Here's a strange problem. I have an old Laney AOR-30R tube amp. Actually it's the first guitar amp I ever bought back in the 80s. At some point the reverb stopped working, so I checked the reverb tank's coils for continuity with an ohm meter. Suddenly it worked again - but only for 5-10 minutes or so. Whenever I touch the output plug of the reverb tank, I get reverb for a while and then it dies again.
And so it has remained for the past 20 years. But now I finally want to solve the problem. So what could it be? Here's the reverb section of original schematic - sorry it's a bit fuzzy:
This is a later version of the same amp, some values have changed and the opamps are now TL 071/72 instead of LF 351/353. But otherwise very similar and a sharper image:
The PCB is a real bitch to work on as the leads to the pots and tubes are very short. So I don't feel like experimenting too much. :?
Any ideas?
And so it has remained for the past 20 years. But now I finally want to solve the problem. So what could it be? Here's the reverb section of original schematic - sorry it's a bit fuzzy:
This is a later version of the same amp, some values have changed and the opamps are now TL 071/72 instead of LF 351/353. But otherwise very similar and a sharper image:
The PCB is a real bitch to work on as the leads to the pots and tubes are very short. So I don't feel like experimenting too much. :?
Any ideas?