Road King 2 Tube Problem?

[paulg2uk]

Hi all

Need some help with my road king 2 think it might be a tube problem but not sure which one it is? I 'm thinking its a preamp tube but not sure. Here's what happened


I had a gig on friday and I had a bit of a problem with the road king. I usually use the the road king with a TC G system that I put through the fx loop and use an RJM amp gizmo to change channels on the amp. I plugged in everything as normal and as we were just about to start playing I noticed on channel 4 I had hardly any gain no matter where I turned the dial and also the volume knob had no effect either. I thought it might be a channel so I change to channel 3 and still the same problem. Effects were coming through but just no gain and the volume seemed to bit fixed at a certain position.


I then decided to unplug the g sys totally from the fx loop and just go straight in the front of the amp to the guitar. This time I had a little control of the volume but not really or hardly any gain and the amp just seem to go into a natural overdriven sound no high gain whatsoever. Even the clean chan 1 seemed not to at its full self.


Probably you guys that are reading this you would say its a tube problem? And thought it would be a preamp tube but I didn't know which one it was and I didn't have any spares which was stupid of me I know. We did have a really great gig but I thought I'd best ask before I go buying and taking out valves what you guys think the problem is?


Many Thanks

Paul

 

[jbird]

F/X Loop Hard Bypass!

 

[paulg2uk]

F/X Loop Hard Bypass!

Ok so what I've done is plugged straight into the front of the amp and bypassed the fx loop completely and the amp's gain seems to have returned to normal. In which case I'm guessing that V5 that controls the fx loop is the culprit.

Anyone agree?

Cheers

Paul

 

[konstantine RK]

Yes replace V5 with another 12AX7 or SPAX7.... just take the powertubes out and loosen the preamp cap then carefully put the spokes in the holes...

or take the amp out of the cab and get the birdseye view and do it!

It has to be V5

 

[prskier17]

Several times while setting up for a gig I've had this issue and it always turned out that the Speaker A, A+B, B switch got knocked during transport. I made a habit of checking over all the controls and switches because there are so many of them! Sounds like your problem is different.... just a tip to a fellow Road King player.

 

[paulg2uk]

Several times while setting up for a gig I've had this issue and it always turned out that the Speaker A, A+B, B switch got knocked during transport. I made a habit of checking over all the controls and switches because there are so many of them! Sounds like your problem is different.... just a tip to a fellow Road King player.

Thanks for the advice guys, It turned out to be the g system the insert loop was turned off by accident not letting anything through to the fx loop. Its never happened before but now i know if it happens again It will be the first thing I check.

Cheers

Paul