dr150 Posted December 9, 2015 Share Posted December 9, 2015 Just received a new DT25 112 Combo amp and having issues. There's a very high/noticeable amount of electrical noise using this amp in ANY setting (any dial...i.e. drive, presence, volume, master, class A/AB, pentode/Triode, etc). The electrical noise only quiets down when you reduce the volume to too low a volume. Already at 10 o'clock dial setting the noise is marked....and every setting in the recommended Voice plastic cutout sheet that came with the amp is noisey as hell. Overdrive is a joke in noisiness. Cleans should be silent and aren't. Power cord is in a balanced electrical outlet and cables are shielded. I've had tube amps before in same wall socket/cables and none were as electrically noisey as this unit. It's deal breaking annoying. MY GUESS: 1.) Bad tubes 2.) Broken unit (i.e. needs servicing) Any advice?..... Quote Link to comment Share on other sites More sharing options...
DarrellM5 Posted December 9, 2015 Share Posted December 9, 2015 My #1 suspect in this case would be one or more tubes. It's possible that one might not be seated well after shipping. Quote Link to comment Share on other sites More sharing options...
Brazzy Posted December 10, 2015 Share Posted December 10, 2015 Just received a new DT25 112 Combo amp and having issues. There's a very high/noticeable amount of electrical noise using this amp in ANY setting (any dial...i.e. drive, presence, volume, master, class A/AB, pentode/Triode, etc). The electrical noise only quiets down when you reduce the volume to too low a volume. Already at 10 o'clock dial setting the noise is marked....and every setting in the recommended Voice plastic cutout sheet that came with the amp is noisey as hell. Overdrive is a joke in noisiness. Cleans should be silent and aren't. Power cord is in a balanced electrical outlet and cables are shielded. I've had tube amps before in same wall socket/cables and none were as electrically noisey as this unit. It's deal breaking annoying. MY GUESS: 1.) Bad tubes 2.) Broken unit (i.e. needs servicing) Any advice?.. Maybe you should do a support ticket if it's new. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted December 18, 2015 Share Posted December 18, 2015 Yes, a Support Ticket. Quote Link to comment Share on other sites More sharing options...
ozbadman Posted December 21, 2015 Share Posted December 21, 2015 MY GUESS: 1.) Bad tubes 2.) Broken unit (i.e. needs servicing) Any advice?..... Is it hum or fizz? hum: 1. earth loop 2. bad insulation fizz: 1. bad grounding on your guitar 2. bad cable plus your ideas. To try to isolate the problem I would (maybe you have already done this): 1. try another cable 2. try another guitar 3. try nothing plugged in and turn the amp up. See if the buzz is still there with no input signal Quote Link to comment Share on other sites More sharing options...
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