How to Fix Marshall JCM2000 DSL50 No Heaters V1 and V2

[@BimMorrison]

Everyone makes mistakes because of imperfection; it's the ones whom catch their mistakes and make correction do good work.

[@stuartukguitarampguy5830]

Well said. Cheers Bim!

[@BimMorrison]

Thanx. If I didn't live across the Atlantic, I would be Bringing my jcm 2000 50w to you for repair. Cheers from Alabama.

[@jeffjohansen3458]

I want to thank you for making this video! I didn't have the exact issue that you went over here but through watching this, I was able to figure out what was going on with my own amp and I once again have an amp that I really enjoy playing.

[@stuartukguitarampguy5830]

Thanks Jeff that's execatly why I make the vids!

[@peterday7077]

Good repair Stuart. The Marshall DSL50 and TSL60 are my favorite amps. They're easy to bias. And I love their high gain distortion. But they're made very complicated.

[@stuartukguitarampguy5830]

Thanks Peter.

[@ferraridinoman]

Nice one Young Stuart!! We all make mistakes! (With me being the exception of course!!) ha ha!

[@tjsogmc]

I am certainly glad that I've never left off a connector inside an electrical device before buttoning everything up... never in 35 years have I done that.... and certainly not with a traffic light control panel at the very top of a drawbridge....

[@stuartukguitarampguy5830]

Suspiciously specific.... !!!

[@fredflintstone2077]

You made hard work of that :-). When you were working on V2 later in the video I was telling you that it was V3 earlier in the video you said was the problem but you didn't listen.

[@stuartukguitarampguy5830]

That's odd because I DID har a faint voice saying V3....V3.... but put it down to wind noise outside. Can you speak a bit louder next time? Tx

[@LPCustom3]

I love the Orange Valve Tester! I got one when they came out Great bit of kit!

[@stuartukguitarampguy5830]

Yes very useful I think the tests are probably a bit go - nogo, but still useful. So useful that they immediately stopped making it!

[@electrolytics]

Hey Berkshire Amp Repair. Keeping Rock and Roll alive one diode at a time. Thanks for the cool videos.

[@stuartukguitarampguy5830]

Ha ha! Just repaired a nice Salisbury duo fuzz pedal. Worth a frtune these days!

[@leewright5616]

I had one of these amps for several years. it was built in 2002, thankfully never had the issue with the conducive board. I did hear say that the 100 watt models were more prone to it. Not sure if there's any truth in that. You're right brilliant amps and i really regret selling mine. much preferred its sound over the JVM I currently own.

[@stuartukguitarampguy5830]

You could buy another? There are plenty around.

[@leewright5616]

@@stuartukguitarampguy5830 well yes that is true. There are also some other Marshall’s I’d like to try such as a plexi and a silver jubilee. But you’re right they keep popping up for sale. Mine went off to someone in Belgium! I think I got lucky and had a good one, that’s the only reason I haven’t pursued getting another one, because of the possibility of getting one with issues. The studio series intrigue me too. Would be interested to hear one of those in the flesh. I had a couple of the vintage modern combos too. They’re a great sounding amp!

[@ScottyBrockway]

PS Vane factory in china is in full production, Sovtek has bypassed sanctions but demand is high. JJ is back in stock most places now.

[@stuartukguitarampguy5830]

Hi Scott. That's VERY interesting news. What is the Vane factory? Is that the same one that had the fire?

[@shredx81]

Great stuff again Stuart! Thanks for the upload and thanks so much for helping me out with my Friedman! I owe you one!

[@stuartukguitarampguy5830]

I'm glad you are enjoying the vids!

[@jerrylondon2388]

Stuart, I notice some builders place links in the "Subscriptions" section of their KZbin channel to those builders/artists they respect. I use this as a way to connect with other higher caliber content providers. If you, Lyle, Brad, Chris, the other Brad, or Uncle Doug feel someone is worth your time, maybe it's worth my time and attention as well. Thanks, Jerry in Vegas

[@stuartukguitarampguy5830]

Thanks Jerry I didn;t know about that. I will investigate.

[@rgbplumbinghilton]

great simple fix 👍 another one of the common faults on the DSL range 🙂

[@stuartukguitarampguy5830]

Hi Richard. Thanks. Yes they certainly had a handful of problems there.

[@jothanankrogh]

I don't work on marshalls often, but recently working on a DSL combo, all of those marshall ecc83s with the silvery innards were very noisy. Just changing them turned an unusably noisy amp to sounding... less noisy.

[@stuartukguitarampguy5830]

Ok useful info thanks Jonathan

[@lousekoya1803]

Leve your work Sir ! Be careful with that Orange tester , two friends of mine had one and they often tested worn on NOS Mullatd 12AX7 's and others. If you Google Orange Valve Tester issue , you'll be surprised on how many sites there is talking about those being falty.

[@stuartukguitarampguy5830]

Hi Lou, yes I know about that tester, not at all reliable. Orange withdrew it about 5 years ago, which is interesting. They promised a new tester but it just hasn;t emerged. It's not a trivial problem making a valve tester.

[@lousekoya1803]

@@stuartukguitarampguy5830 Oh I see , I didn't know they pulled it out. Have a good say and see you on the next one !

[@fredflintstone2077]

It is strange how we work differently. If have to go to a lot of trouble to remove a board (as you did) I never refit without checking it over for bad/dry joints' Also, I never full reassemble until I have tested it is working. Had you just fitted two plastic nuts to the rear pcb it would have been a quick job to plug in the forgotten bias connector.

[@stuartukguitarampguy5830]

Hi Yes I guess we all work differently. Btw just because I dont show something (e.g. checking for dry joints) doesn;t mean I didn't do it. Although in this case I can;t recall if I did or not. All the best

[@TheBrothaAB]

"Real world amp repair," ain't that the truth! Thanks for the video!

[@stuartukguitarampguy5830]

Glad you enjoyed it!

[@montygore]

Hi Stuart,me again. I enjoyed the video. Any tech in what ever field mistakes happen. I have a question about a Marshall DSL40CR if you have worked on these. I am thinking about buying one but wonder if the preamp valves are soldered to the board or are they in sockets. Thanks for all the wonderful videos. You are a genious. Going to bed now. Greetings from Texas USA.

[@stuartukguitarampguy5830]

Hi Monty. I've never heard of valves being soldered into a board? They'll certainly be in sockets on the DSL40. All the best.

[@goodun2974]

One notable exception to the general longevity of most preamp-type tubes,,12AX7 and their cousins,, is that Russian preamp tubes have a disproportionate tendency to fail prematurely in cathode-follower circuits. Phase invertors in particular often use cathode followers, and so you might be better off with a Chinese or Yugoslavian tube there, or vintage NOS. It would have been interesting to know if the one tube that tested weak and had a discrepancy in gain between the two triode sections was the one being used for the phase inverter.

[@stuartukguitarampguy5830]

Ok interesting info thanks.

[@thehoppo]

I wish future me would send past me reminders, and maybe even lotto numbers!

[@stuartukguitarampguy5830]

Yes I could think of a few I'd send myself!!

[@jernejkurincic9050]

I was looking now at the top of the chassis, and it looks like that there is a "cover", which holds the main PCB - if the tops screws were removed, maybe it would be possible to remove the mainboard without dealing with other PCBs ...

[@eelbowski]

Turns out this is possible. I had the same issue with my JCM2000, v1&2 were cold (occasionally). I removed the "cover" and undid a few screws holding the PCB and resoldered the rectifier contacts, this manouver seems to have done the trick.

[@robertbaranski633]

You are genius mate,not a idiot!!!👍

[@stuartukguitarampguy5830]

Cheers Robert!

[@LothyBluesCave]

Just wondering if it is possible to remove that pan to get to the solder side of the board?

[@gingercat777]

All Marshalls are a PITA to work on.

[@JPDESS]

Marshalls are easy, mesa boogies are something, and yes it with some ingenuity.

[@gingercat777]

@@JPDESS Try fixing a Marshall with a conductive board.....and no replacements.

[@jonsick445]

@@gingercat777 Marshall still manufactures replacements.

[@gingercat777]

@@jonsick445 For some late models yeah.

[@robbieandkimberly]

Hi Stuart, did Marshall actually correct this bias problem in 2004/2005 or is that just a internet rumor? (I also heard if the back cover is black, the boards are good)

[@stuartukguitarampguy5830]

Hi Robbie Yes they did, it only affects earlier boards with low version numbers. The way I heard the story was that they were suppled with PCBs which were very slightly conductive, hence the issue. They switched suppliers (or the suppliers corrected it) and it's been ok since, which, of course,was quite a few years ago now.

[@robbieandkimberly]

@@stuartukguitarampguy5830 thank you so much Stuart, that's awesome 👍

[@jamesprice6381]

I desolder it, use a xacto knife n scape the lead, reflux n solder ymmv................Ive had these amps go CONDUCTIVE between Hi Tension n bias, used hollow drills n drilled pin 5 n hardwired it. saved the amp, also some of the have a 500pf ( 47pf maybe) pin 3 to 5 on LAST power tube ( WHY ON EARTH, il never know lol) ( OUCH) it will LEAK n cause probs to i chucked it w/no adverse effects ( One side going hotter in current)

[@stuartukguitarampguy5830]

Hi James YEs a well kown problem with the earlier boards. I've changed/fixed many.

[@WildRiceProductions1]

Nice one Stuart - helped me fix the exact same problem on one of my customers amps - And yes…love to see all the natural mistakes, helps me avoid doing them🤘😅

[@stuartukguitarampguy5830]

Thanks! That'll cost you 3kG of wild rice please....

[@WildRiceProductions1]

@@stuartukguitarampguy5830 🤘🤣

[@jesseyasaitis9036]

Do you get any low-level hum through your speaker when working on this amp?

[@stuartukguitarampguy5830]

Hi Jesse. Not that I recall. Why are you asking?

[@jesseyasaitis9036]

@@stuartukguitarampguy5830 I have one on the bench. I replaced the main board, PT, and OT. The level of hum is quite low and does not increase as you increase volume.

[@stuartukguitarampguy5830]

@@jesseyasaitis9036 Hi Jesse. Again I'm not really sure what you are asking me. Sorry!

[@danielsaturnino5715]

What a pain, boards in and out over and over :)

[@stuartukguitarampguy5830]

It goes with the job!

[@wizardx4187]

ya blew it