I agree with Barry, although my PBT control just had to be moved less to
correct it on my 6+.
My drift was due to a "whoops" though. I reversed the polarity on the power
leads inadvertantly on the 6+ a few years back. The wife said it smelled
"hot" almost immediately. A "hot electronics" smell persisted for quite
awhile. Tentec said it shouldn't have damaged anything due to a
diode/relay protection on the power. I found the source of the smell about
6 months ago. The crystal oven, which is wired directly, had a hole burnt
in it, where you can't normally see it of course. The crystal oven has +
and - connections on it, so it must be polarity sensitive. I still haven't
got around to replacing it.
Jay
At 10:08 AM 11/1/00 EST, Barry N1EU wrote:
>
>I had similar symptoms that seemed to be that the center point of the
>passband had shifted as my Omni VI got warm. All I had to do was adjust
>the PBT to recenter it over the actual passband. I think it sometimes ended
>up at 2 oclock or so. Adding an external fan blowing across the heat sink
>on the rear helped.
>
>GL/73,
>Barry N1EU
>
>
>>
>>2. The PBT has developed a strange, eery-sounding, hollow-sounding 'roar.'
>>Signals are still coming through, but the sound through the filter section
>>is really bizarre. My other Omni VI sounds just fine with no 'roar' like
>>this.
>>
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