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Resistors in series with rectifier

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Diver300

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I've just fixed an amplifer/tuner. The transformer has a main and an auxiliary output. The auxiliary output has 1 ohm resistors on the AC side of the rectifier.

The resistors were 1/4W film ones, and had failed. There was no burning to indicate failure, and one had gone open circuit, and the other read around 200k ohms.

What are the resistors for? I had never seen resistors like that before. They seem to be rated at too low a power rating, so I replaced them with larger ones.
 

Nigel Goodwin

Super Moderator
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A mixture of surge limiters and fuses, so you shouldn't really replace them with larger ones, and the originals might even be special fusible resistors.
 

unclejed613

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Most Helpful Member
if the originals were flameproof types (which from experience i would expect them to be) they should be replaced with flameproof types. it's very likely something else is wrong at or after the rectifier if they're blown. a shorted regulator or rectifier are likely.
 

colin55

Well-Known Member
The resistors have gradually "burnt out."
They are "fuses" or "safety resistors" or "fusible resistors."
Replace them with the same type.
 
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