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?
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.