DSL 40CR Weird Lately

[matttornado]

The past few months my dsl 40cr been acting weird. Short history; Purchased new in 2018. About year later, volume started fading out, took to marshall qualified tech under warranty - replaced "mother board" - all good up until the past few months.

So now, it'll randomly change channels from classic red to ultra green for no reason. I keep it in the Classic red channel and use a DS-1. I don't have a foot switch hooked up either.
So now I set the Ultra Green channel to somewhat sound like the classic Red in case this happens.



Does this happen to anyone else? This amp gets played heavily as I been gigging with it 3-4 times a month since I got it. So overall, it's been pretty good to me.....

That's why I like my old 100 watt Superlead - Very reliable, no fancy circuits & can be repaired somewhat easily. Downside - lots of power to keep under control and it needs at least a 2x12 to get the job done for me.

 

[Troy T. Blues]

I also bought mine in 2018 when they were more reasonably priced. Last night, half way through rehearsal was the first time I've ever experienced an issue with it. All of a sudden I lost volume/power. Even turning the knobs higher did not yield much difference. No fading or anything like that, just loss of power and it stayed at a certain lower level. I'm hoping it's just a preamp tube. I did not have time to inspect it last night, but I will tomorrow.

I have not experienced the changing channels issue (yet).

 

[matttornado]

I also bought mine in 2018 when they were more reasonably priced. Last night, half way through rehearsal was the first time I've ever experienced an issue with it. All of a sudden I lost volume/power. Even turning the knobs higher did not yield much difference. No fading or anything like that, just loss of power and it stayed at a certain lower level. I'm hoping it's just a preamp tube. I did not have time to inspect it last night, but I will tomorrow.

I have not experienced the changing channels issue (yet).

Good luck! I hope it's just a tube.

 

[Troy T. Blues]

Good luck! I hope it's just a tube.

Thank you! Me too. I hope it's as simple as that. We shall see.

 

[scozz]

I also bought mine in 2018 when they were more reasonably priced. Last night, half way through rehearsal was the first time I've ever experienced an issue with it. All of a sudden I lost volume/power. Even turning the knobs higher did not yield much difference. No fading or anything like that, just loss of power and it stayed at a certain lower level. I'm hoping it's just a preamp tube. I did not have time to inspect it last night, but I will tomorrow.

I have not experienced the changing channels issue (yet).

Your issue sounds like it might be tube related.

Don’t know about @matttornado problem, maybe just a bad switch?

 

[Troy T. Blues]

Your issue sounds like it might be tube related.

Don’t know about @matttornado problem, maybe just a bad switch?

I hope so! Ill report back. Thanks

 

[LCW]

I had a 2018 model (first year, right? unless mine was a 2017??)... But I didn't have it long enough before I sold it. Now I have a 2020 that I bought used, so it's got mileage, and so far after 2 months I haven't had any issues. I find the reverb to be very weak, but I think that's a "design feature" lol. I have reverb pedal to use anyway if I want reverb. However if it does start to give me issues, I have a good tech in my area.

 

[ido1957]

I had a JCM900 4100 that started changing channels randomly a couple of years ago. Took it to one tech who wasted my time and money and couldn't fix it. I was lucky enough to discover there was a Marshall warranty specialist in another shop and took it to him. Rather than fight with the problem I just told him to replace the entire switching circuit which he did. Worked perfectly after that. Different amp but thought this might give you some food for thought.

 

[Mitchell Pearrow]

@matttornado
Does it still randomly change channels with the footswitch plugged in ??
Mine are the Dsl40c’s and I have never had this issue, but back when I purchased my V I was demoing it through a cr.. and I had to have a footswitch plugged in for it to stay on the red channel, this was a floor model in SamAsh.

Cheers

 

[Troy T. Blues]

I also bought mine in 2018 when they were more reasonably priced. Last night, half way through rehearsal was the first time I've ever experienced an issue with it. All of a sudden I lost volume/power. Even turning the knobs higher did not yield much difference. No fading or anything like that, just loss of power and it stayed at a certain lower level. I'm hoping it's just a preamp tube. I did not have time to inspect it last night, but I will tomorrow.

I have not experienced the changing channels issue (yet).

I went to where I rehearsal today, brought the whole Doctor bag with all the goodies. I let the amp warm up for about 15-20 minutes and then played for about a half an hour. Nothing....no issues at all. Actually, the dead sound was there when I fired it up, but I noticed that all the EQ knobs were at min. I have no idea how that could've happened? Maybe when I took the cover on and off? I did not notice this when the issue actually happened. So, I'm not sure what the deal is, but once I eq'd it and played, it sounded normal. Strange phenomena!

 

[SkyMonkey]

The only switching fault on my 40CR is that the FX Loop re-sets to OFF each time I turn it on, even though the Loop light is ON.
A quick cycle of the footswitch or panel button makes it good until the next power up.
But this amp never leaves the house, so it can't get any haulage damage.

 

[matttornado]

@matttornado
Does it still randomly change channels with the footswitch plugged in ??
Mine are the Dsl40c’s and I have never had this issue, but back when I purchased my V I was demoing it through a cr.. and I had to have a footswitch plugged in for it to stay on the red channel, this was a floor model in SamAsh.

Cheers

it may have in the past.