Members cantoXIII Posted October 9, 2005 Author Members Posted October 9, 2005 Originally posted by anti-flag193 yeah, I had sort of the same problem and went to radio shack and got a multimeter for 30 bucks, went home and found out that all my fuses were ok. Now, I've eliminated that as a problem. what did your problem end up being and how did you fix it? well since i have no way of knowing whether the fuses and tubes are good or not, it appears i'll be taking it to a tech. suck. and the mute button...ha. i've only been fooled by that once, at the first show i ever used the head at. i was scared {censored}less until i found that little button.
Members kannibul Posted October 9, 2005 Members Posted October 9, 2005 Originally posted by cantoXIII so i'm going to destroy something right now. i play my amp [marshall tsl100 head] everyday and last night my sound started to cut out and distort. today, at band practice, it completely cut out and isn't working anymore. at all. we changed cables and cabs and guitars, and the problem had to be the amp.i've looked at it. all the tubes are working and everything is hooked up perfectly, ohm's correct, etc...i'm getting no sound whatsoever. any ideas what it might be? Given those symptoms, tubes are the problem, unless you switched them all out with a known good set.
Members Northern1 Posted October 9, 2005 Members Posted October 9, 2005 Isn't there a 5 year warranty on the JCM2000 amps?? I would check with Marshall then take it in.
Members dreamspace Posted October 9, 2005 Members Posted October 9, 2005 I got the same problem once, when I owned a Laney GH100L... Volume started to fade out a bit, and the tone was crap(when I still had sound that is.. ) the amp would turn on, and tubes glow.. but no sound.. changed to fuses, and the amp was live and kickin'
Members cantoXIII Posted October 9, 2005 Author Members Posted October 9, 2005 Originally posted by dreamspace I got the same problem once, when I owned a Laney GH100L... Volume started to fade out a bit, and the tone was crap(when I still had sound that is.. ) the amp would turn on, and tubes glow.. but no sound.. changed to fuses, and the amp was live and kickin' so you just changed the fuses then? i'll get some new ones soon, if nothing else than to just have an extra set. will i be able to pick these fuses up at any given hardware store?
Members dreamspace Posted October 9, 2005 Members Posted October 9, 2005 Originally posted by cantoXIII so you just changed the fuses then? i'll get some new ones soon, if nothing else than to just have an extra set. will i be able to pick these fuses up at any given hardware store? yeah, try the fuses first. And you can buy them at your local hardware/electronics store
Members anti-flag193 Posted October 9, 2005 Members Posted October 9, 2005 Originally posted by cantoXIII what did your problem end up being and how did you fix it?well since i have no way of knowing whether the fuses and tubes are good or not, it appears i'll be taking it to a tech. suck.and the mute button...ha. i've only been fooled by that once, at the first show i ever used the head at. i was scared {censored}less until i found that little button. well my issue was with my 5150II. I checked all the basics first (tubes, fuses) and realized I burnt one of the ribbon cables and I think that {censored}ed up something else. I'm sending it to Jerryp tomorrow.
Members cantoXIII Posted October 11, 2005 Author Members Posted October 11, 2005 alright. so i took the fuses out of my brother's TSL that is guaranteed working [we used it yesterday], and put them into mine. the amp had sound this time, but it was still cutting in and out terribly. another 25 seconds went by, and it went dead again. this time, when i would play something, there would be an ever so quiet almost rattling noise coming from the back of the inside circuitry. he started adjusting the cab cable and it worked for about 3 seconds, then cut out. we tried the other jack still to no avail. any new ideas?
Members JerryP Posted October 11, 2005 Members Posted October 11, 2005 Take it to the tech. I know you don't wanna hear that, but the more you play it the more damage you might be doing. It could cost you more in the long run.Jerry
Members cantoXIII Posted October 11, 2005 Author Members Posted October 11, 2005 Originally posted by JerryP Take it to the tech. I know you don't wanna hear that, but the more you play it the more damage you might be doing. It could cost you more in the long run.Jerry you don't think new tubes would fix it? i bought this head off of eBay about 6 months ago, so i'm sure that it could use some new tubes, as i have no idea if/when the last guy put tubes into it.
Members VanR Posted October 11, 2005 Members Posted October 11, 2005 Sounds silly but try sticking a guitar cord plug in and out of the effects send jack. Sometimes these switching jacks get dirty and don't make contact therefore breaking the signal circuit. I've seen a lot of amps with this simple problem.
Members JerryP Posted October 11, 2005 Members Posted October 11, 2005 Originally posted by cantoXIII you don't think new tubes would fix it? i bought this head off of eBay about 6 months ago, so i'm sure that it could use some new tubes, as i have no idea if/when the last guy put tubes into it. I doubt it. That's not really a common symptom of a bad tube. Usually even with a bad tube the amp will still make noise unless the tube is shorted and in that case it will usually blow a fuse.The TSL/DSL Marshalls have a problem with the speaker jacks and this can cause output transformer failure. I've changed several because of this. What you're describing sounds similar to what my customers complaints were. It could be something simple and stupid. But it might not be and continuing to play the amp may be doing more harm than good.Jerry
Members cantoXIII Posted October 11, 2005 Author Members Posted October 11, 2005 Originally posted by VanR Sounds silly but try sticking a guitar cord plug in and out of the effects send jack. Sometimes these switching jacks get dirty and don't make contact therefore breaking the signal circuit. I've seen a lot of amps with this simple problem. wait, explain this again? stick one instrument cable into the send AND return effects loop inputs? i completely unplugged my effects loop from the amp and still no sound... i already smashed a beer bottle in our basement and i got about 50 more in our recycle bin if this bitch doesn't get working soon.
Members Sir Don Posted October 11, 2005 Members Posted October 11, 2005 I think you've just about exhausted all the avenues here. Tech time.
Members PGS412 Posted October 11, 2005 Members Posted October 11, 2005 Originally posted by cantoXIII wait, explain this again?stick one instrument cable into the send AND return effects loop inputs?i completely unplugged my effects loop from the amp and still no sound...i already smashed a beer bottle in our basement and i got about 50 more in our recycle bin if this bitch doesn't get working soon. He's explaining to insert & then remove a 1/4" plug in the Effects loop jacks to clean the inside of the jack I had my effects loop give me a drama on another amp, but the symptoms were not like yours. I've had power tubes fail & still the symptoms were not like yours Do yourself a favor, calm down (Yes put down that bottle) & take the amp to a tech...
Members kannibul Posted October 11, 2005 Members Posted October 11, 2005 Originally posted by cantoXIII alright.so i took the fuses out of my brother's TSL that is guaranteed working [we used it yesterday], and put them into mine. the amp had sound this time, but it was still cutting in and out terribly. another 25 seconds went by, and it went dead again.this time, when i would play something, there would be an ever so quiet almost rattling noise coming from the back of the inside circuitry. he started adjusting the cab cable and it worked for about 3 seconds, then cut out. we tried the other jack still to no avail.any new ideas? IT'S A DAMN TUBE!!!
Members kannibul Posted October 11, 2005 Members Posted October 11, 2005 Originally posted by JerryP I doubt it. That's not really a common symptom of a bad tube. Usually even with a bad tube the amp will still make noise unless the tube is shorted and in that case it will usually blow a fuse.The TSL/DSL Marshalls have a problem with the speaker jacks and this can cause output transformer failure. I've changed several because of this. What you're describing sounds similar to what my customers complaints were. It could be something simple and stupid. But it might not be and continuing to play the amp may be doing more harm than good.Jerry I've had tubes casue cutting in out, easpecially if you consider that he's talking about how after it's been running fine for a while, it then cuts out. Sounds to me more like a weld inside the tube is OK when it's cold, but as the tube heats up, it gets intermittent, then nothing.
Members BOOGIE666 Posted October 11, 2005 Members Posted October 11, 2005 Try and kill me {censored}er.
Members JerryP Posted October 11, 2005 Members Posted October 11, 2005 Originally posted by kannibul I've had tubes casue cutting in out, easpecially if you consider that he's talking about how after it's been running fine for a while, it then cuts out. Sounds to me more like a weld inside the tube is OK when it's cold, but as the tube heats up, it gets intermittent, then nothing. I didn't say it couldn't be a tube, it's not very likely for a tube to fail like that. Based on the service history of these amps that I've seen here in the shop the chances are far better he has a bad speaker jack and he will need an output transformer if he keep playing it. It could be something simple and not be that, but my money is on the jack. I can tell you two things for sure. Breaking bottles isn't anywhere in the books as a repair for amp problems. If the jack is bad, he's only making the repair bill increase by trying to fix it himself. Jerry
Members georges Posted October 11, 2005 Members Posted October 11, 2005 Originally posted by cantoXIII as for the one ohm resistors, i'm definitely not going to screw with those myself, i know my amp could kill me [literally and metaphorically]. i normally use a Holland 8-ohm 2x12. sometimes, a home-made 4-ohm 4x12 cab. i make sure to always switch the ohm adjuster everytime i change cabs. enfilade is, besides one armed scissor, ATDI's best song. in the vinyl version i have, i swear to god there are sounds in the beginning of that song that aren't on the cd. when the phone is ringing, there are background noises that are oh so quiet...it's pretty amazing. Kickass song. I love that, catacombs, ILD. Good band
Members georges Posted October 11, 2005 Members Posted October 11, 2005 Originally posted by cantoXIII that's what i was afraid of. Can't beat extracurricular and Proxima Centurai. Not to mention Doorman's Placebo. I love em.
Members cantoXIII Posted October 12, 2005 Author Members Posted October 12, 2005 Originally posted by JerryP I didn't say it couldn't be a tube, it's not very likely for a tube to fail like that. Based on the service history of these amps that I've seen here in the shop the chances are far better he has a bad speaker jack and he will need an output transformer if he keep playing it. It could be something simple and not be that, but my money is on the jack.I can tell you two things for sure. Breaking bottles isn't anywhere in the books as a repair for amp problems. If the jack is bad, he's only making the repair bill increase by trying to fix it himself.Jerry my only question with this...is why did neither speaker jack work whatsoever? i tried both of the 4/8 ohm jacks and neither produced sound. i haven't turned it on since last night, according to your recommendations, and i don't plan to until i talk to a tech. however, kannibul had the same idea that i did. it seems to work fine when the tubes are cold, but as soon as they get warmed up it stops working. obviously that's still an issue for a technician, but is that more likely than the jack? i mean, why would the jacks all of sudden both go out in a matter of a few minutes, after working fine for months? arrghh...those bottles are just asking to be broken...i can hear them whispering "kill me, smash me!" whenever i go by them.
Members JerryP Posted October 12, 2005 Members Posted October 12, 2005 To understand this you have to understand how the speaker jacks are wired on that amp. The ground for the output transformer connects to the ground terminal of the speaker jacks. The problem with the TSL/DSL amps is that Marshall ran the ground circuit thru the switching portion of the 16 ohm jack to the two other jacks (4and 8). As most guys know those switching jacks can get dirty and corroded as is evidence with almost every amp out there that uses an effects loop. The loop jacks get dirty and the amp cuts out.In your amp they have it designed like that so that when you plug into the 16 ohm jack it disables the other two jacks. The problem is contacts of the 16 ohm jack get dirty and they can't handle the amount of current going thru them. The jack melts as seen in the picture I posted. This is an extreme failure. Looking at the ground portion of that jack you can see the dull color of the metal instead of the normal shiny surface. The metal was over heated. The output transformer can and does usually fail long before the jack looks that bad. This problem only shows up for guys that run cabinets in the 4/8 ohm jacks. Anyone just running a 16 ohm cab in the 16 ohm jack will never experience this.This may not be the problem at all with your amp. My concern is that if it is, you may do further damage.As for the amp working when cold, the switch contact can expand and loose connection when they get hot. If it were a bad weld in a tube as suggested it would happen hot or cold. They don't re-weld themselves.Jerry
Members kannibul Posted October 12, 2005 Members Posted October 12, 2005 Originally posted by JerryP To understand this you have to understand how the speaker jacks are wired on that amp. The ground for the output transformer connects to the ground terminal of the speaker jacks. The problem with the TSL/DSL amps is that Marshall ran the ground circuit thru the switching portion of the 16 ohm jack to the two other jacks (4and 8). As most guys know those switching jacks can get dirty and corroded as is evidence with almost every amp out there that uses an effects loop. The loop jacks get dirty and the amp cuts out. In your amp they have it designed like that so that when you plug into the 16 ohm jack it disables the other two jacks. The problem is contacts of the 16 ohm jack get dirty and they can't handle the amount of current going thru them. The jack melts as seen in the picture I posted. This is an extreme failure. Looking at the ground portion of that jack you can see the dull color of the metal instead of the normal shiny surface. The metal was over heated. The output transformer can and does usually fail long before the jack looks that bad. This problem only shows up for guys that run cabinets in the 4/8 ohm jacks. Anyone just running a 16 ohm cab in the 16 ohm jack will never experience this. This may not be the problem at all with your amp. My concern is that if it is, you may do further damage. As for the amp working when cold, the switch contact can expand and loose connection when they get hot. If it were a bad weld in a tube as suggested it would happen hot or cold. They don't re-weld themselves. Jerry I had a set of tubes that would arc-weld themselves into working. Turn the amp on after standby, about 3 minutes later SQUEAAAAALL for about 10-20 seconds, then it would go intermittent, the squeals would get shorter, eventually just pops, then the amp would continue working as normal, until I shut it off. Scared the piss out of me the first time it happened. Then I wanted to find out WTF was happening, and I pulled teh back panel off, and let it just "run" for a while - I saw a bright arcing between the base and plate, right where the weld was supposed to be. That was my "first" TSL - which AMS, instead of sending me new tubes, requested the whole amp back, and had one on its way to me. I didn't say no... FWIW, I'm not debating your expertise by any means - just I'm saying that I've experienced some odd things with tubes that might apply
Members air guitar Posted October 12, 2005 Members Posted October 12, 2005 Originally posted by cantoXIII i haven't turned it on since last night, according to your recommendations, and i don't plan to until i talk to a tech. That's a good idea. You don't want to send it over the edge. A good tech can find the problem real fast. It sounds like a worn power tube. But let a pro take care of it. That's what I do. I'm better at playing guitar than I am at fixing amps.
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