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I have a 2003 DSL 50 that I bought used a few years ago. The Ultra Gain channel has developed an unnatural loud hum that appears to get louder as the session continues. The Classic Gain channel does not have a hum. The Ultra Gain hum becomes noticeable only when the standby switch is on and a guitar/cable is plugged in. The volume affects the level of hum noise. I also own a reissue 1987x and I have owned a DSL100 before and have never heard a hum like this before. I recently had a local tube amp repair man with a good reputation, and who I've used before, look it over and after 20 hours of his time he couldn’t find the problem and didn’t charge me.

He even suggested that it very well could be a design flaw. But, he agreed that was odd since the hum wasn’t always present with this amp. The power tubes are new and biased properly. The filter caps among other relative components have been checked “five times over”. The output and power transformers heat up and check out in good order.

There doesn’t appear to be any modifications to this amp. Any thoughts on what is missing in the diagnosis, or could it really be a design flaw that developed over time? Thanks for the assist. Noob Posts: 5 Joined: Sat Sep 20, 2014 12:10 am. There isn't much difference in the signal path between the lead and crunch channels.

1) In the 20 hours of his time, did your tech try replacing V1? V1a is part of the additional gain stage for the lead channel.

2) When you get the hum, is that ONLY with the guitar cable plugged in? 3) Do you get the same hum when you plug directly into the power amp? If he did replace V1 with a good tube and the tubes are all 100% tested and good, I would use a simple debugging technique, which is basically following the signal path and grounding at at various points in the signal path until you find the source of the problem. Its easy and simple and after 1 hour, 2 hours max, the problem should be located to only a few components.

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Which tube board revision do you have? It is printed on the board and you can find a explanation as to how to find it on this page, under Marshall DSL Schematics and board info. Thanks for the reply. I have replaced the preamp tubes one by one with a working set from a plexi and the loud hum is still there. The hum is ONLY present with the guitar cable plugged in and standby 'on'.

There is also a slight 'pop' sound when the channel switch is pressed in or out. Not sure about 'plug directly into the power amp,' I am plugging the instrument cable into the 1/4' input on the face of the amp and the power source cord in the back? Nonton anime hatsune miku sub indo. Board ID is JCM2-61-00, so I believe the revision number would be '00'. Someone in another forum mention a possible bad 'hum balance pot'. I plan on running another set of preamp tubes to be sure about the tubes diagnosis. Noob Posts: 5 Joined: Sat Sep 20, 2014 12:10 am. Plugging into the power amp is as easy as plugging into the effect return jack.

The fact that there is no hum when the guitar cable is NOT plugged in leads me to believe that the problem may not be with the amp itself. Could the environment in which you play the amp have changed? Maybe a guitar cord isn't shielded properly, dirty connections through effects pedals? Dirty input jack on the amp or the guitar?

The problem happen when you plug straight in, no effect pedals, nothing. Just guitar and amp. Plugging the guitar directly into the effects return jack alleviated the obnoxious noisy hum I have been receiving from plugging the guitar through the input jack on the front of the amp. But, the environment the amp is in hasn't changed, there are other amps there too and they perform normally. I have tried numerous instrument and speaker cables, guitars, speaker cabs, no effects in the signal chain, but I get the same results only with this DLS50. Also, when the amp was with the amp serviceman he was getting the same issues. The only other possible link in the chain you mention is the input jack itself, which I will look at next.