Guys:

I know we have discussed putting a fuse into a restored radio to protect a power transformer against a short circuit or electrolytic failure or to protect against a fire, etc.

Does this also apply to those colorful 1950s AC/DC sets? There is no transformer to protect and since the circuitry is built on a circuit board ( usually ) the likelihood of a short circuit is small.

Opinions?

Lou

:Guys:
:
:I know we have discussed putting a fuse into a restored radio to protect a power transformer against a short circuit or electrolytic failure or to protect against a fire, etc.
:
:Does this also apply to those colorful 1950s AC/DC sets? There is no transformer to protect and since the circuitry is built on a circuit board ( usually ) the likelihood of a short circuit is small.
:
:Opinions?
:
:Lou
:

You actually listen to those things? :>)
I have about a half dozen mid50's circuit board AA5's, but I wouldn't bother fusing them. As I posted on the other thread, a fused power bar would be my choice. I will sometimes have 4 or 5 radios on at the same time, turning one up and the others down, scanning for some intelligent AM content. When I leave the room, I switch off the power bar.

Some of the AA5 radios have a 33 ohm resistor in series with the plate or in series with the cathode of the rectifier. This would be a surge limiter, but the use of a flameproof metal oxide resistor here would also act as a fuse. Excessive current draw would open this weak link.

Thanks Guys

I am restoring these for OTHER people, so the power bar idea is out - but thanks anyway. I think in the set I am working on the 1 W CARBON resistor in the power supply actually burned up in response to a shorted electrolytic.

Lou

:Some of the AA5 radios have a 33 ohm resistor in series with the plate or in series with the cathode of the rectifier. This would be a surge limiter, but the use of a flameproof metal oxide resistor here would also act as a fuse. Excessive current draw would open this weak link.
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