Dual Rectifier Solo gain problem

[protoplasma]

Hello All,

I recently had my first issue with my Dual Recto head. It was playing find and I threw it into standby while we took a break. When I came back to it the amp sounded as if my guitar volume was barely on. The gain is almost non-existent on channel 2&3. Channel 1 'seems' to be ok... The 'pushed' mode works, but I haven't used it much so I couldn't tell you if it sounds like it used to. The first thing I did was swap out all the preamp tubes with a spare set and it had no effect. I swapped the power tubes for the heck of it, and it too didn't have an effect. I'm certain the problem is in the preamp section of at least channel 2&3. I pulled the chassis out of the cabinet to inspect the boards. After poking around I can't locate any obviously smoked components or loose connections.

I'm just thinking out loud, the problem could be with one of the many relays used in channel switching -- perhaps one is stuck on/off. It really could be just about anything.... Anyone seen a similar problem or have any suggestions?


Thanks,
Kyle

 

[clutch71]

I had a bad grid resistor that severly limited the gain in a 2ch the volume was fine though. If it's still under warranty I'd take it in for service. Especially since the preamp swap didn't correct the issue and channel one seems fine. Did you remove the footswitch and try channel changing by hand?

 

[stompboxfreak72]

Take it to be serviced. Happened to me at a gig once. Channels 2 and 3 had no gain or volume and only the clean channel 1 would work. Unfortunately, I had to play a full set of RATM and Tool with nothing more than a tubescreamer on the clean channel. Brutal.....

My Dr had some power issues. I suspect you have the same...

 

[LG]

+1 to Stomp
Get it in the shop.My amp is in the shop at this time for a similar problem. It is no longer under warranty (2002 model DR) and the last I was told was that a "section" of my board was burned out and possibly my tranny. I was setting up a GC Pro and GCX and couldn't get the channels to switch off when I pressed a different one. The volume lowered to almost nothing then went completely. If the tranny is bad my plans are to drop a Mercury in there. Good Luck with yours.