looked at they wanted 1,500 for it, not a bad price just more than I wanted to spend. Enjoy your new Marshall !  Pair it up with some 12s and 15s it will roar ! That is so cool that you live 5 min. from the Marshall factory !
« Last Edit: December 19, 2009, 03:37:04 PM by godofthunder59 »

Marshall JMP bass amp 100W
« Reply #4 on: December 19, 2009, 03:27:35 PM »
In fact the 2x12 cab in my rig picture is the the cab I used to have with the Marshall 100w Bass. This cab sucks at low volume but crank the volume and it just comes alive ! Right now i am working on a deal to get a 70's Hiwatt 2150 (2x15) cab to put back in my rig, I had one for years but foolishly sold it in '89. Kenny from the LBO photo shopped what the cab will look like in my rig he added a extra DR201 for laugh's (I wish!)

Marshall JMP bass amp 100W
« Reply #5 on: December 19, 2009, 03:36:08 PM »
As for the Bassman 100 I never owned one, I tried them in shops and sold them in shops but I found them to be very exspensive at the time for what you got because of the Fender name. There were better choices Like Sunn, Traynor and Ampeg imho. Always wanted on though !

jules

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Marshall Ampeg
« Reply #6 on: December 19, 2009, 03:46:34 PM »
interesting... I am possibly thinking the Marshall is too dirty for me. Not 100% sure yet. Pricewise the Ampeg and Marshall thing is somewhat reversed here - I guess it comes down to what is readily available, and Marshalls are everywhere, especially the newer stuff.
 
Having Marshall based here is great. Everyone knows someone whos works/worked there, and you know you can buy amps in any state and get them fixed easily and cheaply.
 
I aslo REALLY want an old Ampeg B-15 (for recording and home use), and a 60s Gibson valve amp (just to hear what the original bass designers were hearing when they made the old EBs), but they also never come up. Amp shipping is steep, although i'm getting close to just paying it!
 
I'm currently using two Ampeg cabs live, both new SVT models, a 4x10 combined with 1x15, but I guess somewhere theres a Marshall 4x12 with my name on it. I will hold out for one roughly the same age as the head.
 
I recently missed out on a 1972 Hiwatt 2x15 that was £120. Just didn't have the money on the day - but I really wish i'd made more effort getting it

Marshall JMP bass amp 100W
« Reply #7 on: December 19, 2009, 04:23:17 PM »
120 pounds for the 2150 ???????????? holy cow you don't want to know what I am going to pay for a empty 2150. Another often over looked Ampeg is the B-25B it is along the lines of a Fender Bassman, 55w (more like70w) all tube head with a 2x15 cab. I own one and love it. The head is just perfect for rehearsal and recording, these at least over here can still be gotten for around 200-250 USD, I paid under 80 bucks for the 2x15 cab. How about a picture of your Marshall ?
« Last Edit: December 19, 2009, 04:53:01 PM by godofthunder59 »

jules

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hiwatt cab
« Reply #8 on: December 19, 2009, 05:55:15 PM »
Quote from: godofthunder59;12748
120 pounds for the 2150 ????????????

It was £120 BIN, starting bid 99p. It was collection only, not too far from me.
 
I bid £100, because it was a week before payday, and IIRC it was one of those pay immediately deals, and I didn't want to win there and then.
 
A day before the auction ended I was still high bidder on 99p, so he pulled it. I could have won this for 99 English pence....
 
I'm hoping he'll relist

Marshall JMP bass amp 100W
« Reply #9 on: December 20, 2009, 10:06:54 AM »
Just had to reply to this line Jules...

"The pots are still a little scratchy, but they said that they don't stock the original ones any more, and new ones would alter the tone. So I left that as is."

Sorry, but that's a load of old BLX! Providing you use the same value pots and of the same type Logarithmic or Linear it can't make any difference to the tone.

That's the normal reply you get from repairers when they cant be bothered to replace them.

I've changed dozens of scratchy pots on vintage amps in the past; OK it takes 10 minutes a pot perhaps, but if you can live with the scratchy ones I guess that's OK.

Mike.
« Last Edit: December 20, 2009, 11:50:16 AM by Repairman77 »
Retired Radio and Electronics Engineer residing in Cambridgeshire.

jules

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JMP repair
« Reply #10 on: December 20, 2009, 03:12:00 PM »
Quote from: Repairman77;12761
Sorry, but that's a load of old BLX! Providing you use the same value pots and of the same type Logarithmic or Linear it can't make any difference to the tone.

Yeah, well i'm guessing they just didn't have any in stock... To be honest I didn't have a look inside so I don't know value they are. Perhaps they are an obscure one, hard to track down now?
 
This is the Marshall official repair shop, and there are piles of other old JMPs and other 60s and 70s amps (a very nice place to look around actually)
 
I won't be changing volume much on stage, so a little scratch here and there doesn't really worry me.

 

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