Joe Posted July 5, 2016 Posted July 5, 2016 Hi all. I'm having a small problem with my 50. Twice now it has gotten staticky, then the volume slowly dropped to zero. I switched the standby switch off and on and the amp worked fine. Happened once during a gig and once at rehearsal. I opened the back, all the tubes are lit up. Any suggestions ?
JeffB Posted July 5, 2016 Posted July 5, 2016 Im pretty sure this isnt the best advice so take it with a grain of salt. "Nearly" everytime Ive had a problem like that just cleaning the power and standby switch, input jack, fx loop in/outs and speaker input with deoxit or something similar generally gets things going again. If this fails for me I sometimes spray the tube pins. Thats generally never had a worthwhile result though. Thats all from the peanut gallery.
Joe Posted July 5, 2016 Author Posted July 5, 2016 Im pretty sure this isnt the best advice so take it with a grain of salt. "Nearly" everytime Ive had a problem like that just cleaning the power and standby switch, input jack, fx loop in/outs and speaker input with deoxit or something similar generally gets things going again. If this fails for me I sometimes spray the tube pins. Thats generally never had a worthwhile result though. Thats all from the peanut gallery. I was thinking along those line as well. I did remove and reset the tubes. Do I have to remove the switches to clean them or just spray contact cleaner into them?
DetroitBlues Posted July 5, 2016 Posted July 5, 2016 Tubes come to mind for me too. In fact, how old are they?
ElNumero Posted July 5, 2016 Posted July 5, 2016 I had a problem similar with my C50 and it was one bad tube
Joe Posted July 5, 2016 Author Posted July 5, 2016 Tubes come to mind for me too. In fact, how old are they? Tubes are probably a year or so old. Maybe as much as two. I have a new set of power tubes. I'll swap those now.
JeffB Posted July 6, 2016 Posted July 6, 2016 I was thinking along those line as well. I did remove and reset the tubes. GDo I have to remove the switches to clean them or just spray contact cleaner into them?just spray them and flick them on and off a few times.I dont know if this is The problem though. Its just where i start before swapping tubes or spending money.
TalismanRich Posted July 6, 2016 Posted July 6, 2016 Hi all. I'm having a small problem with my 50. Twice now it has gotten staticky, then the volume slowly dropped to zero. I switched the standby switch off and on and the amp worked fine. Happened once during a gig and once at rehearsal. I opened the back, all the tubes are lit up. Any suggestions ? Â I had a similar sounding problem with my Patriot a few years ago. It would have static when first turned on, and lose volume. A cycle or two and it would come back. It finally went out, and sounded like a dead short across the inputs. My repair guy found a bad resistor, (screen grid resistor If I recall correctly). He replaced the resistor, we put in a new set of Ruby tubes and its been solid ever since.
Joe Posted July 6, 2016 Author Posted July 6, 2016 Cleaned the switches, replaced the tubes, gonna give it a whirl.
Joe Posted July 12, 2016 Author Posted July 12, 2016 Any luck? Haven't had a chance to test it yet. Rehearsal tonight, gig Saturday. I may know something after that.
Joe Posted July 12, 2016 Author Posted July 12, 2016 Sounds like it may be a rectifier tube. Other than taking it to a tech, can I check that myself?
t0aj15 Posted July 12, 2016 Posted July 12, 2016 Sounds like it may be a rectifier tube. IIRC my Classic 50 head didn't have a tube rectifier, it was SS. But I got rid of it MANY years ago so I could be wrong.
pressure Posted July 12, 2016 Posted July 12, 2016 When a rectifier tube went bad in my amp (Victoria Deluxe) it blew a fuse at the same time. I don't know if that always happens or if it was just this amp. I replaced the tube and fuse and everything was fine.
TalismanRich Posted July 13, 2016 Posted July 13, 2016 No rectifier tubes in the Classic 30 or 50. Both use SS rectifiers. 4 EL84 power tubes and 3 12AX7s. The 50 also has a fan to keep things cool.
Joe Posted July 13, 2016 Author Posted July 13, 2016 Amp worked well at rehearsal last night. No buzz or hum at idle. New tubes seemed to have done the trick. Thanks to all for the input.
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