>Good day to everyone on the Amps list.
>
>As the subject line indicates, I am having some problems with my Heathkit
>SB220 amp. It currently is very intermittent in providing power out on 10,
>15 & 20 meters. It frequently fails on 40 meters as well, but 80 meters is
>working properly.
>
>The amp loads up in it normal plate and loading positions for my
>antennas, but then completely drops out, in terms of no power being
>displayed on a Bird 43 watt meter. Although the power drops out, there is
>no change in the grid meter or plate meter reading when the power drop
>out... at least not to a noticeable degree. The amp stays in this
>condition on that band, but often recovers on a band change, especially to
>80 meters. After several attempts on band changes, it will provide power
>out and then, in the middle of a transmission, drop out again.
>
>The accompanying drop out in power is sometimes preceded by some arching
>type sound in the amp. I have not been able to see where in the amp this
>is taking place, but the occasional time, it does appear to be in the area
>of the top of the tubs or perhaps to the side of the tub area. It is very
>difficult to tell as the amp is elevated on a shelf above my line of
>sight_______________________________________________
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