EVH 5150 III fault on first run, Anyone help working out the problem please.

[DigitalMetal]

Ok so my guitarist got a new EVH 5150 III Head and cab and brought it down for its first run at our band rehearsal tonight,

We hooked it up with a new speaker lead to its matching cab, observing that its a 16 Ohm cab we switched the impedance selector on the head to 16 Ohms.

Set both the power and stand by switches to off, hooked up the mains cable,
Switched the power switch on, waited a couple of minutes for the tubes to warm up and glow,
Then switched the standby off and let him play while i tweaked the tone and gain of channel 3 to get a good metal tone,
1 minute later the sound cuts (i think i saw a blue flash from the tubes but i cant be 100% sure).

So no we have no sound and a very pissed guitarist!

The main power light is on and all the tubes are glowing (i even removed the aluminum covers from the 12AX7 Preamp tubes later on this evening to check them).
but we get no sound,
it seems that the pre amp is working fine because if i route the pre amp out socket or the FX send socket to a seperate amp its producing sound, but if i route an external sound (a separate amps FX Send) to FX return of the 5150 theres nothing, so it seems like we have a power amp problem.

There are 4 6V6 Tubes and as i said they all glow fine like they are working, i swapped them all around with each other to see if that made a difference but still nothing,

Has anyone seen this before or can suggest some basic tests we can do?

Im not going to open the amp casing up as its brand new and still under warranty and we do not have any spare tubes to try, so there may be nothing we can try, but just in case i thought i would pose the question here,

Thanks!

 

[JeffTD]

If it is indeed brand new and under warranty, I wouldn't screw around with new tubes at all - I'd just take it back and get another. Way less headache and worrying down the road, to be sure.

 

[metalfanat1c]

If it is indeed brand new and under warranty, I wouldn't screw around with new tubes at all - I'd just take it back and get another. Way less headache and worrying down the road, to be sure.

Especially since the guy thinks there's 4 6v6es in it...


They're 6L6es.

 

[chrisjmp]

I let a friend use an amp of mine for a while, and when I got it back, it had a similar problem. When I got it checked out, it ended up being the output tranny

 

[DigitalMetal]

If it is indeed brand new and under warranty, I wouldn't screw around with new tubes at all - I'd just take it back and get another. Way less headache and worrying down the road, to be sure.

Yeah thats what we'll do, just interested to hear if this has happened to others and what the cause was.

Especially since the guy thinks there's 4 6v6es in it...


They're 6L6es.

Call it a typo

I let a friend use an amp of mine for a while, and when I got it back, it had a similar problem. When I got it checked out, it ended up being the output tranny

That sounds quite plausible in this case actually, Thanks

 

[DigitalMetal]

Sorry i never came back with, how we fixed it, but it was a fuse on the board inside the Amp, total PITA to have to open it up to replace the fuse, I wish they were all chassis socket fuses to save opening it.
After replacing the blown fuse with a slow blow rather than fast its been fine ever since.

 

[mburton21]

Mine did it the first night I had it, it cut out exactly like you said. Mine came back on if you switched channels, still sucky though.

I just took it back and they replaced it on the spot with one that works like a hot damn.

Sexy amp