JMP Plexi?

Jenovaslegacy · 09-30-2009, 02:47 PM

Hi all,

I'm new to the forum, and looking for some help.

About a year and a half ago a now (thankfully ex) girlfriend gave me an amplifier that her Dad had 'lying around' in his garage for my birthday, knowing that I'd always wanted a proper Marshall valve-driven head. Up until then I'd been using a crappy MGSII Micro Stack, though only for bedroom guitaring it should be noted

I've since formed a band and have received a lot of attention for this head, and only recently begun to research its model and origins. It seems that I have a JMP Plexi (unsure of the year)on my hands. I was surprised and pleased to find out that these are now quite collectible and am interested in finding out in which year it was made. I've been playing it in gig situations for about a year now and it doesn't misss a trick. Not to mention its f**king loud!!! I have got the serial number from the back and have approached Marshall about it but never seem to be able to get through to the right guy (been trying for weeks).

The amp in question is on my picture. Sorry about the poor quality. I need to have the back off and check the internals, but like I said, it doesn't miss a trick normally. I am toying with the idea of moving it on if I can get the right price for it...

***Adwex*** · 09-30-2009, 03:35 PM

Welcome to the forum.
Post the serial number, I'm sure someone here can help identify it.

Frankie · 09-30-2009, 04:07 PM

Snap, that's definitely a 100 watter, look at the size of that head box! Post more pics, especially gut shots. If I see the circuit, I can tell you what you've got there, i.e. Super Lead, Super Bass, etc... Is the front panel made of plexiglas or metal?

Jenovaslegacy · 09-30-2009, 05:55 PM

I've never had the back off and being quite unskilled in such things I'd be quite nervy about doing so, but I'll see what I can do about some internal shots. Most of the other ones have a little information board nailed to the back, but somewhere along the line this one has lost that. Are you talking about the front panel as seen from the inside?

The serial is S/A 5541C. Apparently if it is an alpha letter that means its '69 or prior?

shawkey · 09-30-2009, 07:22 PM

sorry to hear that you've already had the best b/day of your life

janarn · 10-01-2009, 09:18 AM

A 50w from '71 is what the serialnumber tells me,
without looking at the amp.

Jenovaslegacy · 10-01-2009, 11:46 AM

These would be generally handwired wouldn't they?

Frankie · 10-01-2009, 11:57 AM

Quote:

Originally Posted by Jenovaslegacy

These would be generally handwired wouldn't they?

Marshall didn't move to circuit boards until '73, so yeah, that's definitely hand wired.

Jenovaslegacy · 10-01-2009, 11:58 AM

I'm working on some internal shots for you guys, I appreciate your help. What would be a reasonable asking price to teh right buyer do your reckon, assuming all the internals are in order and service is up to date?

***Adwex*** · 10-01-2009, 02:08 PM

The only reason to consider selling this amp is if you need the money to pay for food or rent.

Jenovaslegacy · 10-01-2009, 03:01 PM

Ha, yeah I feel shameful. Unfortunately you're not far off, I'm moving into a new place next month and if I'm siting on a small fortunes worth of equipment I simply cannot afford to hold onto it. Breaks my heart but I've got a replacement rig lined up that should be good enough for my style of play should I be able to get a decent price.

I attached some pics of the rest of the exterior if they're any help to anyone. Would have opened her up but can't find the f*%@in screwdriver! Yep, I'm that gash.

Whats the best way to go about getting it valued wiothout approaching Marshall directly? Like I said, I've been trying for ages with absolutely zero success.

Jenovaslegacy · 10-01-2009, 03:03 PM

A few more of the front

Marshallhead · 10-01-2009, 06:23 PM

It isn't a Plexi (that term refers to the 60's amps with the plastic control panels), it's a 50 watt Lead model, stock number 1987, and the serial letter denoting year is the C following the 4 digit number, C being 1971.

Frankie · 10-01-2009, 09:18 PM

An early metal panel should fetch like $2500-$3000 I believe, but don't quote me on it. They're considered pretty valuable still.

Jenovaslegacy · 10-03-2009, 08:07 AM

Thanks guys. I'm takin it down to Bletchley for service soon, will have the back off so you can pore over the entrails though before I do.

MajorNut1967 · 10-03-2009, 11:51 AM

Quote:

Originally Posted by janarn

A 50w from '71 is what the serialnumber tells me,
without looking at the amp.

Again this is correct!

rockinr0ll · 10-03-2009, 12:12 PM

Your GF gave you a $2,000 (dollar) birthday present what a keeper!

It's for sure a 1971 (as the C stands for '71).

That is a bad ass amp! Be careful gigging with it though, a lot of people will try to steal that.

Ken · 10-05-2009, 06:36 PM

Quote:

Originally Posted by rockinr0ll

Your GF gave you a $2,000 (dollar) birthday present what a keeper!

It's for sure a 1971 (as the C stands for '71).

That is a bad ass amp! Be careful gigging with it though, a lot of people will try to steal that.

I don't know the value, but as many new amps cost $2k or more, and that's close to the list of a JVM, I'm surprised this one is "only" worth $2k...that seems like quite a bargain for anyone buying it!

Ken

Jenovaslegacy · 10-07-2009, 03:01 AM

This is what I am hoping. Having looked around the net at various sites and seeing them for sale they look to go for a range of prices between £1200 to £4000, I suppose this variation is condition dependent, and whether the internals are original and in good condition.

Still haven't found the screwdriver!

MajorNut1967 · 10-07-2009, 03:16 AM

Great amp there mate!
Cheers

steelhorse · 10-07-2009, 07:05 AM

Amazing amp!

poeman33 · 10-07-2009, 12:12 PM

Don't sell it. It was a gift, so it's not like it is costing you anything to own it. You'll never be able to replace it. If it was me I'd find some other way of getting extra cash if you need it right now.

Jenovaslegacy · 10-12-2009, 05:13 AM

In a bizarre twist of coincidence, I decided to use the cab at the sudio at our last practice instead of using my own rather shitty piece of kit, and to be quite honet I was blown the hell away. This is teh first time this amp has been used through a proper cab, at least by me, and it really shone through, the tone was simply gorgeous. I am now very much in two midns as to whether to sell it, or to invest in it with a good service and a proper cab. Can anybody recommend which cab suits these amps best?

janarn · 10-12-2009, 09:55 AM

Best cab for that amp is a 4x12" Basketweave cab with G12M 25w
and Pulsonic cones. A BW cab with G12H's will also sound great.

Jenovaslegacy · 10-12-2009, 11:48 AM

They're Celestions right, greenbacks? The actual cab I was using was a bit of a hybrid cos the original speakers had got lost but the guy at the Studio had chucked some new ones in. I did ask him if it was up for sale but he said it wasn't his and the guy who owns it probably would want to sell it but given that he'd have to take his speakers out of it first that would leave me with one speaker and a load of wood. So I'm thinking of investing in one.

How would an MG412 stand up under this amp?

HOT TUBES 70 · 10-17-2009, 06:07 PM

Quote:

Originally Posted by poeman33

Don't sell it. It was a gift, so it's not like it is costing you anything to own it. You'll never be able to replace it. If it was me I'd find some other way of getting extra cash if you need it right now.

i know your in need of cash , but Poemans got it right , you will never see
another one like and in this condition , DON'T SELL IT ! what you have is
a little jem of rock history . and it was mentioned above as well that its
a very collectable amp people will think about ripping it off !!! be careful
with it man .

good luck

thrawn86 · 10-17-2009, 06:39 PM

Quote:

Originally Posted by Jenovaslegacy

They're Celestions right, greenbacks? The actual cab I was using was a bit of a hybrid cos the original speakers had got lost but the guy at the Studio had chucked some new ones in. I did ask him if it was up for sale but he said it wasn't his and the guy who owns it probably would want to sell it but given that he'd have to take his speakers out of it first that would leave me with one speaker and a load of wood. So I'm thinking of investing in one.

How would an MG412 stand up under this amp?

I've said it before, If you can match impedences you can do it....but listening to that amp go through that cab is like drinking the finest champagne you'll ever have......out of a cheap foam cup.

Definitely get something worthwhile for her!

G60_dave · 10-17-2009, 06:48 PM

Dont be stupid and sell that. Ive been stupid enough to sell a 64 JTM45, a 62 ac30, many old fenders and hiwatts, Parks and only now realise Id be a wealthy man if I hadnt sold that stuff for what was a 'good price at the time'.
Like gold bars or LPs. Itll never depreciate!

george76 · 10-17-2009, 07:11 PM

The very early 70's amps are getting more desirable thesedays. The price of the 60's plexi's are getting higher and harder to find so people are going for the early 70's ones, as they are more affordable. I wouldnt mind a 50 watter myself.

If you do decide to sell it get someone to look over it to see if its all original or not as that will increase the price.

Check out this thread...

http://forums.vintageamps.com/viewtopic.php?f=1&t=87163

Jenovaslegacy · 10-19-2009, 08:58 AM

Quote:

Originally Posted by HOT TUBES 70

i know your in need of cash , but Poemans got it right , you will never see
another one like and in this condition , DON'T SELL IT ! what you have is
a little jem of rock history . and it was mentioned above as well that its
a very collectable amp people will think about ripping it off !!! be careful
with it man .

good luck

Thanks, I have taken the advice of the many knowledgable people on here and have opted to hold onto it in the face of such overwhelming opposition to moving it on!

I invested in a JCM 900 Cab but am now having tone problems, jump to the 'JMP + 1960b' thread on here if you think you can help me out with that!

But thanks to all who gave words of encouragement and excellent advice. If I can just get my sound to where I need it to be I'll be cookin'!

09-30-2009, 02:47 PM	#1 (permalink)
Jenovaslegacy Member Join Date: Sep 2009 Location: Midlands, UK Posts: 45	JMP Plexi? Hi all, I'm new to the forum, and looking for some help. About a year and a half ago a now (thankfully ex) girlfriend gave me an amplifier that her Dad had 'lying around' in his garage for my birthday, knowing that I'd always wanted a proper Marshall valve-driven head. Up until then I'd been using a crappy MGSII Micro Stack, though only for bedroom guitaring it should be noted I've since formed a band and have received a lot of attention for this head, and only recently begun to research its model and origins. It seems that I have a JMP Plexi (unsure of the year)on my hands. I was surprised and pleased to find out that these are now quite collectible and am interested in finding out in which year it was made. I've been playing it in gig situations for about a year now and it doesn't misss a trick. Not to mention its f**king loud!!! I have got the serial number from the back and have approached Marshall about it but never seem to be able to get through to the right guy (been trying for weeks). The amp in question is on my picture. Sorry about the poor quality. I need to have the back off and check the internals, but like I said, it doesn't miss a trick normally. I am toying with the idea of moving it on if I can get the right price for it...

09-30-2009, 03:35 PM	#2 (permalink)
*Adwex* Super Moderator Join Date: Sep 2006 Location: Long Island, NY Posts: 1,631	Re: JMP Plexi? Welcome to the forum. Post the serial number, I'm sure someone here can help identify it. __________________ http://www.youtube.com/MarshallLesPaul

09-30-2009, 04:07 PM	#3 (permalink)
Frankie Senior Member Join Date: Sep 2007 Location: Clearwater, FL Posts: 362	Re: JMP Plexi? Snap, that's definitely a 100 watter, look at the size of that head box! Post more pics, especially gut shots. If I see the circuit, I can tell you what you've got there, i.e. Super Lead, Super Bass, etc... Is the front panel made of plexiglas or metal? __________________ w w w . c o w b o y m a f i a . n e t Myspace.com \| YouTube \| Facebook

09-30-2009, 05:55 PM	#4 (permalink)
Jenovaslegacy Member Join Date: Sep 2009 Location: Midlands, UK Posts: 45	Re: JMP Plexi? I've never had the back off and being quite unskilled in such things I'd be quite nervy about doing so, but I'll see what I can do about some internal shots. Most of the other ones have a little information board nailed to the back, but somewhere along the line this one has lost that. Are you talking about the front panel as seen from the inside? The serial is S/A 5541C. Apparently if it is an alpha letter that means its '69 or prior?

09-30-2009, 07:22 PM	#5 (permalink)
shawkey Member Join Date: Sep 2009 Location: philly pa Posts: 36	Re: JMP Plexi? sorry to hear that you've already had the best b/day of your life

10-01-2009, 09:18 AM	#6 (permalink)
janarn Senior Member Join Date: Aug 2008 Posts: 408	Re: JMP Plexi? A 50w from '71 is what the serialnumber tells me, without looking at the amp.

10-01-2009, 11:46 AM	#7 (permalink)
Jenovaslegacy Member Join Date: Sep 2009 Location: Midlands, UK Posts: 45	Re: JMP Plexi? These would be generally handwired wouldn't they?

10-01-2009, 11:58 AM	#9 (permalink)
Jenovaslegacy Member Join Date: Sep 2009 Location: Midlands, UK Posts: 45	Re: JMP Plexi? I'm working on some internal shots for you guys, I appreciate your help. What would be a reasonable asking price to teh right buyer do your reckon, assuming all the internals are in order and service is up to date?

10-01-2009, 02:08 PM	#10 (permalink)
*Adwex* Super Moderator Join Date: Sep 2006 Location: Long Island, NY Posts: 1,631	Re: JMP Plexi? The only reason to consider selling this amp is if you need the money to pay for food or rent. __________________ http://www.youtube.com/MarshallLesPaul

10-01-2009, 06:23 PM	#13 (permalink)
Marshallhead Junior Member Join Date: Jun 2009 Posts: 24	Re: JMP Plexi? It isn't a Plexi (that term refers to the 60's amps with the plastic control panels), it's a 50 watt Lead model, stock number 1987, and the serial letter denoting year is the C following the 4 digit number, C being 1971.

10-01-2009, 09:18 PM	#14 (permalink)
Frankie Senior Member Join Date: Sep 2007 Location: Clearwater, FL Posts: 362	Re: JMP Plexi? An early metal panel should fetch like $2500-$3000 I believe, but don't quote me on it. They're considered pretty valuable still. __________________ w w w . c o w b o y m a f i a . n e t Myspace.com \| YouTube \| Facebook

10-03-2009, 08:07 AM	#15 (permalink)
Jenovaslegacy Member Join Date: Sep 2009 Location: Midlands, UK Posts: 45	Re: JMP Plexi? Thanks guys. I'm takin it down to Bletchley for service soon, will have the back off so you can pore over the entrails though before I do.

10-03-2009, 12:12 PM	#17 (permalink)
rockinr0ll Senior Member Join Date: Feb 2009 Posts: 1,340	Re: JMP Plexi? Your GF gave you a $2,000 (dollar) birthday present what a keeper! It's for sure a 1971 (as the C stands for '71). That is a bad ass amp! Be careful gigging with it though, a lot of people will try to steal that.

10-07-2009, 03:01 AM	#19 (permalink)
Jenovaslegacy Member Join Date: Sep 2009 Location: Midlands, UK Posts: 45	Re: JMP Plexi? This is what I am hoping. Having looked around the net at various sites and seeing them for sale they look to go for a range of prices between £1200 to £4000, I suppose this variation is condition dependent, and whether the internals are original and in good condition. Still haven't found the screwdriver!

10-07-2009, 03:16 AM	#20 (permalink)
MajorNut1967 Senior Member Join Date: Jul 2009 Location: South Pacific Posts: 709	Re: JMP Plexi? Great amp there mate! Cheers __________________ MJN1967 aka BA (Bad Attitude) 1968 model 1987 50watt. A Baby Major (Half-Power) I built from the ground up. JTM 45 Clone combo Ground up build. JCM 800 Clone Ground up build. Custom Built Warmoth Strat 75' Fender Tele-Deluxe '70 style strat custom build w/Custom Shop 69's PU's

10-07-2009, 07:05 AM	#21 (permalink)
steelhorse Senior Member Join Date: May 2008 Posts: 3,886	Re: JMP Plexi? Amazing amp! __________________ www.ricojronline.com 760-956-6619 Garmopat Pedal Mods "I wouldn't mind hearing your head smash through a glass door. That would be cool..." luekmeyer

10-07-2009, 12:12 PM	#22 (permalink)
poeman33 Senior Member Join Date: May 2008 Location: Ontario, Canada Posts: 432	Re: JMP Plexi? Don't sell it. It was a gift, so it's not like it is costing you anything to own it. You'll never be able to replace it. If it was me I'd find some other way of getting extra cash if you need it right now. __________________ --------------- Marshall JCM2000 DSL50 Avatar Vintage 4x12 cab Fender American Deluxe HSS Strat Ash body

10-12-2009, 05:13 AM	#23 (permalink)
Jenovaslegacy Member Join Date: Sep 2009 Location: Midlands, UK Posts: 45	Re: JMP Plexi? In a bizarre twist of coincidence, I decided to use the cab at the sudio at our last practice instead of using my own rather shitty piece of kit, and to be quite honet I was blown the hell away. This is teh first time this amp has been used through a proper cab, at least by me, and it really shone through, the tone was simply gorgeous. I am now very much in two midns as to whether to sell it, or to invest in it with a good service and a proper cab. Can anybody recommend which cab suits these amps best?

10-12-2009, 09:55 AM	#24 (permalink)
janarn Senior Member Join Date: Aug 2008 Posts: 408	Re: JMP Plexi? Best cab for that amp is a 4x12" Basketweave cab with G12M 25w and Pulsonic cones. A BW cab with G12H's will also sound great.

10-12-2009, 11:48 AM	#25 (permalink)
Jenovaslegacy Member Join Date: Sep 2009 Location: Midlands, UK Posts: 45	Re: JMP Plexi? They're Celestions right, greenbacks? The actual cab I was using was a bit of a hybrid cos the original speakers had got lost but the guy at the Studio had chucked some new ones in. I did ask him if it was up for sale but he said it wasn't his and the guy who owns it probably would want to sell it but given that he'd have to take his speakers out of it first that would leave me with one speaker and a load of wood. So I'm thinking of investing in one. How would an MG412 stand up under this amp?

10-17-2009, 06:48 PM	#28 (permalink)
G60_dave Junior Member Join Date: Mar 2009 Location: Wirral UK Posts: 21	Re: JMP Plexi? Dont be stupid and sell that. Ive been stupid enough to sell a 64 JTM45, a 62 ac30, many old fenders and hiwatts, Parks and only now realise Id be a wealthy man if I hadnt sold that stuff for what was a 'good price at the time'. Like gold bars or LPs. Itll never depreciate!

10-17-2009, 07:11 PM	#29 (permalink)
george76 Member Join Date: Aug 2009 Posts: 74	Re: JMP Plexi? The very early 70's amps are getting more desirable thesedays. The price of the 60's plexi's are getting higher and harder to find so people are going for the early 70's ones, as they are more affordable. I wouldnt mind a 50 watter myself. If you do decide to sell it get someone to look over it to see if its all original or not as that will increase the price. Check out this thread... http://forums.vintageamps.com/viewtopic.php?f=1&t=87163

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