My amp, a JVM215 combo, went all snap, crackle and pop this morning when playing at low volume. It's six months old and has only been gigged once, spending the rest of its time perfectly stationary in my back room.
I popped it open, and found that internal fuse FS6 had blown. I replaced it and it went again within 30 seconds.
It's covered under warranty, so all should be OK there, but what's likely to be the problem? A dodgy valve or something more serious? If it is a dodgy valve, is it a reasonably common occurrence? Also, what's Marshall's warranty repair service like? Am I likely to be without it for an extended period?
It's the first "serious" amp I've bought, and the first ever that I bought new, so it's disappointing to be experiencing a failure so early given that all the other used amps I've bought have had no problems whatsoever.
Comments
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I would try replacing each power valve in turn with the good one from the old pair, in case it's a fault with one of the new ones.
If it isn't, I think you'll need to send it to Marshall since it won't be a valve fault, I don't think - although you should probably replace the phase inverter valve to be sure. If you don't have a spare 12AX7, just swap the two that are furthest away from the input jack. It won't be any of the other preamp valves if it isn't affected by the controls.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
So, as one of the new valves appears to be faulty, should the shop replace or do you think I could get some resistance due to the fragile nature of tubes?
If one of the new valves is faulty - I would make really sure it is that before going any further though - the vendor should replace it. They may want both of the valves back and to supply a new pair.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Milton Keynes (Bletchley) is only an hour down the M1 from you and Marshall's service dept. offer while-you-wait appointments so might be worth giving them a call on 01908 375411.
Rift Amplification
Brackley, Northamptonshire
www.riftamps.co.uk
@ICBM I bought them from Hotrox as they're reasonably local. Never used them before so we'll see.
@peteri the noise wasn't random but the start of it was. Once it kicked in, it was metronomic and would continue until power off if I didn't hammer the strings a bit, almost like it was a capacitor charging and discharging.
Anyway, thanks all for your input folks. I'm keeping everything crossed that it's fixed now but will do more testing tonight.