troubleshoot
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DSL20HR weird thump in 20 watt mode
Hi everyone, I love my DSL20HR, but every time I put it in 20 watt mode, I get a weird thump that sounds like someone knocking on a door through the cab. I guess it's somewhere in the power amp, but I'm not sure. I got both amp and cab used. Anyway, hopefully someone has experienced this issue...- TCF805
- Thread
- cabinet knock power amp thump trouble shoot troubleshoot weird noise
- Replies: 13
- Forum: Marshall Amps
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Bugera 1960 Infinium #4 tube light permanently on/flashing with brand new tubes
Bought a Bugera 1960 Infinium brand new in 2018 for $399 off Sweetwater, bought it for it's value - really good sounding amp, replaced the EL34s with brand new JJs twice now. Also replaced the power tubes with JJs. I noticed that pretty much since I got the amp the #4 tube light has always been...- LionsTheBoss
- Thread
- bugera bugera 1960 infinium help troubleshoot
- Replies: 22
- Forum: The Workbench
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Code 25, Ugly and Buzzing output after a strong feedback
Hi, after turn on my CODE 25 at very high volume with a mic turned on I almost got deaf with the strong feedback. I turned off the Amp in 1 second... But after that all the low tones/frequencies are distorted/buzzing/ugly don't know how to explain (E string with or without Cab, Amp, Mod, Rev...- Fabio Fujita
- Thread
- code code 25 issue schematics troubleshoot uggly output
- Replies: 24
- Forum: Marshall Amps
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JCM800 2204 has very little preamp gain/distortion(?)
It has very little gain even with the preamp knob on 10 and the master at about 7. Even running a TS9 with its vol max and gain at zero into the amp doesn't get me anywhere close to the gain it used to have. It's still loud as hell, just no gain. I don't think it's the EL34s, and the pots are...- James Ford
- Thread
- 2204 jcm800 low distortion low gain no distortion no gain too clean troubleshoot troubleshooting
- Replies: 13
- Forum: The Workbench
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blowing fuses on my JCM 800
I can't keep it running anymore. I put in a new fuse, and it blows right away. This started because I accidentally moved the amp and dislodged one of the speaker cables. It just deteriorated from there, and now it does not work. I also blew a preamp tube, a new production Mullard, and that...- Dwayne Eash
- Thread
- cable test diagnose fuse fuses jcm 800 slow blow troubleshoot
- Replies: 379
- Forum: The Workbench
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JCM 900 FX Return Broken
Hi all, I have a JCM 900 4100 and the FX return is not working. I can get a signal out of the send just fine, but if i try to put any signal into the FX return, I get nothing. If I bridge the send and return with a patch cable, when I crank the master volume I get a very low volume...- Ryan Morris
- Thread
- broken effects loop fx loop jcm 900 jcm 900 4100 marshall not working return troubleshoot troubleshooting
- Replies: 20
- Forum: The Workbench
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Dsl40c-troubleshoot Help!
Hello. I have not been able to find a thread talking about the symptoms of my troubled dsl40c. Could anyone please point me in the direction of a component to test? Here are the symptoms and what I have done so far: -No sound output -!No channel led lights on. ! I have not seen this symptom in...- Brennan
- Thread
- dsl dsl40c led no sound troubleshoot
- Replies: 15
- Forum: The Workbench
