#1
My ****in amp broke today!

It's a Randall RG50TC ( http://www.musiciansfriend.com/product/Randall-RG50TC-50W-1x12-Guitar-Combo-Amp?sku=481197 )
Today, I came home and no one was home so I decided I'd play my amp cranked, and I remembered that my new tubes weren't running as hot as the old ones (probably because these ones are bigger) so before I didnt anything, I took a screw driver, and turned the knob on the bias thing up a small notch. I guess maybe I pressed a little hard when screwing it, because it kinda bent, so I was like "meh" and moved t back to the original place with tweezers.

then I turned on the amp on standby, and I noted that NONE of the tubes in the back were glowing, so I turned stanby off, and still, the tubes remained un-active (both the 2 power amps, and the 4 pre amps)

what the heck could be the problem?!?!?! please, any help...
#2
I hope you put the same tubes in that you took out. I don't think they should be bigger. Never mess with the bias unless you know what you are doing. I am assuming that you don't, if I'm wrong I apologize. Don't turn that amp back on! Take it to a tech and tell him/her what you did. I hope you just blew a fuse, but even if you replace the fuse it is extremely risky to turn it back on.
#3
yeah, theyre EL34's.....I had some Electro harmonix ones, and these ones are Groove tubes, and they're a bit bigger. this isnt the first time I've used the amp since I've chnaged them, though, it worked fine and was sounding good

I even adjusted the bias pot a slight bit when I got them too, and it worked.
I just didnt think they were running as hot as they should be, so I thought I'd adjust it again before I play today.
(oh, and this isnt an amp where you need to ground it and empty the caps to bias, theres just a screw-knob above each power tube)

oh, and I dont think it's a fuse, I;ve blown fuses before, and when that happens NOTHING on the amp turns on or is active. right now, the only thing that wont turn on is all 6 tubes. the front panel switches and stuff still light up
Last edited by -heartbreaker- at Sep 11, 2007,
#4
My apologies. You obviously know more about tube amps than I do. I wonder if a wire or connection broke behind the bias pot.
#5
is that sarcasm.....I've never known more than someone on any subject.

but yeah, that's what I'm thinking....It bent the pot, now the tubes arent active....
I must fix this, I have a gig on the 27th!