The Sound House,
Torquay TQ1 1QB
I will have a look at it for you.
For general interest, I have seen this sort of problem two or three times before….. (weak output, very low level) and it was mystifying at the time, but was traced back to BBC installations where there were microphone inputs on jackfields…. with 48V phantom power! An accidental insertion of a jack plug could put phantom power up an output, sometimes with disastrous results.
The moral is, keep phantom power away from everything else! 😯