ARC doesn't use fuses. Cary and CJ and most others do. The thought would be that a fuse in the circuit path isn't good sonically. There is current going through the fuse up to the fuses limit or rating. I've never been able to compare the two. I have mixed feelings.
But regardless I think it's not reasonable to expect a customer to repair an amp by replacing a resistor if a tube fails, and that's in essence what we are talking about.
PrimaLuna has a trick way of doing it. The Adaptive AutoBias circuit senses when a tube fails and opens a very high quality Fujitsu relay in the circuit path protecting the amp from the failure. Once the amp is turned off and the tube is replaced you simply turn the amp back on.
It addresses the issue of repairs and fuses as well as sonics.
But regardless I think it's not reasonable to expect a customer to repair an amp by replacing a resistor if a tube fails, and that's in essence what we are talking about.
PrimaLuna has a trick way of doing it. The Adaptive AutoBias circuit senses when a tube fails and opens a very high quality Fujitsu relay in the circuit path protecting the amp from the failure. Once the amp is turned off and the tube is replaced you simply turn the amp back on.
It addresses the issue of repairs and fuses as well as sonics.