Fuse upgrades? -- 6.3 amp 250v 5X20mm fast blow fuses

sleepwalker65
You can choose to believe in unquantifiable properties, while I believe in the works of the esteemed scientists who authoritatively laid the groundwork of all modern electrotechnology: Georg Ohm, Heinrich Hertz, James Watt, Joseph Henry, Alessandro Volta, André-Marie Ampère, Michael Faraday, Charles-Augustine de Coulomb, Nikola Tesla, Gustov Kirchoff, Thomas Edison, John Bardeen, Walter Brattain, William Shockley and many others. Believe what you want to, but please refrain from disparaging others.

Best Name Dropper of the Week goes to....sleepwalker!

Joke. Who invented the steam engine? Watt. Who invented the steam engine? Watt. Who....

Couple of additional thoughts.  You may not hear a difference with fuses.  Your equipment/speakers may not be high enough resolution to hear the differences.  On very warm equipment, just putting in one Hi-Fi Tuning fuse may not may any significant amount of difference (especially if there are 3 other fuses that are working in conjunction).  If you have 4 internal fuses on the DNA, I would suggest upgrading all 4 of them to get an "idea" of what a specific fuse is doing.  I suspect they are all post-transformer or post-regulator fuses (2 for each channel).

@auxinput I agree, any fuse that comes after the power supply filter capacitor(s) has potential to affect current delivery and hence sound quality. For that reason, I prefer fusing only on the power transformer primary side, where it should have zero impact if not sized too conservatively. Also, I prefer fast acting fuses on everything except the power amps, due to the nature of high and very brief instantaneous current demands. As usual, in keeping with safe operation, as long as the manufacturer recommends a slow-blow fuse, that is the only situation when I would use one. 

Gents, thanks again for chiming in on this now-contentious post... could on GK to throw voodoo dust over sound electrical theory.  I am taking auxinput's advice and replace all four rail fuses on my DNA .05 with these ceramic fuses from Bussman, costing $5.00 each. Worth a try.

 

Bussmann 

Miniature Fuses, GDA Series 

Item# GDA-6.300A - FUSE, 6.3A, 250V, F, 5X20mm, CERAMIC 

GDA Series Information

• 5 x 20 Millimeters
• 0.05~6.3 Amps
• 250VAC
• Fast Acting
• UL Approvals

The Bussmann GDA Series are a group of low voltage, general purpose miniature fuses. These fuses are designed for use in appliances and consumer electronic equipment.

• High Breaking Capacity
• Optional Axial Leads
• Ceramic Tube
• Nickel-Plated Brass Endcaps