Hello, I have two blown 250V 4A fuses inside my Adcom GFA-545 power amp. Can you recommend a replacement source to maintain the high quality of this amp?
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  1. I don't think the quality of the fuse will have any effect on the power amp's performance so long as the voltage and rating are the same.

    Unless you already know the reason, I would be more concerned about why two fuses have blown. Obviously, replacing them will not sort out the cause.
  2. As far as the fuses are concerned, there's three things you need to be concerned with: voltage, current (as fihart said), and whether they are fast or slo-blow fuses.

    If specs call for slo-blow fuses, fast-blo of the proper ratings will pop every time, even in a properly operating amplifier.
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