Post by soulbrotha4u on Jan 4, 2018 20:58:23 GMT -7
Good evening Gents, I’m in need of some help quick. I have a show tomorrow night and my amp is slowly building up hum and releasing sometimes if I strum. The hum is also there if I turn my guitar vol all the way down. Also I still have a rattle in my amp even after I’ve check all nuts and bolts throughout and this amp has seen the doctor once already last year when it had a bad component in the v1 stage. At the time the rattle was still present. Any ways any help would be great! I just had a NYE show opening for Beyoncé’s old drummers band, Nikkie Glaspie with Nth Power. My z was give the sound engineer trouble from the rattle. (Note last year I completely separated the chassis from the cab and still experienced that little metallic rattle. I’m about given up on the rattle. Now the hum is a problem. (Note I’ve switch every tube 1 by 1 and then all of them with difference in outcome) Sorry for the long thread. Please help if ya can. Attached are 2 videos that I just recorded with the symptoms.
Post by Christopher on Jan 4, 2018 21:29:25 GMT -7
Sounds like a tube rattle. I use the little rubber tube dampeners to keep the glass from vibrating. I had a funky hum kinda like what you had in first video and it would come and go w standby switch right after I turned amp on. I replaced the power tubes and haven’t had the problem since. Another thing is keep your cell away from your amp when playing. Ask your bandmate to text you with your phone on amp, full on, not on standby and you’ll hear what I’m talking about. Hope this helps.
Post by soulbrotha4u on Jan 4, 2018 22:08:41 GMT -7
Also the Doc put 2 thin and 1 thick dampening ring around my ef86 v1 position last year but the rattle is still there. I’ve gotten use to it but it has cause some trouble during some studio sessions as well. And now the hum. I just completely unplugged the instrument chord from the amp, let it set turned on for about 20 seconds then it started humming again. If I tap the top of the cabinet it affects the hum a lot.
Well the rattle is in your 6V6 output tubes filaments, very common with JJ 6V6's , replace and also apply damping rings as stated above. To prove it , place on a glove , play the offending note , then grab each 6V6 one at a time and hear the rattle decrease . The hum is a head scratcher , sounds very much like some external source like a cell phone , or power line disturbance. I would need to bench that chassis to determine the source.
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