DSL 100H Gut Shots

New DSL range, DSL 5C, DSL15H, DSL15C, DSL40C, DSL100H

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DSL 100H Gut Shots

Postby Cipher » 08 Jun 2013, 08:52

For your reference:
The following are photos of the new, DSL 100H. The DSL 40C appears to utilize the same PCB.
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Re: DSL 100H Gut Shots

Postby Cipher » 08 Jun 2013, 08:56

DSL 100H continued.....
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Re: DSL 100H Gut Shots

Postby surfnorthwest » 08 Jun 2013, 09:16

Good high resolution pictures. I am sure those will come in handy for guys when needed. Thanks for posting those up.
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Re: DSL 100H Gut Shots

Postby Far Rider » 08 Jun 2013, 09:20

Thanks for the pics. I always wondered what was under my amps skirt :yourock

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Re: DSL 100H Gut Shots

Postby Gonzo » 08 Jun 2013, 12:12

RRRrrr....I'm getting some gas for one of those :( I just bought my JMD too. I would like to have the 40w combo just to kick around in the house. They look like a pretty decent quality build at an affordable price. Nice pics.

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Re: DSL 100H Gut Shots

Postby Duffy » 10 Jun 2013, 00:58

Very usable info. I have a new DSL100H and am contemplating the C19 mod. It seems to only make sense.

Pictures like these are invaluable. These should go in the DSL40C info thread that consolidates a lot of important info all into one thread.

Hopefully someone will copy this over into that awesome thread, if they haven't already. This is the type of info that a lot of us want to see. Factual, useful stuff, Reference materials that we can go back to and use during projects, etc.

I really enjoy my DSL100H and it has been a good amp. I probably should stop hesitating and do the C19 mod.

I have, by the way, a DSL40C coming at some unpredictable date. They are backordered but mine has been in the que for about six weeks. I'm looking forward to it. I got rid of a JMD 102 and decided to get the 40C. I'm sure I will be happy with my choice. The JMD was not dependable and did not stand up to the test of time.

Is there anything I need to do to help ensure that my DSL100H will stand up to the test of time, or am I okay leaving it stock, tubes, etc?
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Re: DSL 100H Gut Shots

Postby Cipher » 10 Jun 2013, 02:48

Hi Duffy, I'm happy to see you find the photos useful.

I have replaced V1 and V2 preamp tubes, and all four power tubes. I used NOS Sylvania's in the preamp and there was a noticeable improvement. When I replaced the power tubes with E34L's, I set the bias on the cold side (78ma per side) and to my ears, this yielded another improvement, albeit not as much as the NOS preamp tubes provided. V1 & V2 were replaced because both of the factory tubes failed. The power tubes were replaced because one of the four was failing so I bought a matched quad and just replaced them all. If you are looking to improve the tone and perform a little preventative maintenance, the glass is good place to start. IMO.

The rest of the amp is all stock, including C19. I thought about clipping it, but keeping the Treb and Pres between 2-4 works for me. If I do anything with C19, it will be a value change, make the cap switchable, or maybe both.

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Re: DSL 100H Gut Shots

Postby matt3310 » 10 Jun 2013, 04:01

I wonder if these need the ground mod on the speaker outputs, or did Marshall fix that on these?

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Re: DSL 100H Gut Shots

Postby Duffy » 10 Jun 2013, 04:10

Cipher wrote:Hi Duffy, I'm happy to see you find the photos useful.

I have replaced V1 and V2 preamp tubes, and all four power tubes. I used NOS Sylvania's in the preamp and there was a noticeable improvement. When I replaced the power tubes with E34L's, I set the bias on the cold side (78ma per side) and to my ears, this yielded another improvement, albeit not as much as the NOS preamp tubes provided. V1 & V2 were replaced because both of the factory tubes failed. The power tubes were replaced because one of the four was failing so I bought a matched quad and just replaced them all. If you are looking to improve the tone and perform a little preventative maintenance, the glass is good place to start. IMO.

The rest of the amp is all stock, including C19. I thought about clipping it, but keeping the Treb and Pres between 2-4 works for me. If I do anything with C19, it will be a value change, make the cap switchable, or maybe both.



I know a dude around here that makes amps and is highly regarded as a guitar and amp man. He isn't formally trained in the field, but obviously has a lot of real world expertise. Do you think I can trust him to put in the new tubes and bias the amp? Those were JJ E34L's, right? I have liked the electro harmonix preamp tubes in the past.
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Re: DSL 100H Gut Shots

Postby Cipher » 11 Jun 2013, 12:34

Duffy wrote:I know a dude around here that makes amps and is highly regarded as a guitar and amp man. He isn't formally trained in the field, but obviously has a lot of real world expertise. Do you think I can trust him to put in the new tubes and bias the amp? Those were JJ E34L's, right? I have liked the electro harmonix preamp tubes in the past.


Yes, they are JJ E34L's. (and I'm not a big fan of JJ's typically, especially on the preamp side) I only went with those because eurotubes is local and they tested all my power tubes, at no charge, and the new set to make sure they were indeed a matched quad. In fact, they told me new tubes were not necessary from an functional standpoint. One of the stock tubes was emitting a faint high pitch noise that was not coming through the speakers (like a microphonic tube would). It bugged me anyway so I bought a new set and have the stock set as a backup.

Is the amp/guitar guy capable of changing and biasing new tubes for you? Based an what you said, he should be more than capable, but I have no way of really knowing for sure. For warranty purposes, I would suggest someone who is certified as a Marshall repair tech.

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Re: DSL 100H Gut Shots

Postby Cipher » 13 Jun 2013, 12:07

matt3310 wrote:I wonder if these need the ground mod on the speaker outputs, or did Marshall fix that on these?


That's good question Matt, and I don't have an answer, unfortunately. How can we tell if this issue has been corrected? I know it still shuts down the two, 8 ohm speaker jacks when the 16 ohm is in use. What I don't know, is if this is prone to fail over time with these new designs. (like some claim the JCM2000 versions could)

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Re: DSL 100H Gut Shots

Postby SublimeDoinTime » 17 Oct 2014, 08:11

New to the forum. I know this is an old post, but I am trying to rebias my DSL100H and was wondering if you could explain how you get from: opening the back of the head, to the actual exposed board?

Now that they moved everything inside the casing I am having a little trouble getting to the trim pots. Any tips would be greatly appreciated! And thanks again for posting these helpful pics.

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Re: DSL 100H Gut Shots

Postby surfnorthwest » 17 Oct 2014, 08:33

The chassis will have to be removed from the head box. There are four screws on the bottom of the head box you must first remove. Then slide the chassis out
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Re: DSL 100H Gut Shots

Postby (JAKE) » 14 Feb 2015, 02:03

So the power tube sockets are chassis mounted. Nice improvement. It still looks like the pre's are board mounted though, which may not be a big deal. And it looks like Marshall has consolidated the circuit to mostly one board, unlike the UK DSL's. Overall, I would say the Vietnamese DSL's look like an improvement to the UK DSL's constructionwise, but I could be wrong since I'm not exactly an electrical engineer :howdy

Although, it would have been nice if they had kept the externally mounted bias probe and adjustment feature found on the UK DSL's.

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Re: DSL 100H Gut Shots

Postby Mullard2203 » 14 Feb 2015, 06:04

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Looks as though Santiago eliminated 50% of the UK DSL guts.

Also not crazy bout the Vietnam trannies, they look like they are each missing about 5 pounds of laminate plate weight.

Dude on MF just had a meltdown, not sure the cause yet.

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