Cambridge Audio A500 Amplifier problems!

[Old Sparky]

Thanks to both of you for your advice, and, Mark, for the circuit diagram. I shall certainly make some further checks, especially of those o/p transistors, before advising the owner further about a possible repair. As previously noted, none of the internal fuses have failed, so the cause of the TX failure is, for the moment, puzzling. I believe there are devices that, possibly with modifications, can replace the SAP15n & 15P Darlingtons, so will check on that. BTW, Mark, R267 is 47K, not 47 ohms( a 'typo' no doubt!)