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Reverb not working help!

ken374

Member
Messages
7,004
My new 68 Custom twin is not working, I took it home sat when I switched it on didn't really hear it working, just a slight hum just like when you plug a guitar in the amp and the guitar is isn't plugged in. I checked the tubes I believe its a 12at7 in the V3? and there's a at7 at V6 which is the PI I think? Rest are 12ax7. The tank is plugged in the right way also. If I cant figure it im going to take in Thursday the store owner said they should be able to check it out that day. Any ideas?
 

Silent Sound

Member
Messages
5,520
It could be any number of things. Bad tube (there are two that deal with reverb on that amp), bad reverb pan, bad RCA cable, bad resistor or capacitor in the reverb circuit... The only way to know for sure is to start narrowing down the possibilities by swapping out one component at a time with known good ones.
 

mudster

High Prairie Wrangler
Gold Supporting Member
Messages
3,574
Make sure of two things
1) Footswitch is plugged in correctly to the right place
2) The cable that runs from the reverb pan back to the amp could be switched with the run running from the amp into the pan. This happens more often than one might think. The send/return should be labled - make sure they are right.
It it is not that, it is likely the 12at7 tube
 

ken374

Member
Messages
7,004
The store said thursday they should be able to look at it, they have a Tech on board thank god
 

bcmatt

Member
Messages
139
You can look inside the pan too. A lot of times, if something gets disconnected, it is obvious and you can see it. It is a very simple device.
 

ken374

Member
Messages
7,004
pull the reverb out of the bag and the springs were not connected now i have to figure how to connect them got pics?
 

Silent Sound

Member
Messages
5,520
I think they just clip on. But it's been a while since I've looked at a reverb tank. In any case, it's likely you've found the problem, or at least A problem. A new pan should be under $30 shipped, so even if the springs won't clip back on and the dealer won't fix it or refund your money (i.e. worse case scenario), you can replace that part cheaply enough and do the install yourself. No need to pay for a tech unless there's another problem as well. Also, as noted, it's really easy to hook up those RCA wires running to the reverb tank in reverse, so when you fix it and hook it all back up, if you still don't get any reverb, swap those cables around and try again.
 

ken374

Member
Messages
7,004
Cant the springs to clip on so im going take it in, its a new amp so it shouldnt cost me thanks for the help
 






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