madbeanpedals::forum

General => Open Discussion => Topic started by: pedalman on December 17, 2013, 07:29:18 AM

Title: Marshall JCM 2000
Post by: pedalman on December 17, 2013, 07:29:18 AM
Went in to a pawn shop today to test drive a Pro Jr. All of a sudden a Marshall JCM 2000 DSL 401 comes out on the sales floor. I thought no way is this thing in my price range. Started talking to the guy and he said it had a couple of bad tubes in it. Said I could have it for $200 After a little talking and haggling I walked out with it for $125 ! Tube shopping time  : )
Title: Re: Marshall JCM 2000
Post by: DutchMF on December 17, 2013, 12:01:54 PM
Deal of the century!!! Enjoy  :D

Paul
Title: Re: Marshall JCM 2000
Post by: rullywowr on December 17, 2013, 06:20:38 PM
Awesome find!  Rock it out.
Title: Re: Marshall JCM 2000
Post by: culturejam on December 17, 2013, 06:22:32 PM
Man, what a deal!
Title: Re: Marshall JCM 2000
Post by: pickdropper on December 17, 2013, 06:26:31 PM
Yeah, those are nice amps.  Great score.
Title: Re: Marshall JCM 2000
Post by: gordo on December 17, 2013, 11:22:31 PM
I've replaced bridge rectifiers on those amps from time to time.  The combos tend to run pretty hot.  I came up with an easy fix if you're interested.  Will see if I can dig up my notes and a few photos.  Great amps!
Title: Re: Marshall JCM 2000
Post by: slimtriggers on December 18, 2013, 12:25:59 AM
Why can't I ever find deals like this?!  Nice score!
Title: Re: Marshall JCM 2000
Post by: jubal81 on December 18, 2013, 12:27:38 AM
Quote from: slimtriggers on December 18, 2013, 12:25:59 AM
Why can't I ever find deals like this?!  Nice score!

This. Exactly This. Big Grats, bud!
Title: Re: Marshall JCM 2000
Post by: sirbergersworth on December 18, 2013, 01:29:29 AM
Jerk. lol


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Title: Re: Marshall JCM 2000
Post by: atreidesheir on December 18, 2013, 02:48:40 AM
Merry Xmas.

Everybody gets one.
(http://images4.wikia.nocookie.net/__cb20080702102142/familyguy/images/0/09/Vlcsnap-38668.png)
Title: Re: Marshall JCM 2000
Post by: pedalman on December 18, 2013, 07:04:34 AM
Quote from: gordo on December 17, 2013, 11:22:31 PM
I've replaced bridge rectifiers on those amps from time to time.  The combos tend to run pretty hot.  I came up with an easy fix if you're interested.  Will see if I can dig up my notes and a few photos.  Great amps!

I was told to bias the tubes a tad lower than specs and place a small fan in the back
Any info you have would be cool
Title: Re: Marshall JCM 2000
Post by: gordo on December 23, 2013, 04:42:53 PM
Finally found the photos... This is a DSL 201 but same issue. The culprit is the fact that in the combos the tubes pour heat back up thru the circuit board. Since the bridge rectifier runs a little warm anyway it exaggerates the problem. This photo shows the original rectifier. www.gordomusic.com/Madbean/DSL01.JPG (http://www.gordomusic.com/Madbean/DSL01.JPG)

This next photo shows the replaced rectifier with a heat sink glued on.  I picked this up at MCM and normally it would have to be tied down but the adhesive backing is good and since its not hanging upside down it hasn't been an issue.  Also note that the rectifier is slightly elevated above the board to get a bit of air around it. You can't quite see it in the photo but the board under the rectifier is dark brown.www.gordomusic.com/Madbean/DSL02.JPG (http://www.gordomusic.com/Madbean/DSL02.JPG)

This shows the muffin fan (also from MCM) bolted to the back plate.  It runs on line voltage and I had intended to put it on a switch but its a really well made ball bearing affair and runs so quiet (and at a relatively low speed) that it was unnecessary.www.gordomusic.com/Madbean/DSL03.JPG (http://www.gordomusic.com/Madbean/DSL03.JPG)

Back panel replaced.  The idea here was not to get a whole lot of air on the tubes (this amp sees both live and studio use), but just get ANY air moving to keep it from going straight up.  The mod was done in 2011 and it's been rode hard and put away wet for about 18 months now.  Customer was thrilled.www.gordomusic.com/Madbean/DSL04.JPG (http://www.gordomusic.com/Madbean/DSL04.JPG)
Title: Re: Marshall JCM 2000
Post by: gordo on December 23, 2013, 04:45:30 PM
Oops, those should have showed photos rather than links.  Links work though... :D
Title: Re: Marshall JCM 2000
Post by: junkemail86 on December 24, 2013, 01:07:00 AM
Dsl401 is my main amp.  It needed the rectifier fix, but it's been running and sounding great since.  IIRC, the post 2003 models fixed the overheating issue.
Title: Re: Marshall JCM 2000
Post by: gtr2 on December 24, 2013, 03:28:18 AM
Pics or it didn't happen ;) haha

Josh
Title: Re: Marshall JCM 2000
Post by: pedalman on December 24, 2013, 10:00:32 PM
Finally got a pic up. Hmmmmmm, maybe some of that blue rattlesnake Tolex
Title: Re: Marshall JCM 2000
Post by: rullywowr on December 24, 2013, 10:03:44 PM
Nice and clean!  Perfect travel size too.
Title: Re: Marshall JCM 2000
Post by: stevie1556 on December 25, 2013, 12:13:03 AM
Nice amp! :)

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Title: Re: Marshall JCM 2000
Post by: GrindCustoms on December 25, 2013, 12:36:12 AM
The word «deal» rarely gets such a strong meaning.

Congrats!