Many high powered solid state amps of yesteryear, eg Crown DC300, had no speaker protection relay against high DC voltages eg in case of a transistor failure. Just had my 1981 4B recapped by Bryston in Peterbough 3-4 years ago, but the thought didn’t occur at the time.
I have vintage Altec A-7’s and replacement horn diaphragms and woofer recones are expensive; been there (the fault of a Marantz 2270).
Reading up on the subject I see kits and assembled modules available with their own power supply, but others talk about wiring into the amp’s own power supply.
Relays must be capable of high current in these amps or the contacts could fuse.
I’ve read about fast-blow fuses but are they a guarantee against DC that might fry a coil but not blow the fuse?
Any one know of a reliable ready-made solution, please chime in. I can solder ( recapped my own vintage tube amp and receivers), oriented with tube schematics, but never delved into this here modern “solid state”.
Thanks
Jon Archibald
Peterborough Ontario