My jcm2000 dsl100 did the same. The solder joints on the input jack were cracked. I just reflowed the solder and all was goodI've had my DSL100 head for about 8 years now... 90% of the time it works great. I've had occasional had issues where it would suddenly cut out or have a sudden volume drop, but that usually clears up within a matter of seconds, and those incidents thankfully have been extremely rare.
last night I went to band practice... we took a break from playing for about two months, so this was our first jam session after the break. my amp generally sits in our singer's basement most of the time, which is where our jam room is. while its there, it doesn't get touched at all, ever. at last night's band practice, after letting it sit on (on standby) for a few minutes, I turned my amp on, and immediately got a very unusual static-y humming noise. it clearly sounded like something was wrong. I turned it up to normal volume and played, but almost nothing was coming out. only about 5% of how loud it should be. then the power suddenly died. it just turned itself off. I opened the fuse compartment and replaced the fuse that was in there with the spare. even though visually, the fuse did not look burned out at all. I turned the amp back on and kept it on standby for a few minutes. I flipped the standby switch and heard the same troublesome static-y loud humming (this is on the green channel with the gain on 2 and the pre-amp on 2 as well). barely any audio coming out of the amp at all. I flipped the standby back on. I looked at all the tubes. they seemed to be all glowing normally. I then decided to flip the pentatode switch from 100 to 50 watts... it then emitted a loud whiney squealing noise (sounded like a theramin), so I put it back on standby and flipped it back to 100 watt mode. I let it sit for a few more minutes, and got the same results... I then turned it off for 15 minutes, turned it back on, and still no difference. I messaged a friend of mine who is a very experienced music engineer, and guitarist, and knows a lot about guitar gear and amps, explained the situation to him, and he thought that it almost certainly is an issue with the power tubes, with about 90% certainty. I've never re-tubed an amp before. all I know is that I very well may need a brand new, matched 4-set of EL34 power tubes. I plan on bringing it to an amp tech nearby sometime soon to have it checked. I've estimated that I'm probably going to be out roughly 300 bucks, approximately (considering the cost of the tubes and the work).
that being said, does anyone else here have any input about this? anyone else had this same problem? does it seem like the tubes or possibly something else? I was thinking about spraying all the jacks with some DeOxit to see if that helps at all. I've had a similar issue happen before with another amp, and DeOxit cleared it right up.
DSL100 head issue
- Thread starter GibsonMarshallGuy47
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My jcm2000 dsl100 did the same. The solder joints on the input jack were cracked. I just reflowed the solder and all was good
GibsonMarshallGuy47
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well, $240 later, my amp tech made it good as new. and I was only without it for a week. not bad at all. I don't know what else he did other than replace all the power tubes, but the dude is THE amp wizard in the Philly area, and has been for decades now... it sounds back to normal. hopefully it will last another 8 years before I have to have maintenance work done on it.
PelliX
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Nice! I'm still a little wary about it popping a fuse. Generally the HT would blow if the valves were causing the issue. Seeing that transporting it seemingly "cured" the issue for a while, I'm thinking along the lines of a dodgy contact somewhere. Dodgy jacks or even cracked solder joints wouldn't cause anything to blow. If it's an older JCM2000 I'd be looking at the speaker jacks or at least verifying with the tech that this has been checked/addressed or is not applicable for your model. Just my
