TRIAXIS / 2:90 Problem... Please help

[Fret-Shredder]

I have been having a problem with my TRIAXIS VER. 2.0 / 2:90 set up. Here is what I am experiencing. After a few minutes of playing the VOLUME drops in and out a little bit and comes back up on its own. Not a huge amount but noticeable. Does anyone one have a idea whats going on? Is it a TRIAXIS TUBE issue or could it be one of the 6L6s in the 2:90. PLEASE HELP. Thanks in advance , Mike

 

[dass101]

Try to isolate the problem. First of all, use a different power amplifier, and see if the problem is on the TA or the 2:90. It most likely is in the TA.
Then, try to see if all the outputs of the TA exhibit the same problem: Out A, out B, send, rec out. Depending on that, the problem could lie in different places.

 

[TOOLGUY]

Man I was just going to post before I read this.
My 2:90 is doing the same thing! I run stereo and my "a" channel
keeps dropping out. the volume will cut out and sound very "tinny or thin'.
If I play with the standby or power switch I can get the channel to come back on for a few but it will drop out again and again.

Does anyone know How the 6L6 tubes are laid out (ie. is the top row the "a" channel or are they stacked side by side)? I was going to try swapping the a and b 6l6 tubes to see if it helps but need the layout before I do. I have a bad feeling it's not the tubes causing this.

Fret- are you running mono? If so try running out of the other channel and see if it's still doing it.

 

[steve_k]

Man I was just going to post before I read this.
My 2:90 is doing the same thing! I run stereo and my "a" channel
keeps dropping out. the volume will cut out and sound very "tinny or thin'.
If I play with the standby or power switch I can get the channel to come back on for a few but it will drop out again and again.

Does anyone know How the 6L6 tubes are laid out (ie. is the top row the "a" channel or are they stacked side by side)? I was going to try swapping the a and b 6l6 tubes to see if it helps but need the layout before I do. I have a bad feeling it's not the tubes causing this.

Fret- are you running mono? If so try running out of the other channel and see if it's still doing it.

I don't own either, but if this was considered a conventional amp head, I would look to the preamp tubes in the Triaxis. The one interesting comment was the sound getting tinny and thin. You are losing a gain circuit somewhere. Not knowing how the tube layout is exactly (ie. what tubes control which channels), but V1, the first one will go across all channels. If you can isolate it to specific channels and check your manual, you could isolate which tube it is. If it is on the higher gain channels, where all preamp tubes are driving the gain, it will likely be one or two of the first 3 tubes. Grab you some 12AX7's and change them out.

Steve

 

[TOOLGUY]

I would agree but I am not using a Triaxis on my setup.
I have tried the 2:90 with two preamps and the same results.
I have tried replacing the three 12ax7 (inverter? tubes) with good ones.
From the eurotubes page looks like the a/b 6l6 tubes are "stacked" left and right
(although my 2:90 must be a early 1st run as there are alot of differences between the one on their page and my 2:90).
Maybe I should start my own thread. Just did not want to muck up the forum with duel posts on the same problem.
Thanks

 

[Fret-Shredder]

Interestingly enough my volume drop happens on BOTH channels A & B of the 2:90 when I run them individually. So do you think its the TRIAXIS preamp tubes that is causing the volume drop? My exact problem is I am playing and the volume will drop out a bit and distortion is lessened too and then on its own it will normalize.

 

[ryjan]

I had a tri/290 rig that would drop the gain like you rolled off the guitars volume a bit. It went away when I replaced the 12ax7s in the 290.

 

[Fret-Shredder]

Thank you I think I will try that first

I had a tri/290 rig that would drop the gain like you rolled off the guitars volume a bit. It went away when I replaced the 12ax7s in the 290.

 

[crane]

The same problem occurs with my triaxis one week ago. It's not the power amp cause I've used 2 differents.
Everything went ok when I unplugged the MFX from the loop. I still have to tried if the problem comes from the MFX or from the TA loop.

 

[prsrose]

I had the same exact problem --
I ended up replacing the power amp tubes and I think this solved my problem, BUT... Then I was having problems running stereo. So I replaced my preamp tubes.
I found out I had my effects loop wired wrong. :lol:

But now I'm having a problem with one side sounding better than the other. I dont know. Frustrating!!

My guess would be to check your tubes first.