Why on Earth would you put fuses anywhere except on the primary of the transformer? The only reason I can imagine is to idiot-proof things because you're customers require idiot-proofing.
Fuse upgrades? -- 6.3 amp 250v 5X20mm fast blow fuses
I occasional blow a one of these 4 fuses in my McCormack DNA .05 and use cheap fuse replacements costing maybe $.50 a piece. Can anyone recommend upgrades fuses that might enhance the performance of the amp, but not costing in the SR price range. Say $1-$5 a piece? Thanks for any insights.