fuses on amp power rails

Of course I meant that the DC rail fuses possibly cause damage as only one of them blows. The opposite of protecting anything. Witnessed this with amplifiers with DC fuses but no loudspeaker protection. This does likely not happen when having them at the AC primary side. Then both rails power off the more friendly way which saves at least 1 woofer. Worst case at some time one of the rails discharging in the woofer but at least it survives that contrary to one rail full voltage because a DC fuse blew.

Very aware of the necessity of fuses for a certain reason but used to slightly higher values 😉 Just not too many in my amplifiers and also no active current limiting. See post #117.
 
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I would say you have to combine fuse with some kind of DC offset protection to minimize the collateral damage. I have seen some non-working amps only because of blown fuse. That might be caused by short at output by accident. There is still value to add the fuses on the rails.
 
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Repaired UK cottage industry and audiophile stuff in the nineties. These had DC fuses but no loudspeaker protection circuits. Also in audiophile circles loudspeaker protection was not in fashion. Burned woofers then were common after amplifier failure.
 
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Yes, absolutely!

My favorite was a fuse in the speaker lead. Relays were "bad", so we'll use a fuse. That demonstrates a clear understanding of how things work, and how well a reviewer hears. Welcome to the high end audio freak show.