richopp-
Interesting.
We repair and upgrade both ARC and Mc based on 40+ years of experience. Since Mc has gone to hybrids and multilayer circuit boards, they have become less reliable and much more difficult to repair. For example, in recent integrateds and amps using the VT 120-150 series valves, if the valve fails it can often put a pulse through the driver that is 5x more voltage than it can handle causing it to fail. It can get worse with multi-layer boards. Hence a costly repair replacing the driver and adding a protection diode if the customer wishes. Sometimes the board traces melt in addition. Then the real fun starts....
MC could but do not protect the SS drivers with a $0.05 diode per valve- simple, no? - bad engineering design leaving out this textbook protection.
Just my $0.05.
Interesting.
We repair and upgrade both ARC and Mc based on 40+ years of experience. Since Mc has gone to hybrids and multilayer circuit boards, they have become less reliable and much more difficult to repair. For example, in recent integrateds and amps using the VT 120-150 series valves, if the valve fails it can often put a pulse through the driver that is 5x more voltage than it can handle causing it to fail. It can get worse with multi-layer boards. Hence a costly repair replacing the driver and adding a protection diode if the customer wishes. Sometimes the board traces melt in addition. Then the real fun starts....
MC could but do not protect the SS drivers with a $0.05 diode per valve- simple, no? - bad engineering design leaving out this textbook protection.
Just my $0.05.