Weird power problems with triaxis! help please?

[ade-vege]

HI!

I have a 2.0 triaxis without phat mode.
I´m very happy with sound and everything but there´s something seriously wrong with my triaxis.

When i turn it on the volume is very low at first and after using about an hour
or two it suddenly jumps from low to normal. And at some point again back to low.

Now you think it must be my power amp. But it´s not.
I took all my gear to my tech this fall and everything was checked and tubes were changed to both the triaxis and power amp and my power amp works
just normal with my studio pre.

And the problem is that there´s no mesa boogie official service in finland and my tech don´t know that much about triaxis. He checked it out and he found nothing visible in the boards or anything just that the volume pot had to be cleaned and the loop jacks.

So has anyone had the same problem with their triaxis?
Could it be just my volume pot or what the hell is wrong with the thing?

it´s getting a bit difficult cause you can´t gig with an amp that jumps the volume all the time and is not something you can count on.
And i hate to do gigs with borrowed gear and don´t just have money to buy another triaxis just cause i don´t know what´s wrong with this one.

Hope you can help,

Atte-V

 

[straitouttahell]

Is the volume swinging on both channels?


If so, I would think about a failure on the part of the circuit where the signal is still mono. As a first attempt I would try to swap tubes to see if the problem goes away. If that doesn't fix, I'm afraid this is something you're not going to fix all alone, unless you feel like replacing the opamp that does Dynamic Voice os stuff like that.

If the volume swing is only on one channel, or different for ch A and ch B, I'd try to spray some contact cleaner inside the output volume pots.

Whatever you do, PLEASE always disconnect your preamp from the wall wart and leave it settle like that for a few minutes befor you open it up. There are voltages inside your preamp that could easily kill you, I would not want that to happen to you


EDIT: here you can find the schematic for the TriAxis

http://www.tubefreak.com/schema.htm#triaxis

Perhaps they can be of some help for your tech.

 

[gezza]

Hi all,

Now this may have been overlooked.

It happens to me all the time.

1. Check your cables.

2. Check the inputs, they become sensitive, they may need cleaning.

This has happened to me at a gig, plugged everything in, a got a very low sound.

I reached around the back, wiggled all the leads, and bam, back in business.

Worth a shot.

Gezza.