[Amps] SB220 - no power output problem

[rlm]

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 at imagewireless.ca>
>> Date: Wed Oct 1, 2003  6:24:45  AM US/Pacific
>> To: rlm <r at 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 at vc.net to r at somis.org
> 2 at vc.net is history on 1 October.
>
>
>
Rich Measures, AG6K, 805.386.3734.  www.somis.org/  E-mail adr is 
changing from 2 at vc.net to r at somis.org
2 at vc.net is history on 1 October.