Hey all. I'm having some trouble with my Mark V combo I wonder if I could bounce off you all. I've
had it about 2 years, purely home use and never leaves my little home studio, and it honestly doesn't
have a whole lot of time on it. I generally run it through a Rivera Rockcrusher Recording for direct
recording, so I think I'm out of luck on the warranty. Never been powered on without a load though.
Since I've had it, it's blown the fuse a couple of times, separated by a few months each time. I
raised an eyebrow, but didn't worry too much about it. A few weeks ago I turned it on (Full Power) and
it immediately made a loud hum and blew the fuse. Replaced the fuse, not too concerned, but when
powered on it did the same thing. Had one more fuse, replaced it and this time watched the tubes when
powering it on, but it blew immediately again with not the slightest light or flash from any tube.
I ordered all new power and rectifier tubes, and per the troubleshooting video removed them all and
powered it on, and it stayed on. Good. Put in the new tubes, powered it on and was going through each
channel testing, but about 15 minutes in on channel 3 I heard a hum. Turned down the guitar, but it was
still there and getting louder. As I turned down the volume on the amp it got very loud...clearly
internal...and the fuse blew. At this point I think I've done all the troubleshooting I can do on my
own, and it'll need to go in for service (sigh), but I'm curious if anyone has any insight or ideas.
An important question though. A few months back I got a new UPS with a voltage readout, and I saw
that my line voltage from the wall outlet was running kinda hot...averaging between 124-128 volts. For
a while it was even more, hitting 130-131 in the overnight hours, and the UPS was actually kicking in
and outputting 110v, presumable because of the high voltage. Could this have caused cumulative damage
to the amp? I don't think I'm getting large spikes, and I do have a lower end Furman power conditioner
in the rack that I power the amp from, but I'm concerned about the sustained high voltage.
I'm extra concerned now as I have a line on a really good deal on a Mesa Mini Rectifier for a
"backup", but I don't want to burn that up, or my Mark V after I (hopefully) have it repaired. Any
insight is appreciated.
Thanks in advance,
Larry
had it about 2 years, purely home use and never leaves my little home studio, and it honestly doesn't
have a whole lot of time on it. I generally run it through a Rivera Rockcrusher Recording for direct
recording, so I think I'm out of luck on the warranty. Never been powered on without a load though.
Since I've had it, it's blown the fuse a couple of times, separated by a few months each time. I
raised an eyebrow, but didn't worry too much about it. A few weeks ago I turned it on (Full Power) and
it immediately made a loud hum and blew the fuse. Replaced the fuse, not too concerned, but when
powered on it did the same thing. Had one more fuse, replaced it and this time watched the tubes when
powering it on, but it blew immediately again with not the slightest light or flash from any tube.
I ordered all new power and rectifier tubes, and per the troubleshooting video removed them all and
powered it on, and it stayed on. Good. Put in the new tubes, powered it on and was going through each
channel testing, but about 15 minutes in on channel 3 I heard a hum. Turned down the guitar, but it was
still there and getting louder. As I turned down the volume on the amp it got very loud...clearly
internal...and the fuse blew. At this point I think I've done all the troubleshooting I can do on my
own, and it'll need to go in for service (sigh), but I'm curious if anyone has any insight or ideas.
An important question though. A few months back I got a new UPS with a voltage readout, and I saw
that my line voltage from the wall outlet was running kinda hot...averaging between 124-128 volts. For
a while it was even more, hitting 130-131 in the overnight hours, and the UPS was actually kicking in
and outputting 110v, presumable because of the high voltage. Could this have caused cumulative damage
to the amp? I don't think I'm getting large spikes, and I do have a lower end Furman power conditioner
in the rack that I power the amp from, but I'm concerned about the sustained high voltage.
I'm extra concerned now as I have a line on a really good deal on a Mesa Mini Rectifier for a
"backup", but I don't want to burn that up, or my Mark V after I (hopefully) have it repaired. Any
insight is appreciated.
Thanks in advance,
Larry