It seems to me that there is always a risk when using an audiophile fast blow fuse in an amplifier, since the "nominal melting point" is unknown (compared to major fuse manufacturers who publish their specs).
With amps that use a slow blow fuse, the very nature of said fuse allows for a brief period of over-current. It seems like less risk to use an audiophile fuse with unknown specs. Provided that the fuse being used has the correct rating specified by the manufacturer.
@audiolabyrinth, IYE, were the SR fuses that blew prematurely fast blow fuses or were there reports of all SR fuses blowing?
With amps that use a slow blow fuse, the very nature of said fuse allows for a brief period of over-current. It seems like less risk to use an audiophile fuse with unknown specs. Provided that the fuse being used has the correct rating specified by the manufacturer.
@audiolabyrinth, IYE, were the SR fuses that blew prematurely fast blow fuses or were there reports of all SR fuses blowing?