DRRI reverb is in and out.

[rockman627]

Reverb works for maybe up to 10 minutes then stops. Pan ,cable and v3 -v4 check ok. So I got to open her up. What can I be checking for?
Fender-65-Deluxe-Reverb-Schematic.pdf

[The Dude]

The fact that it works until it warms up makes me think tube. You said you checked V3 and V4. How did you check them? Substitution, tube tester, etc. A tube tester may not show the fault. Substitution is best.

[rockman627]

Tube substitution was used. I'm sorry, sometimes I'm working on one amp, then an emergency fix comes up and it's a while til I get back. It was working when I got back to it. I think taking the tubes out and in cleaned the sockets.

[Tom Phillips]

This is a situation that will benefit from the old isolate the problem procedure.
First on the list is to determine if the issue is with the Reverb send or return circuit.
Some ideas to try when the reverb stops working:
* Plug a speaker into the reverb send RCA jack. You will hear the signal thru the speaker if the send is working.
* Touch the hot connection of the reverb return. You will hear a sound similar to touching am open ended guitar cord plugged into an amp if the return is working.

Once you determine if send or return is the issue, you have narrowed down where to look further.