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I suppose the button diode you refer to is MR750.
This is for reverse polarity protection.
The idea is that the diode D3 is supposed to conduct the large current if you connect DC backwards. This is only a 6A diode, but for the short time it takes to blow fuses, the fuses should blow up first. If the diode blows first, then the whole amp goes up in smoke.

If you want to put higher current fuses in there, then you should upgrade the D3 diode also if you still want reverse polarity safety. Or you could parallel more big diodes onto D3 if you have them as a cheap insurance policy.

[QUOTE="dudmuck, post: 202135, member: 3904"] I suppose the button diode you refer to is MR750. This is for reverse polarity protection. The idea is that the diode D3 is supposed to conduct the large current if you connect DC backwards. This is only a 6A diode, but for the short time it takes to blow fuses, the fuses should blow up first. If the diode blows first, then the whole amp goes up in smoke. If you want to put higher current fuses in there, then you should upgrade the D3 diode also if you still want reverse polarity safety. Or you could parallel more big diodes onto D3 if you have them as a cheap insurance policy. [/QUOTE]

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