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In Reply to: RE: Fisher SA-16 With Burned Resistors posted by Michael Samra on September 23, 2016 at 00:03:54
I've seen this when someone substitutes the wrong fuse. Like using a 20-amp car fuse one in place of a 3-amp slow-blow.
Excessive initial current draw fries the artificial CT tap resistors.
Follow Ups:
Steve
I've often wondered at times if the fuse acts as an inrush current limiter.If you watch a fuse that is exposed that sits in the fuse clips,many times on startup you can see a movement inside the fuse wire or it gets slightly brighter and then settles back down.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 09/23/16
Why tube amps often use slow-blo fuses. Fast blows, at same current rating... pop. Esp, cold startups.I've worked on or read around a dozen amps with fired heater lines and/or pilot lights that keep popping. You check the fuse holder and someone had replaced the OEM one with a 20-amp car fuse. Or worse, a straight wire.
Edits: 09/23/16 09/23/16
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