I have the JTM 1H offset. The tone control has no effect on the sound. I tried different volume levels. I tried different cabinets. I also changed the tubes. any advice?

Hi, i have just aquired a haze 15 head in great nick.

please anybody could you advise on what marshal power tubes are used as in maker ?

Also they use three ecc83 the first being a different code ( this is the one with the aluminium cover) is this the higher gain one? if so could i swap for a lower gain with no problems.

Also has anyone upgraded the speaker that is fitted ( marque) ? if so to what just interested

Thanks John

I have had my DSL40 for about 5 years now.  Today I turned it on and have zero gain.  The volume seems to work but no distortion, even on ultra gain.  I am assuming this means the tubes need to be replaced, but the poerp or preamp tubes?  Or all of them?

Hey, 

So this is my first personal all valve amp. Ive had a few around but never one of my own, i know how to use them and what not to do, but ive never owned/played one long enough day to day to realise if the tubes are not properly working. 

The other day, i turned on my amp (It's a 110 volt made for USA mini jubilee head that i run through a transformer at 230 volts mains) as usual, and after i let it be on standby for about 10 minutes, when i turned it on, there was no sound. I proceeded to turn it back on standby and check all my cables in my signal chain on my board, and turned it on again (this happened a few times, maybe 4 or 5) and still no sound. 

I then checked the back because i do connect some pedals in the effects loop, and to my shock the speaker cable wasnt connected! (someone must have moved it around while cleaning and i never noticed as its on the back flush to a wall) 

I immediately turned the amp off. and then connected the speaker cable of my cab to the right speaker out, and after a few minutes, started up the amp, after giving it a good 10 minutes on standby. It worked! and the EQ was reacting normally, everything seemed fine. I had friends over so didnt really sit down and check in depth or notice anything off tone wise. Plus it was running on fairly low volume since it was late. 

It's been about 3 days, and i played yesterday, didnt notice anything odd. But today, i feel the overall volume the amp is giving out is really low compared to before. and i know this amps clean isnt really super clean with humbuckers but im feeling like its breaking up way too much and quickly as you turn up.  Could it be that i busted a power tube or pre amp tube? The amp is a year old and played fairly reglarly and gigged only 10 or so times. 

Any help, advice on the matter will be appreciated! Thank you in advance! 

Hello...I purchased my JCM 800 (serial#02726N) back in the Fall of 1981. I pulled the rear plate off the head for the first time so I could install new tubes for the first time. I expected to find four EL84's, but was totally surprised to find 2 KT66's, and 2 6L6GC's instead. Is this normal? The amp sounded totally different from other Marshalls I was exposed to, now I know why. Did Marshall do this often, or did they just run out of specific tubes and slap in whatever they had on hand. It's kinda hard to believe they did that as the KT66's require an entirely different transformer than the EL34's. Any comments or logical explainations?? Thanks.

I recently got myself a Marshall Valvestate 8100 head, which sounds amazing for a hybrid amplifier. Now there is one problem with the amp, and that is that there is a low buzzing sound when I turn it on. It does not get louder when I turn up the volume or gain, and it doesn't disappear when I switch channels, which means that it can't be the pre amp tube that causes the problem. I don't use a grounded power socket, but my other amp (an Orange Tiny Terror) doesn't hum so I don't think there is a problem power wise. My guess is a bad soldering joint somewhere in the amp, but I have no idea where to start looking. Is there someone who can tell me how to get rid of the buzzing? And how do I identify a bad soldering joint?

Cheers, 
Brian

New amp, out of the box the classic gain channel is very quiet. Even with it turned all the way up you can talk over it.

Probably about as loud as the red channel with volume at 1.5 or 2.  All the tubes are lit up, the red channel everything

works correctly. Any ideas what to look at, I bought the amp online and dont want to return it and wait another week for

a replacement if it is something simple that I can fix on my own.  (I dont have any replacement tubes on hand to try swapping out)

Hi,

to whom it may concern.

I would like to ask a help with the preamp layout in JVM 410 (2007). I have found this online but it says "Assumed". As you know the tubes on board starts with with V1 a power tube to V4 so it is hard for me to assume.

Could you please confirm if this diagram is correct (bottom right of the picture)?

thanks in advance,
marcel

All,

I have seen this a lot but just wanted your feedback.

The great amps that I have played through, such as Mesa Boogie, Carvin, Catagory 5, etc, are awesome

but they never seem to have enough gain or sustain.

Is it cool to use an ODC Fulltone or a Tube Screamer in front of a Dirty Rhythm, or Lead channel?

If so, what kind of set up's do you use?

TIA,

Jerome

I'm wondering what year this DSL 15 h is I'm about to purchase V01002A30U. Thanks for any help, I'm so excited to own my first all tube Marshall weather it this one or a brand new one

Hello!  I have a Marshall DSL40c, which I absolutely love.  I swapped the speaker out for a Celestion Vintage 30 (16 ohm) a little over a year ago, and it sounds great.  However, I recently got a lower wattage tube amp (Vox AC4TV) and have been running it through the DSL40c (basically using the DSL as a speaker cab, with the power chord disconnected). 

So here's the problem:  After 2 days of using this configuration, the DSL has started making a sound when I play the vox through its speaker.  The best way I can describe the sound is that it is like a tabmourine, like those little metal disks jingling together.  It does this on certain notes, like the open low E string, or a C chord, but not on other notes like a B chord (i.e. 1 fret away).

When I run the the Vox alone through its internal speaker - no issues at all.  When I run the DSL amp section alone through it's vintage 30, no tambourine sounds, although it seems that the green clean channel is lower volume than it used to be (the other 3 channels seem to me the same volume as normal).  There is also some instability in the volume (goes in and out, but in a sublte way).  There is some clicking and popping when I first fire it up, but this stops after it has been on for a while so not sure if this is normal or not.

I have been looking up reasons why amps may rattle, but everything I am finding describes issues with the tubes that are being played through - my issue seems to be a bit different, since the rattling (tambourine jingle) sound I am hearing seems to be coming from the Marshall when I am not using its tubes (playing through the Vox as a head).

Is it possible that a tube has gone bad in the Marshall, and when I play the Vox through the Marshall's speaker, the vibration is rattling the broken tube and making this tambourine sound?  Would a reduction in the volume of the green clean channel imply it is a preamp tube vs power amp tube (since the other channels are unaffected?)

Thanks for any help you can offer.  I don't mind taking it in to a tech, but I have read a lot of posts of people who took their amps to techs and had tubes changed, etc. and the problem persisted.  I want to have a pretty good idea of the problem before I start investing in having it fixed.

Thanks!

There is a loud popping noise when I am switching from ultra gain to classic gain channel while still holding or playing, but does not occur when going from classic to ultra. Also my loop pedal's volume is significantly lowered when on the ultra gain channel. Could this be a tube or footswitch issue? Is it easily fixable or do I need to take it in so someone can take a look at it? This was also just purchased on February 3rd 2018. Any help is much appreciated because I absolutley love this amp. 

Hey all, 

Who has been working on the schematic for the new DSL 1w (2018)?

I've got mine open and have started thinking about some tone mods but would love any help with the schematic, part schematic or even a mod list.

I'd be totally happy to hack mine up first if anyone has a mod idea too.

I can read a schematic but I'd completly f%^$ it up if I tried to wrtie it out just via the PCB so if you'd like to help let me know and I'll send the high res pics ( assuming you dont have a 1w yourself).

Also I'd be all ears for some tube advice. I've put a 5751 inplace of one of the 12AX7 and its a bit better to my ears. I'm going to say V2 is the dirt channels V yeah?

So far I love it and i'll be interested to see what Blackstar do next with their future 1w.

S.

Hi,

Have just replaced my DSL5c with new version and  i see valve layout has changed. Can i replace the ecc99 with a TAD12bh7a which I still have? Apparently depending on circuit or amp design this can be possible.

Also why the reduction to 2 ecc83's? Your site and Sweetwater both list this new model as having 3 ecc83's! Is my new amp wrong? Is the phase inverter missing?

Thanks

Mike

HI all, 

There is a DSL15 head with MX412 for sale at a good price about an hour away from where I live and I wanted to ask a couple questions before I decide if I wanna go check it out or not. 

Is a 4x12 too much cab for the DSL15? I mean, will it have the same punch? I don't play in a big space so that's why I love the 15/7 switchable watts on the head. Would I be better off with a 2x12 or even a 1x12? I have a Blackheart Handsome Devil combo that has 15/7 watt option and it's great but I want a half stack configuration and, well I just really want a Marshall! 

My second question is about the tubes. I notice the head uses 6V6 power tubes unlike the big guys with EL34s. Is there a big difference? I have a Fender that uses 6V6s and it's great, but I want that Marshall roar. Can the DSL15 get me to close to a good Led Zep classic rock type sound or should I go for something else?

Cheers!

My DSL started to misbehave after about six months since I bought it. When I turn it on, the tubes don't light up so the amp itself does not produce a single sound. Now, I have tried to send it back to the store where I bought the amp but the damn thing magically started to work there in fornt of the repairer so he said that he could not find what's wrong with it. The problem occured a few more times so I contacted one of the local electricians and he did the job and the amp finally worked. After approximately two months the same problem occured so I asked the same guy who fixed it earlier to fix it again, and again it worked. Now after a month or so, it has happened again. Has anyone experienced a similar problem? I need some advice. Thank you :)

Hello. 

I know everybody's here will say "change the tube for 6L6"

I  have a Code 50, so I turn to a particular preset and it includes say, flanger. how do I turn off the flanger and maybe add chorus instead. I know that the MOD section can be turned off. If it is on are the inactive effects simply zeroed out or is there a way to enable and disable each different effect. thanks. It looks like this applies to PRE EX, DEL and REV as well.

A second question is can I use the headphone out into either the guitar input or effect return of a second amp, either tube or SS?

thanks

I've had a DSL40c for a year or two, and it worked fine until a few months ago.  While playing, the sound cut out and there was a slight burning smell.  I replaced all tubes and pre amps and it worked fine in testing, but then did the same thing when I got it home.  Repair guy thought it was a pre amp issue so changed those out again.  It worked fine in testing, and then did the same thing again when we got it home.  This time when we turned it back on, it would work, but sound would go up and down sporatically with some popping and crackling.  Replaced the tubes again, and it worked fine for an hour.  Then the sound cut out, and we noticed it would not switch channels.  After turning it off and letting it cool down, we turned it on again and it worked fine and channels would change.  I'm not sure what to do at this point.  My weekend routine of dropping the amp off and then getting it back (with high-hopes) has gotten old.  The problems have occurred while plugged straight into the guitar, as well as through a pedal board.  Also, the problems have occurred via multiple power sources in different locations (i.e. not always through the same wall socket).  

Thanks for your help