I'm testing an amp, and it puts out 1.5kW+ 160-10M, but the power drifts, on 160 and 80. Searched the archives for fixes, and (from 9 years ago) found posts indicating that the padders in the loading
Hi David: I had a similar problems with my Viewstar PT-3000A amplifier (has 8877 in final) and the loading would drift on 160 meters as the value of the ceramic padder(in loading circuit) used on tha
ORIGINAL MESSAGE: REPLY: A lot of manufacturers use N750 or similar caps and they do drift. If the drift isn't excessive, I'd ignore it. Does the power output actually change or are you seeing just t
Be careful with any mica cap as the older ones are prone to leakage. I wouldnt use any without a leakage test of least at 500-600V. The 12KV teflon disc caps are in wide use these days and seem quite
If you are near the current limit on the ceramic caps, use multiple smaller value caps in parallel so the current is less in each. 73 Gary K4FMX _______________________________________________ Amps m
Tks to all who have replied. I found some caps on ebay which appear suitable: http://cgi.ebay.com/470-pF-16-KV-Doorknob-Capacitors-Brand-New-Lot-of-5_W0QQitemZ200411424661QQcmdZViewItemQQptZLH_Defaul
ORIGINAL MESSAGE: REPLY: Those look like what I used in my homebrew 8877 amp. They do drift some when used as load padders, but not enough to bother me. On 160 meters (worst case band) when properly
Where do you find those caps Carl? Thanks 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Hi Jim, For the load side you might also consider some of the modern ceramic parts made by ATC, Temex or Murata. The lower value parts are rated up to around 3KV and their current capabilties are imp