But he does not supply an upgraded fuse with his amps. I can not find a post where he states which fuse to the ears of his customers sounds the best.We found a long time ago that people are going to try different stuff and will discard the supplied parts (tubes, power cords, connectors, fuses...). We do audition capacitors and resistors (we were the first to use Caddock resistors, back in 1978) and that continues to this day. Those parts are options in our lessor expensive products and standard in our more expensive units. This has the benefit of reducing the instances of people making a rat's nest of the interior of the product as we can do a much better job of installation in most cases, and we already know what parts work the best. We have some real craftsmen on staff- take a look at the video on our home page and you will see what I mean- all of our gear is signed!
The amplifier builders I have talked with are not interested in evaluating fuses , power cords, expensive capacitors such as Dueland, or any tubes (except run of the mill Chinese or Russian). They leave those decisions to the minority who are really looking to maximize their systems.
We know how our amps sound and what is possible, but on a more practical level there is no point in spending a lot of money on something that is going to get thrown away! That is one reason we have IEC connections on our gear- in that way people won't hack the chassis up trying to replace a power cord.
We do have higher end fuses on our MA-2 amplifier- about 27 years ago we were experimenting with fuses and the ones in the MA-2 beat all the others hands down. 27 years later that is still the case. Those fuses use a much larger fuseholders with much greater contact area and contact force.