Bart-- I would start by checking the bandswitch L contacts for
continuity on the problematic bands.
On Wednesday, October 1, 2003, at 08:22 AM, 2 wrote:
Begin forwarded message:
From: "Bart Ritchie (VE5CPU)" <ve5cpu@imagewireless.ca>
Date: Wed Oct 1, 2003 6:24:45 AM US/Pacific
To: rlm <r@somis.org>
Subject: Re: [Amps] SB220 - no power output problem
Good day Richard
Your reply to may inquiry on the Amps reflector did not contain
anything but some of the original quoted message.
Regards
Bart, VE5COP
At 04:25 AM 10-01-2003, you wrote:
>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
Rich Measures, AG6K, 805.386.3734. www.somis.org/ E-mail adr is
changing from 2@vc.net to r@somis.org
2@vc.net is history on 1 October.
Rich Measures, AG6K, 805.386.3734. www.somis.org/ E-mail adr is
changing from 2@vc.net to r@somis.org
2@vc.net is history on 1 October.
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