125 Volt Fuses

[S Phillips]

I picked up an old Sears by Fisher receiver that uses 125 volt 2 amp slo blo fuses for the speaker circuit and 125 volt 3 amp slo blo for the power circuit. The only fuses I can find on mouser and digikey or google search are 250 volt slo blo. Are these ok as a replacement?

 

[NW1]

My understanding is that if a fuse's voltage rating is = to or > than the specification, it is OK but do not deviate from the current (amp) rating.

 

[S Phillips]

That’s what I was thinking as well, just wanted some reinforcement.

Thx, Steve

 

[RossW]

Yes, going up in voltage is fine for fuses.

 

[S Phillips]

Thx Ross

 

[oldflame]

Is the Slo-Blo specified for the speaker or is that's just what's there? Regular fuses are sometimes (often?) used for speaker protection. The time-delay will allow bass content but may not protect some tweeters.

I've used 20 amp fuses or shunted the fuse holder with a soldered wire to maximize the damping factor. Trust your ears: if it doesn't sound distorted the speakers are likely to be safe. I believe that back in the early days of Hi Fi, speakers were less robust.

 

[S Phillips]

Is the Slo-Blo specified for the speaker or is that's just what's there? Regular fuses are sometimes (often?) used for speaker protection. The time-delay will allow bass content but may not protect some tweeters.

I've used 20 amp fuses or shunted the fuse holder with a soldered wire to maximize the damping factor. Trust your ears: if it doesn't sound distorted the speakers are likely to be safe. I believe that back in the early days of Hi Fi, speakers were less robust.

 

[oldflame]

Ignore the decimal point; it's probably a typo and they really want you to install a 20A fuse.

You could use that as a variable-damping feature, sometimes found on old tube amps. Compare different fuse values to determine if there's any change in sound quality.

 

[S Phillips]

Ignore the decimal point; it's probably a typo and they really want you to install a 20A fuse.

You could use that as a variable-damping feature, sometimes found on old tube amps. Compare different fuse values to determine if there's any change in sound quality.