JCM2000 good deal?

Clockworkmike said:
That issue has been a real thorn in Marshall's side for a while now, probably their most infamous design flaw to date. Its very fixable and easy to do, but honestly, Marshall should have issued a voluntary recall on it since it became such a wide spreading issue. Instead, they released a $250 replacement board and said " F$ck you guys, here!".

That being said though, its a tough as nails amp, amazingly versatile and in my case, unbelievably reliable ( some never had an issue, guess i got lucky lol) Its design continues to this day with amps like your DSL40Cs, which are the same exact circuitry and sound.
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The funny thing is that when a Marshall has a major defect they basically pretend that the problem doesn't exist.
They basically tell us they never heard of the problems.

Now, there is a microprocessor defect in the new DSLs.
There is an issue with glue used on the new circuit board that was found to be shorting out the circuit tracks.
But they are as usual refusing to acknowledge.
There are several problems with DSL 40 C, DSL40CR.
People had to return them 2-3 times before the problem was recognized.

People still having issues with the defect microprocessor chip, and Marshall still pretends they never heard of the problem....
seems like the amp forums know more about the defects than the factory does....

When Jim Marshall was alive, these problems were handled differently.
Now it's a corporate cover-up.

I was the first person to create a standard test for DSL circuit boards.
That test is now used world-wide.
Before that test, it was all guessing and random parts replacement.

Now you can check to see if a board is good or bad without guessing.
 
Amp Mad Scientist said:
The funny thing is that when a Marshall has a major defect they basically pretend that the problem doesn't exist.
They basically tell us they never heard of the problems.

Now, there is a microprocessor defect in the new DSLs.
There is an issue with glue used on the new circuit board that was found to be shorting out the circuit tracks.
But they are as usual refusing to acknowledge.
There are several problems with DSL 40 C, DSL40CR.
People had to return them 2-3 times before the problem was recognized.

People still having issues with the defect microprocessor chip, and Marshall still pretends they never heard of the problem....
seems like the amp forums know more about the defects than the factory does....

When Jim Marshall was alive, these problems were handled differently.
Now it's a corporate cover-up.

I was the first person to create a standard test for DSL circuit boards.
That test is now used world-wide.
Before that test, it was all guessing and random parts replacement.
Click to expand...
Thats absolutely incredible you nailed that first! I know you obviously know your poop about the amps: you helped me fix my 900 SLX over in the other forum almost a year ago when some other people just spitballed ideas, you nailed it right off the bat!

But i didnt know Marshall was still going thru with the DSL problems in the newer ones too. That really pisses on the legacy of Jim Marshall to keep spitting out a problem over and over without being honest to the buyer and user.

What is the problem with that specific amp honestly? I mean i know it gets its grief, namely BECAUSE of the design flaws and not the tone quality, but what is it about that specific amp's circuitry that is so maligned for problems? Was it just cheap components or the lay out, in your opinion?
 
I have always been a person who looks after my gear or whatever I own. My guitars get lots of use I play at least 2 hours or more every day. And yet if you look at my guitars or equipment they look new, this is just my personal preference. You might say I am a Classic car collector of guitar gear. Anyone here who owns a collector car would probably agree with me, they want it in great shape without scratches without dents or scrapes . And just because it looks good , doesn't mean its not getting used, I am proof of that with my gear. My philosophy has always been , you look after it, it will look after you.
 
chilipeppermaniac said:
Mike, I lost a great but worn tolex Basket weave Greenback 100 watt cab for around $700 and never should have sold it.
BUT house payments are house payments, unfortunately.

Now I roll through a 1960A 300 watt cab
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I got a buddy ( same guy with the poor dead JCM2000 DSL100 thats lying in waste because he wont fix it) who had bought that amp with a Basket weave 100w Greenback cab like your talking. It had a bad speaker ( honestly believe it was just a bad connection) and instead of fixing it, he traded it plus paid $50 for a used 1960B 300w cab. Fine cabinet but he really lost on that deal in my opinion.

I personally love the 1960A/B Cabs, great versatile sound!
 
Amp Mad Scientist said:
The funny thing is that when a Marshall has a major defect they basically pretend that the problem doesn't exist.
They basically tell us they never heard of the problems.

Now, there is a microprocessor defect in the new DSLs.
There is an issue with glue used on the new circuit board that was found to be shorting out the circuit tracks.
But they are as usual refusing to acknowledge.
There are several problems with DSL 40 C, DSL40CR.
People had to return them 2-3 times before the problem was recognized.

People still having issues with the defect microprocessor chip, and Marshall still pretends they never heard of the problem....
seems like the amp forums know more about the defects than the factory does....

When Jim Marshall was alive, these problems were handled differently.
Now it's a corporate cover-up.

I was the first person to create a standard test for DSL circuit boards.
That test is now used world-wide.
Before that test, it was all guessing and random parts replacement.

Now you can check to see if a board is good or bad without guessing.
Click to expand...


This is good knowledge to know, and for buyers to be aware of when purchasing Marshall Amps. Your experience in this field can benefit many of us here on TTR.
 
Clockworkmike said:
I got a buddy ( same guy with the poor dead JCM2000 DSL100 thats lying in waste because he wont fix it) who had bought that amp with a Basket weave 100w Greenback cab like your talking. It had a bad speaker ( honestly believe it was just a bad connection) and instead of fixing it, he traded it plus paid $50 for a used 1960B 300w cab. Fine cabinet but he really lost on that deal in my opinion.

I personally love the 1960A/B Cabs, great versatile sound!
Click to expand...
The G 12 75 cabs? Mike
 
Clockworkmike said:
y
Its sad but true unfortunately. They built a reputation as one if not THE most legendary amp designers in the world and due to loss of their founder, quality control tumbles sporadically. A tale as old as time sadly
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Well we have seen this with big company's who have rested on their laurels and we know what happens , you lose customers and they don't come back .
 
Session 5 said:
No disrespect Mitch, but I personally buy with my eyes and ears. I am sure the amp sounds very good. I am not saying the amp is not a good deal, its just not good enough for me. I am one of those guys who looks after his equipment, when I purchase gear I want it to be pleasing to my eyes and my ears. :cheers:
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No harm no foul Norm
I was just expressing my opinion, I had purchased a white MG cab once from GC online, that turned out to be no tolex and painted white with a roller lol, it had chipped plastic corners, and the top cups for setting the head were missing, they GC emailed me the misled description, but I had already done the deal with my gear card .. $ 90.00 and yes I still have it sounds just like the others.
Cheers
 
Clockworkmike said:
Ive heard you mention having to rebuild literally brand new Mesas. That is ridiculous
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I think the point is:
with PC boards, there is always a certain amount of screw ups....no matter who makes them.
It might be soldering, it might be insulation failure........

The hand wired amps were more reliable but,
the old amps didn't have the space for channel switching or any of the fancy gimmicks.

So to remain competitive manufacturers were basically forced to abandon hand wired and use mass produced PC boards.
 
Amp Mad Scientist said:
I think the point is:
with PC boards, there is always a certain amount of screw ups....no matter who makes them.
It might be soldering, it might be insulation failure........

The hand wired amps were more reliable but,
the old amps didn't have the space for channel switching or any of the fancy gimmicks.

So to remain competitive manufacturers were basically forced to abandon hand wired and use mass produced PC boards.
Click to expand...

This is how I see it too. In the 4 Valve heads I have, the things I have learned started on P2P hand wired amps, and progressed to PCB ones as I acquired ones that were manufactured that way. This brings my need to refine my skills of de-soldering, re-soldering, cleaning etc all up a notch to deal with managing heat to not mess up PCB traces while swapping components, wires. Then on top of that, are the issues Amp Mad addressed in the DSL or other PCB designed amps that have inherent or potential flaws which can operate reliably, fail easily, or deteriorate and possibly cause collateral damage. Then as he mentions, there are parameters and issues that we can test for to see the overall health of the amp plus breakdowns of various known problematic components or not.

Does this sum it up pretty well, Amp Mad?
 
chilipeppermaniac said:
This is how I see it too. In the 4 Valve heads I have, the things I have learned started on P2P hand wired amps, and progressed to PCB ones as I acquired ones that were manufactured that way. This brings my need to refine my skills of de-soldering, re-soldering, cleaning etc all up a notch to deal with managing heat to not mess up PCB traces while swapping components, wires. Then on top of that, are the issues Amp Mad addressed in the DSL or other PCB designed amps that have inherent or potential flaws which can operate reliably, fail easily, or deteriorate and possibly cause collateral damage. Then as he mentions, there are parameters and issues that we can test for to see the overall health of the amp plus breakdowns of various known problematic components or not.

Does this sum it up pretty well, Amp Mad?
Click to expand...
Like anything, more circuitry like ICs, Diodes, transistors etc is going to equal more problems and is harder to fix. Look at TVs 25 years ago to TVs today: there were thousands of repair men available because they were still simple enough to repair. But as TVs progressed to more advanced, thinner models with millions of new components, notice the repairmen are gone? The reason why is sad but simple: its cheaper now to replace the entire item than to repair it.

Same goes for circuit boards in amps most of the time: Marshall issues the Revision 20 board for the JCM2000 because they couldnt sit down and pin point the problem. They figured it was cheaper to just change it all. Thats not proven to be true however, its cheaper to fix it but thats the thought of their's
 
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