Yeah, that's what I am doing... We quickly metered the remaining
four... They are good, but two had drifted out of the 5% range a small
amount and two were still in range... Each one is dissipating ~20
watts which should not age a 100 watt too terribly... They are mounted
vertically on bent finger stock, so air can flow up the center of the
tube as well as around the surface... I do not see any glaring faults
in the construction... Certainly, if a winding has a nicked/kinked
wire it will spot heat and fail over time.. If the wire has
inhomogeneity inclusions these spots will also heat... Could be a lot
of reasons for a spot failure...
Been watching the 3-phase discussion... Long ago and far away I was
the companys 'expert' on 3 phase 15,000 volt substations and 480V
distribution system, power factor correction, yadda, yadda...
Sometimes I miss those days... O'course, I also miss having hair, and
girls giving me that look, etc... Life was good then...
denny / k8do
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### Just replace all 5 of em... I doubt you will have any more
problems. It would be very interesting to see what value of
resistance... the 4 x remaining old ones are ??? If they
drifted... the highest value one would be the hottest. They
were/are running blazing hot as is. A 100 w rated wire wound..
diss 60 w is HOT.
Later... Jim VE7RF
