[PaulR]

Thanks Bill,

I had actually seen this site, and I got a full set of circuit diagrams with the set. Neither mentions the third pole. I think it must cut off the output from the power supply, possibly to give a quiet switch on and off.

I took the switch to pieces last night ( and finished it off in the process). The outer slider was connected to the circuit breaker slider by a small hook which had broken off so there was never any chance of repairing it. I have seen a couple of possible replacements in CPC and will get them next time I am in Preston. Then we will see about the faulty channel!

Paul