MarshallForum.com
 
Go Back   MarshallForum.com > The Amps > Marshall Amps
LIKE MarshallForum on Facebook FOLLOW MarshallForum on Twitter
  
Like Tree16Likes

Reply
LinkBack Thread Tools Display Modes
Unread 12-22-2012, 11:23 PM   #1 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
1981 JMP Combo, More Pictures

Bought this amp last Sunday and posted a few pictures from my I-phone in another thread, thought that I would add some better pictures from my camera.

Still hard to believe that this amp is 31+ years old.
Attached Images
File Type: jpg DSC01901.jpg (96.2 KB, 85 views)
File Type: jpg DSC01897.jpg (96.6 KB, 74 views)
File Type: jpg DSC01893.jpg (98.8 KB, 68 views)
File Type: jpg DSC01883.jpg (96.4 KB, 66 views)
BURSTBUCKERBLACK and RussBert like this.
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster
jcm800gridlock is offline   Reply With Quote
Alt Today
Marshall Amps

Beitrag Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on MarshallForum.com
   
Unread 12-23-2012, 01:53 AM   #2 (permalink)
Senior Member
 
LPMarshall hack's Avatar
 
Join Date: Nov 2009
Location: San Diego, CA
Posts: 5,526
Re: 1981 JMP Combo, More Pictures

That is friggin awesome. I bet that thing sounds efffing sweeeet! Heavy as shit tho...
__________________
2500
1960BC
Peavey Vypyr 15
1989 LP Custom
Piece of crap Epi LP-100
LPMarshall hack is offline   Reply With Quote
Unread 12-23-2012, 02:07 AM   #3 (permalink)
Senior Member
 
richieG's Avatar
 
Join Date: Jul 2009
Posts: 1,835
Re: 1981 JMP Combo, More Pictures

Nice man.

I always wanted one of those as a grab and go amp.

I bet it sounds rad.
richieG is offline   Reply With Quote
Unread 12-23-2012, 03:43 AM   #4 (permalink)
Senior Member
 
Wiking's Avatar
 
Join Date: Sep 2011
Location: Deventer, Nederland
Posts: 304
Re: 1981 JMP Combo, More Pictures

Happy nad, dude. Amp looks great. I happen to have a 81 version myself. Very nice sound.
__________________
Wiking is offline   Reply With Quote
Unread 12-23-2012, 07:08 AM   #5 (permalink)
Senior Member
 
plexilespaul's Avatar
 
Join Date: Dec 2010
Posts: 1,773
Re: 1981 JMP Combo, More Pictures

nice it looks so classic
__________________
MARSHALLS FOR LIFE


jcm 800 2203 83
jcm 800 4*12 cab with g12-65
plexilespaul is offline   Reply With Quote
Unread 12-23-2012, 08:01 AM   #6 (permalink)
Senior Member
 
Rozman62's Avatar
 
Join Date: Nov 2010
Posts: 677
Re: 1981 JMP Combo, More Pictures

Nice pickup. I was hunting for one of these for months. I gave up and bought an Orange.
__________________
Guitars-Fender, Gibson, Epiphone, Ibanez, Schecter, Talkamine, Yamaha.

Amps-Marshall, Orange, Fender, Blackstar, GK.

Cabs: Marshall, Orange, Mesa, Avatar.
Rozman62 is offline   Reply With Quote
Unread 12-23-2012, 09:36 AM   #7 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
Re: 1981 JMP Combo, More Pictures

Thanks guys.

The amp really sounds great. I amp planning on taking it to my tech over the holidays just to make sure all is good (bias etc). All stock inside with Groove Tube 6550's in it. I have never heard anything good about Groove Tubes, should I swap the tubes out with a better brand? Any Suggestions? Still sounds good but since it will be with the tech now is the time to swap.

I played the JMP yesterday with both my Les Paul and Tele, and I can get Led Zeppelin/AC DC tones all day long without even trying. You definitely don't need an OD pedal with this amp. Even with the Tele which is now my favorite guitar. Plenty of OD and good cleans backing off the preamp.

A month ago I sold a 1983 JCM 800 (4104 50w) combo and the sounds are similar but still different. With the 800 I was at band volumes with the master set to 2, this amp the master needs to set be to 3 to be there.

I believe that am the third owner of this JMP, the second owner was a bass player who tried guitar shortly and then kept the amp in his closet for years. The amp is super quite, with no hums or scratchy pots, and even the On/Off and Standby switches still feel new with a click when you toggle them.

So far a great find at a great price.

Thanks for the kind words.
Doug
BURSTBUCKERBLACK likes this.
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster

Last edited by jcm800gridlock; 12-23-2012 at 02:20 PM.
jcm800gridlock is offline   Reply With Quote
Unread 12-23-2012, 10:08 AM   #8 (permalink)
Senior Member
 
Join Date: Apr 2012
Location: Atlanta, GA
Posts: 1,755
Re: 1981 JMP Combo, More Pictures

That thing's awesome looking. I haven't seen a whole lot of top loaded Marshall's. Bet it sounds great. Enjoy.
BURSTBUCKERBLACK likes this.
Darth Federer is offline   Reply With Quote
Unread 12-23-2012, 10:31 AM   #9 (permalink)
Senior Member
 
Join Date: Dec 2012
Location: nj
Posts: 709
Re: 1981 JMP Combo, More Pictures

Wow...that's a beauty! Enjoy!
BURSTBUCKERBLACK likes this.
flyinguitars is offline   Reply With Quote
Unread 12-23-2012, 12:39 PM   #10 (permalink)
Senior Member
 
eastwood6's Avatar
 
Join Date: May 2011
Posts: 264
Re: 1981 JMP Combo, More Pictures

To the guy who said that's a good grab and go amp - dude, you've never tried to grab and go anywhere fast with one of these bad boys! It weighs like 85 pounds with a single tiny little vinyl handle on the top. You can really hurt yourself if not careful!

I owned a '81 2104 until recently, and had a '78 bought new back in the day. Beautiful, old school construction and sound, but ultimately I couldn't deal with the beastly weight and the open-back combo tone - Marshall crunch sounds best to me with the thump from a closed back cab. But that's just me. I still have a warm spot for those combos. Good luck and enjoy.
__________________
Marshall 3203 Artist 30 head
Marshall 1965 A & B 4 x 10" cabs
Marshall C5H Class5 head
Fender '65 Deluxe Reverb Reissue
1977 Gibson Les Paul Deluxe
1996 Fender American Standard Stratocaster
eastwood6 is offline   Reply With Quote
Unread 12-23-2012, 02:10 PM   #11 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by eastwood6 View Post
To the guy who said that's a good grab and go amp - dude, you've never tried to grab and go anywhere fast with one of these bad boys! It weighs like 85 pounds with a single tiny little vinyl handle on the top. You can really hurt yourself if not careful!

I owned a '81 2104 until recently, and had a '78 bought new back in the day. Beautiful, old school construction and sound, but ultimately I couldn't deal with the beastly weight and the open-back combo tone - Marshall crunch sounds best to me with the thump from a closed back cab. But that's just me. I still have a warm spot for those combos. Good luck and enjoy.
My first Marshall was a brand new 1977 JMP 100 watt Master Volume Head and Half stack back when I was in my early 20’s and I still want another 50 watt JMP Head from the late 70’s. I actually purchased a 1977 JMP 50 watt Head from Guitar Center Vintage at the same time as I bought the combo. The head was in nice shape but it turned out to be an early (Feb) 1977 model and it did not have the cascading gain revision that was new to the 50 watt JMP amps and was supposedly incorporated in Feb, 1977. Not the case here.

I returned the Head back to Guitar Center within the 3 day return period because it had virtually no gain until the master was up to 5 (too loud for me) even with the preamp maxed to 10.

I am still in the market for a late 1977-79 50 watt JMP MK2 Master when I find an original one still with 6550's at a fair price. Guess I am going back to my roots.

Actually the combo is not that bad to move yet and my back is still pretty good shape. The JMP combo seems much lighter than my 1966 Blackface Fender Twin Reverb and also lighter than my 1983 JCM 800 4104 combo and I can move the combo around the house on a furniture dolly when I am feeling lazy.
BURSTBUCKERBLACK likes this.
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster
jcm800gridlock is offline   Reply With Quote
Unread 12-23-2012, 02:57 PM   #12 (permalink)
Senior Member
 
SkinnyJ's Avatar
 
Join Date: Mar 2012
Location: Manchester, NH
Posts: 517
Re: 1981 JMP Combo, More Pictures

That's a cool amp. I would love to get my hands on a pre-800 50 watter. I have a '84 800 4104. "Grab-n-go", these combos certainly aren't. My shoulder joint can testify to that.
__________________
'84 Marshall JCM800 4104
Blackstar HT-20
Marshall Class 5
ADA MP-1 (Version 1)
1987 Les Paul Standard
2009 American Standard Strat
Takamine EG531SC Acoustic

My Band: Fistful of Karma
SkinnyJ is offline   Reply With Quote
Unread 12-25-2012, 07:27 AM   #13 (permalink)
Senior Member
 
eastwood6's Avatar
 
Join Date: May 2011
Posts: 264
Re: 1981 JMP Combo, More Pictures

Wow. Was browsing eBay last night waiting for Santa and noticed that the guy who bought my '81 2104 JMP mentioned earlier in this thread has it up for sale. It was in mint condition when I sold it and it looks to still be that way.


http://http://www.ebay.com/itm/Vintage-marshall-jmp-2104-combo-guitar-amp-/251202884595?pt=LH_DefaultDomain_0&hash=item3a7cdb d3f3
__________________
Marshall 3203 Artist 30 head
Marshall 1965 A & B 4 x 10" cabs
Marshall C5H Class5 head
Fender '65 Deluxe Reverb Reissue
1977 Gibson Les Paul Deluxe
1996 Fender American Standard Stratocaster
eastwood6 is offline   Reply With Quote
Unread 12-25-2012, 09:58 AM   #14 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by eastwood6 View Post
Wow. Was browsing eBay last night waiting for Santa and noticed that the guy who bought my '81 2104 JMP mentioned earlier in this thread has it up for sale. It was in mint condition when I sold it and it looks to still be that way.


http://http://www.ebay.com/itm/Vintage-marshall-jmp-2104-combo-guitar-amp-/251202884595?pt=LH_DefaultDomain_0&hash=item3a7cdb d3f3
Thanks for the info, your amp is also in very similar mint condition like mine.

I am glad to see that the JMP combos are maintaining value. There is currently a 1979 combo at GC vintage for $1400 that had been modded (holes etc).

I was lucky enough to find mine somewhat locally off of Craigslist at a price so right that I didn't even have to negotiate.

Merry Christmas and Happy Holidays!
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster
jcm800gridlock is offline   Reply With Quote
Unread 12-25-2012, 03:18 PM   #15 (permalink)
Senior Member
 
StratoMarshall's Avatar
 
Join Date: Mar 2012
Location: Tidewater, Virginia
Posts: 2,180
Re: 1981 JMP Combo, More Pictures

Very nice amp!
__________________
Scaring neighbors on a weekly Basis
_____________________________________

2005 JCM2000 TSL100

1978 JMP 2204
1960A w/G12T75's
MIM Strat SD Hotrail II in bridge pos.
Focusrite Saffire Pro24
PreSonus HP4
StratoMarshall is offline   Reply With Quote
Unread 12-26-2012, 12:27 AM   #16 (permalink)
Senior Member
 
Join Date: Dec 2012
Location: New Yawk
Posts: 175
Re: 1981 JMP Combo, More Pictures

That is a schweet amp! Enjoy!
Marshall Guru is offline   Reply With Quote
Unread 12-26-2012, 08:27 AM   #17 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
Re: 1981 JMP Combo, More Pictures

Taking the JMP to my tech today to have it looked over. No worries.

I really like the looks of the JMP combos and they apprear to be fairly rare.

I do wish that it had the checkerd grill cloth like the 70's models, but a keeper for sure.

Thanks
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster

Last edited by jcm800gridlock; 12-26-2012 at 09:20 PM.
jcm800gridlock is offline   Reply With Quote
Unread 12-26-2012, 11:50 AM   #18 (permalink)
Senior Member
 
Rozman62's Avatar
 
Join Date: Nov 2010
Posts: 677
Re: 1981 JMP Combo, More Pictures

Yes...rare enough for me to not secure one through a daily CL search in 3 states for 3 months straight. I actually did find one and the seller was willing to drive 90 miles to my house to drop it off for $1000. I went away that weekend...my loss. He sold it to someone in Calif for $1600 later that day.
__________________
Guitars-Fender, Gibson, Epiphone, Ibanez, Schecter, Talkamine, Yamaha.

Amps-Marshall, Orange, Fender, Blackstar, GK.

Cabs: Marshall, Orange, Mesa, Avatar.
Rozman62 is offline   Reply With Quote
Unread 12-26-2012, 09:19 PM   #19 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by Rozman62 View Post
Yes...rare enough for me to not secure one through a daily CL search in 3 states for 3 months straight. I actually did find one and the seller was willing to drive 90 miles to my house to drop it off for $1000. I went away that weekend...my loss. He sold it to someone in Calif for $1600 later that day.
Hang in there, they are out there.

Wow, $1600.00, is a lot more than I paid for this one.
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster
jcm800gridlock is offline   Reply With Quote
Unread 12-26-2012, 09:26 PM   #20 (permalink)
Senior Member
 
Join Date: Oct 2011
Posts: 164
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by Rozman62 View Post
Yes...rare enough for me to not secure one through a daily CL search in 3 states for 3 months straight. I actually did find one and the seller was willing to drive 90 miles to my house to drop it off for $1000. I went away that weekend...my loss. He sold it to someone in Calif for $1600 later that day.
hey dude this just came up. i was searshing for a powerbrake and this thing popped up. 77" 2x12

Marshall JMP 50w 2x12" Combo Amp - Vintage 1977
jcm800gridlock likes this.
Tim Semeryuk is offline   Reply With Quote
Unread 12-27-2012, 11:12 AM   #21 (permalink)
Senior Member
 
Rozman62's Avatar
 
Join Date: Nov 2010
Posts: 677
Re: 1981 JMP Combo, More Pictures

Thanks guys...revert back to post 6. I use a JMP 2204 now so I am not without that sweet JMP tone.
__________________
Guitars-Fender, Gibson, Epiphone, Ibanez, Schecter, Talkamine, Yamaha.

Amps-Marshall, Orange, Fender, Blackstar, GK.

Cabs: Marshall, Orange, Mesa, Avatar.
Rozman62 is offline   Reply With Quote
Unread 12-27-2012, 08:33 PM   #22 (permalink)
Senior Member
 
eastwood6's Avatar
 
Join Date: May 2011
Posts: 264
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by Tim Semeryuk View Post
hey dude this just came up. i was searshing for a powerbrake and this thing popped up. 77" 2x12

Marshall JMP 50w 2x12" Combo Amp - Vintage 1977
That old girl is in fine, fine shape. Reminds me of my old '78 2104. Identical to that one except didn't have the bits of piping on the top of the cabinet. Big booming tone, never was able to get it above 3 in the clubs we were playing back then. $1,400 is not a bad price for a '70's 2104 from that era in that condition. If I wasn't on the complete other end of the country I'd seriously think about it...
__________________
Marshall 3203 Artist 30 head
Marshall 1965 A & B 4 x 10" cabs
Marshall C5H Class5 head
Fender '65 Deluxe Reverb Reissue
1977 Gibson Les Paul Deluxe
1996 Fender American Standard Stratocaster
eastwood6 is offline   Reply With Quote
Unread 12-27-2012, 08:46 PM   #23 (permalink)
Senior Member
 
BURSTBUCKERBLACK's Avatar
 
Join Date: Mar 2012
Location: Tulsa, Oklahoma
Posts: 193
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by eastwood6 View Post
Wow. Was browsing eBay last night waiting for Santa and noticed that the guy who bought my '81 2104 JMP mentioned earlier in this thread has it up for sale. It was in mint condition when I sold it and it looks to still be that way.


http://http://www.ebay.com/itm/Vinta...item3a7cdbd3f3
Small world we live in My Marshall Brother I am the one who won that ebay auction. Used to have one back in 79 and allways regreted selling it oh so many years ago. Glad to get this deal at what I think is a fair price Now you know were it went just waiting for it to get here. I'll let ya know when I get it. It does look minty I must say.
BURSTBUCKERBLACK is offline   Reply With Quote
Unread 12-27-2012, 08:47 PM   #24 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by eastwood6 View Post
That old girl is in fine, fine shape. Reminds me of my old '78 2104. Identical to that one except didn't have the bits of piping on the top of the cabinet. Big booming tone, never was able to get it above 3 in the clubs we were playing back then. $1,400 is not a bad price for a '70's 2104 from that era in that condition. If I wasn't on the complete other end of the country I'd seriously think about it...
That amp is beautiful. I love old school piping on the top and the checkered grill cloth. I noticed that it did have EL34's in it so it has had some mods done to run with these tubes VS original 6550's.
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster
jcm800gridlock is offline   Reply With Quote
Unread 12-27-2012, 08:49 PM   #25 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by BURSTBUCKERBLACK View Post
Small world we live in My Marshall Brother I am the one who won that ebay auction. Used to have one back in 79 and allways regreted selling it oh so many years ago. Glad to get this deal at what I think is a fair price Now you know were it went just waiting for it to get here. I'll let ya know when I get it. It does look minty I must say.
Congrats, we have nearly identical amps.
BURSTBUCKERBLACK likes this.
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster
jcm800gridlock is offline   Reply With Quote
Unread 12-27-2012, 08:52 PM   #26 (permalink)
Senior Member
 
BURSTBUCKERBLACK's Avatar
 
Join Date: Mar 2012
Location: Tulsa, Oklahoma
Posts: 193
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by jcm800gridlock View Post
Bought this amp last Sunday and posted a few pictures from my I-phone in another thread, thought that I would add some better pictures from my camera.

Still hard to believe that this amp is 31+ years old.
Congrats!! Looks awesome and mint enjoy!
BURSTBUCKERBLACK is offline   Reply With Quote
Unread 12-27-2012, 09:05 PM   #27 (permalink)
Senior Member
 
eastwood6's Avatar
 
Join Date: May 2011
Posts: 264
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by BURSTBUCKERBLACK View Post
Small world we live in My Marshall Brother I am the one who won that ebay auction. Used to have one back in 79 and allways regreted selling it oh so many years ago. Glad to get this deal at what I think is a fair price Now you know were it went just waiting for it to get here. I'll let ya know when I get it. It does look minty I must say.
Happy to hear it's headed to a good home where it will be appreciated. It was a fine amp in excellent condition inside and out when I sold it. Had just had it gone through by one of the top Marshall techs in the Northeast before it shipped. These amps are very responsive to the types of pre amp tubes you use so it's fun to try different ones. I really liked a current production Electro-Harmonix 12AX7 in V1 in that 2104.

Let us know how you like the amp when you get it. Good luck!
__________________
Marshall 3203 Artist 30 head
Marshall 1965 A & B 4 x 10" cabs
Marshall C5H Class5 head
Fender '65 Deluxe Reverb Reissue
1977 Gibson Les Paul Deluxe
1996 Fender American Standard Stratocaster
eastwood6 is offline   Reply With Quote
Unread 12-28-2012, 08:43 AM   #28 (permalink)
Senior Member
 
jcm800gridlock's Avatar
 
Join Date: May 2010
Location: Tampa, Fl. USA
Posts: 913
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by eastwood6 View Post
Happy to hear it's headed to a good home where it will be appreciated. It was a fine amp in excellent condition inside and out when I sold it. Had just had it gone through by one of the top Marshall techs in the Northeast before it shipped. These amps are very responsive to the types of pre amp tubes you use so it's fun to try different ones. I really liked a current production Electro-Harmonix 12AX7 in V1 in that 2104.

Let us know how you like the amp when you get it. Good luck!
East,

I've owned tube amps for over thirty years but have not really played with swapping tubes or biasing amps myself (always use a tech).

If I swap out the pre amp tube (Electro-Harmonix 12AX7 in V1) as you suggested will I need to re-bais? Don't think so but need to know for sure.

What sound difference can I expect with swapping the V1 tube?

Note that I am playing this amp at low volumes with the master at 1-2, so it seems like pre amp tube improvements would make sense for my use.

Thanks,
Doug
__________________
Amps:
Marshall 1981 JMP MK2 Master Lead 50W Combo
Marshall 1987X Plexi 50W Head w/Pat Sullivan Mod
Marshall Class 5 MKII Combo
Fender 1965 Vibrolux Reverb-Amp
Fender 1972 Twin Reverb (BF Modded)
Fender 1974 Deluxe Reverb
Fender 1977 SF Vibro Champ
Cabs:
Marshall 425B Cabinet with Greenbacks
Marshall JCM 800 Lead 1936 Cabinet with G12-65's
Guitars:
96 Gibson Les Paul Standard
99 Fender A.S. Telecaster
11 Fender A.S. Telecaster (Ash)
08 Fender A.S. Stratocaster
jcm800gridlock is offline   Reply With Quote
Unread 12-28-2012, 01:15 PM   #29 (permalink)
Senior Member
 
eastwood6's Avatar
 
Join Date: May 2011
Posts: 264
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by jcm800gridlock View Post
East,

I've owned tube amps for over thirty years but have not really played with swapping tubes or biasing amps myself (always use a tech).

If I swap out the pre amp tube (Electro-Harmonix 12AX7 in V1) as you suggested will I need to re-bais? Don't think so but need to know for sure.

What sound difference can I expect with swapping the V1 tube?

Note that I am playing this amp at low volumes with the master at 1-2, so it seems like pre amp tube improvements would make sense for my use.

Thanks,
Doug
You only need to bias an amp when changing the power tubes. You can swap out the pre-amp tubes (12AX7/ECC83 types, the smaller ones under the shields) without having to do anything else to the amp.

At low volume you likely won't hear a dramatic difference between pre-amp tubes. The JMP 2104 starts to open up when the master volume is at about 4 or above, and its then that you can really get a sense of both what the amp is capable of, and what the different pre-amp tubes sound like. It's also crazy loud at that volume... !

Swapping tubes can alter the amount of gain or level of distortion the amp delivers. Can also change the amount of high or low end tone as well as the overall feel of the amp. Most of the new production pre-amp tubes I've tried have a lot of gain and sound modern and brittle in tone to me. The EH 12AX7 seemed to have less gain and a fuller, more musical tone, and made the amp sound more like what I remember hearing in 70's style rock - old school tone, if you will.

If you are happy with what you have, by all means stick with it, but sometimes you can be surprised with what you find when trying some different tubes, new or old. There are a number of threads on the forum that discuss the pros and cons of different tubes.
__________________
Marshall 3203 Artist 30 head
Marshall 1965 A & B 4 x 10" cabs
Marshall C5H Class5 head
Fender '65 Deluxe Reverb Reissue
1977 Gibson Les Paul Deluxe
1996 Fender American Standard Stratocaster
eastwood6 is offline   Reply With Quote
Unread 12-28-2012, 04:08 PM   #30 (permalink)
Senior Member
 
Voodoo Amps's Avatar
 
Join Date: Dec 2009
Posts: 207
Re: 1981 JMP Combo, More Pictures

Quote:
Originally Posted by jcm800gridlock View Post
Bought this amp last Sunday and posted a few pictures from my I-phone in another thread, thought that I would add some better pictures from my camera.

Still hard to believe that this amp is 31+ years old.
Congrats! I have one of these at the shop but it has the black & white check grillcloth. Enjoy!!


Happy holidays;
Trace
Voodoo Amps is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 07:56 AM.


Find us on Facebook!   Follow us on Twitter!

Our Network: PRS Guitar Forum | Luthier Forum | SG Guitar Forum | Les Paul Forum | Music Gear Forum | 7 String Guitar Forum | Acoustic Guitar Forum

MarshallForum proudly supports St. Jude Children's Research Hospital

Copyright © 2005-2014, MarshallForum.com. All Rights Reserved.