JMP info

Las Palmas Norte · 04-23-2010, 08:24 PM

I'm looking for a bit of info if anyone is up to it.
I've owned this JMP head since the mid 90's.
It's pretty bare bones with no frills what so ever.
The model number stamped on the rear panel is 2204.

Thanks in advance, Barrie.

Mike B · 04-24-2010, 03:49 AM

It might be very early master model. I've heard about some 2204 and 2203 made with these switches instead of JCM ones in the very beginning of production.

core · 04-24-2010, 01:14 PM

To me it appears to be a later JMP Master as they didn't start putting the serial number on the front until 79. What is the letter on the serial number? K = '78, L = '79, M = '80. From the sticker on the back it has the CSA, Canadian Standards logo. JCM 800's have the metal toggles for Canadian export I believe as well. Also it has pointer knobs which I think were later 70's early 80's JMP/JCM from what I've seen.

So late 70's Canadian export 50 watt (2204) is my guess.

Las Palmas Norte · 04-24-2010, 08:14 PM

Yes ... it has the CSA (Canadian Standards Association) logo and some minimal bilingual (french) stenciling on the rear jack panel. It was sold as a 50 watt head back then, so it confirms this fact.
The serial number is O4**9N stamped on the gold front panel underneath the red "power on" light.

Cheers and thanks, Barrie.

core · 04-25-2010, 04:00 AM

Quote:

Originally Posted by Las Palmas Norte

The serial number is O4**9N

The "N" makes it an 81, last year for these.

janarn · 04-25-2010, 01:03 PM

JMP export amps were made for three more years.

custom53 · 05-04-2010, 02:00 AM

Quote:

Originally Posted by core

The "N" makes it an 81, last year for these.

I always thought '81 was the first year for the JCM models...
And "M" was the last year for the JMP...1980...

Here is my 1980 "M" 2203...

Las Palmas Norte · 05-04-2010, 02:25 AM

Very cool custom53 ! ... Here's a closer shot of "JMP" designation on the front panel of my '81. I like the metal toggles since it separates if from most other Marshalls visually.
How long have you owned yours and do you have any history on it?

Cheers, Barrie.

custom53 · 05-11-2010, 01:55 PM

Quote:

Originally Posted by Las Palmas Norte

Very cool custom53 ! ... Here's a closer shot of "JMP" designation on the front panel of my '81. I like the metal toggles since it separates if from most other Marshalls visually.
How long have you owned yours and do you have any history on it?

Cheers, Barrie.

I've had it just a few years. I sold my beloved '77 JMP 2204 years ago (and it was MINT) and regretted it ever since.
I ran across this one for a great price and jumped on it. I have been debating on doing a tube swap to EL34s or E34Ls but haven't done it yet. It came with 6550s... (which are still in it). I was told by the seller that it was a Canadian model but I really have no idea.

It is a beast though...!

Las Palmas Norte · 05-11-2010, 07:52 PM

Speaking of tube swaps, any supplier recommendations, on line or not? (perhaps worthy of a separate thread?)
If your's is a Canadian model there's going to be some French stenciling on the rear jack panel.
Mine is something I doubt I'll ever part with. As you say, "a beast" with some serious delivery all around.

Cheers, Barrie.

Viking62 · 05-14-2010, 01:21 AM

Strange that its an 81 model with those older power switches.
I had a JMP2203 Master. A 1979 build and it had the larger chunky switches, but maybe that was just common to Australia at the time?

Las Palmas Norte · 05-14-2010, 01:33 AM

Maybe Marshall was clearing out the last from the parts bins and Canada got stuck with the old metal toggle switches that year?

emitch.sr · 05-15-2010, 01:03 PM

I have an 80 JMP 2203 and it has the square switches also. Do you guys have any suggestions for pre amp tubes? I am thinking of swapping mine out and trying something else but don't know where to start. I've seen some who use different tubes in different positions v1-v2?? I don't know if I would screw something up by just trying different brand tubes in different places?

019228 · 05-15-2010, 01:23 PM

Quote:

Originally Posted by emitch.sr

I have an 80 JMP 2203 and it has the square switches also. Do you guys have any suggestions for pre amp tubes? I am thinking of swapping mine out and trying something else but don't know where to start. I've seen some who use different tubes in different positions v1-v2?? I don't know if I would screw something up by just trying different brand tubes in different places?

Check with MartyStrat. He can definitely help you with your tube questions.

rykus · 05-15-2010, 10:15 PM

check out the pre amp tube forum for anything about any type, its llllooooonnnggg but theres many pages of worthwhle tips and suggestions. but all depends what you want to hear. i like mullard and the amprex/valvo they are darker and less treble, i found telefunken tooo bright and rca more gainy anyways sorta off topic sorry.

core · 05-16-2010, 09:11 PM

Currently I have Raytheon Grey Plates and an RCA high gain tube low noise 7025 in my 2204 and they are badass. We did a comparison in the studio yesterday at a good volume. Bbetween that, my 900 (with similar tubes) and a JMP-1. The JMP 2204 was so much warmer than the other two it was night and day not to mention the clarity even with the gain on 10. The JMP-1 was pretty close but had to be tweaked to get a good tone. The stock presets didn't hold up. Also what amazed me about the 2204 and maybe the tubes helped but the tone held up perfectly at whatever volume I had it at and kept the clarity. Those are my current favorites for that amp.

Las Palmas Norte · 05-17-2010, 12:32 PM

Excellent! I'll keep that in mind if I decide to swap out the tubes. Thanks.

Cheers, Barrie.

pinto79 · 06-04-2010, 09:08 PM

The CSA JMPs and JCM800s wore the metal switches well into the 80s. I've had several of them from 1978 to 1984 and they all had the metal toggles.

I don't know when the cosmetics changed as my JMP was a 78 and my oldest JCM800 was a 1982 if memory serves.

kanders1 · 06-09-2010, 03:55 PM

Apparently cosmetics and guts were all over the place in the mid to late 70's. I'm still trying to figure out my '77 MK II; please look at 1977 MKII 50W: What exactly is it?

Kevin

core · 06-09-2010, 04:01 PM

1976 was the crossover period for the Small Box to Big Box Check this link here. The first two are only about 3300 numbers off from each other where one is the older box and the other the later box.
Amp Archives/Marshall/100 Watt Series 1965-1981/2203 Master Volume 100W

dreyn77 · 06-04-2012, 05:37 AM

Gosh, people use to be so helpful in this forum! cheers! WHy do people sell JMP's and then regrett it?

dreyn77 · 06-05-2012, 10:36 AM

THIN LIZZY had these amps on 'top off the pops' tv show back in the day! And how good we're they?

04-24-2010, 03:49 AM	#2 (permalink)
Mike B Junior Member Join Date: Jul 2009 Posts: 9	Re: JMP info It might be very early master model. I've heard about some 2204 and 2203 made with these switches instead of JCM ones in the very beginning of production. radiomatts likes this.

04-24-2010, 01:14 PM	#3 (permalink)
core Senior Member Join Date: Dec 2009 Posts: 1,321	Re: JMP info To me it appears to be a later JMP Master as they didn't start putting the serial number on the front until 79. What is the letter on the serial number? K = '78, L = '79, M = '80. From the sticker on the back it has the CSA, Canadian Standards logo. JCM 800's have the metal toggles for Canadian export I believe as well. Also it has pointer knobs which I think were later 70's early 80's JMP/JCM from what I've seen. So late 70's Canadian export 50 watt (2204) is my guess. __________________ ♠ ♠ ♠ ♠ ♠ ♠ ♠ ♠ ♠ Aces & 8's

04-24-2010, 08:14 PM	#4 (permalink)
Las Palmas Norte Senior Member Join Date: Apr 2010 Location: Lantzville, Vancouver Island Posts: 1,338	Re: JMP info Yes ... it has the CSA (Canadian Standards Association) logo and some minimal bilingual (french) stenciling on the rear jack panel. It was sold as a 50 watt head back then, so it confirms this fact. The serial number is O4*9N stamped on the gold front panel underneath the red "power on" light. Cheers and thanks, Barrie. __________________ Rock n' Blues ... you'll never lose. Last edited by Las Palmas Norte; 04-24-2010 at 10:15 PM.*

04-25-2010, 01:03 PM	#6 (permalink)
janarn Senior Member Join Date: Aug 2008 Posts: 961	Re: JMP info JMP export amps were made for three more years.

05-11-2010, 07:52 PM	#10 (permalink)
Las Palmas Norte Senior Member Join Date: Apr 2010 Location: Lantzville, Vancouver Island Posts: 1,338	Re: JMP info Speaking of tube swaps, any supplier recommendations, on line or not? (perhaps worthy of a separate thread?) If your's is a Canadian model there's going to be some French stenciling on the rear jack panel. Mine is something I doubt I'll ever part with. As you say, "a beast" with some serious delivery all around. Cheers, Barrie. __________________ Rock n' Blues ... you'll never lose.

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05-14-2010, 01:21 AM	#11 (permalink)
Viking62 Senior Member Join Date: Mar 2010 Location: Sydney Posts: 259	Re: JMP info Strange that its an 81 model with those older power switches. I had a JMP2203 Master. A 1979 build and it had the larger chunky switches, but maybe that was just common to Australia at the time? __________________ You can Shout and make no sense or Whisper up a Storm YJM100 Marshall Major 1959 SLP JCM800 2203 1960A 1960AX 1960BX 1960BX

05-14-2010, 01:33 AM	#12 (permalink)
Las Palmas Norte Senior Member Join Date: Apr 2010 Location: Lantzville, Vancouver Island Posts: 1,338	Re: JMP info Maybe Marshall was clearing out the last from the parts bins and Canada got stuck with the old metal toggle switches that year? __________________ Rock n' Blues ... you'll never lose.

05-15-2010, 01:03 PM	#13 (permalink)
emitch.sr Member Join Date: May 2010 Posts: 81	Re: JMP info I have an 80 JMP 2203 and it has the square switches also. Do you guys have any suggestions for pre amp tubes? I am thinking of swapping mine out and trying something else but don't know where to start. I've seen some who use different tubes in different positions v1-v2?? I don't know if I would screw something up by just trying different brand tubes in different places?

05-15-2010, 10:15 PM	#15 (permalink)
rykus Senior Member Join Date: Sep 2008 Posts: 126	Re: JMP info check out the pre amp tube forum for anything about any type, its llllooooonnnggg but theres many pages of worthwhle tips and suggestions. but all depends what you want to hear. i like mullard and the amprex/valvo they are darker and less treble, i found telefunken tooo bright and rca more gainy anyways sorta off topic sorry.

05-16-2010, 09:11 PM	#16 (permalink)
core Senior Member Join Date: Dec 2009 Posts: 1,321	Re: JMP info Currently I have Raytheon Grey Plates and an RCA high gain tube low noise 7025 in my 2204 and they are badass. We did a comparison in the studio yesterday at a good volume. Bbetween that, my 900 (with similar tubes) and a JMP-1. The JMP 2204 was so much warmer than the other two it was night and day not to mention the clarity even with the gain on 10. The JMP-1 was pretty close but had to be tweaked to get a good tone. The stock presets didn't hold up. Also what amazed me about the 2204 and maybe the tubes helped but the tone held up perfectly at whatever volume I had it at and kept the clarity. Those are my current favorites for that amp. __________________ ♠ ♠ ♠ ♠ ♠ ♠ ♠ ♠ ♠ Aces & 8's

05-17-2010, 12:32 PM	#17 (permalink)
Las Palmas Norte Senior Member Join Date: Apr 2010 Location: Lantzville, Vancouver Island Posts: 1,338	Re: JMP info Excellent! I'll keep that in mind if I decide to swap out the tubes. Thanks. Cheers, Barrie. __________________ Rock n' Blues ... you'll never lose.

06-04-2010, 09:08 PM	#18 (permalink)
pinto79 Senior Member Join Date: Aug 2008 Location: Delta, B.C., Canada Posts: 473	Re: JMP info The CSA JMPs and JCM800s wore the metal switches well into the 80s. I've had several of them from 1978 to 1984 and they all had the metal toggles. I don't know when the cosmetics changed as my JMP was a 78 and my oldest JCM800 was a 1982 if memory serves. __________________ My Marshall Gear: 1992 JMP-1 Valve MIDI Preamp 1992 6960A Cabinet loaded with G12T-75s 2008 1959RR Randy Rhoads Signature 2010 1960BC Cabinet in White Loaded with G12M-25 Greenbacks Old, beaten 1960A loaded with G12M-25 Greenbacks

06-09-2010, 03:55 PM	#19 (permalink)
kanders1 Senior Member Join Date: Feb 2010 Location: Houston, TX Posts: 152	Re: JMP info Apparently cosmetics and guts were all over the place in the mid to late 70's. I'm still trying to figure out my '77 MK II; please look at 1977 MKII 50W: What exactly is it? Kevin

06-09-2010, 04:01 PM	#20 (permalink)
core Senior Member Join Date: Dec 2009 Posts: 1,321	Re: JMP info 1976 was the crossover period for the Small Box to Big Box Check this link here. The first two are only about 3300 numbers off from each other where one is the older box and the other the later box. Amp Archives/Marshall/100 Watt Series 1965-1981/2203 Master Volume 100W __________________ ♠ ♠ ♠ ♠ ♠ ♠ ♠ ♠ ♠ Aces & 8's

06-04-2012, 05:37 AM	#21 (permalink)
dreyn77 Banned Join Date: Feb 2012 Posts: 996	Re: JMP info Gosh, people use to be so helpful in this forum! cheers! WHy do people sell JMP's and then regrett it?

06-05-2012, 10:36 AM	#22 (permalink)
dreyn77 Banned Join Date: Feb 2012 Posts: 996	Re: JMP info THIN LIZZY had these amps on 'top off the pops' tv show back in the day! And how good we're they?

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