<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1481412680846_14065"><span id="yui_3_16_0_ym19_1_1481412680846_14064">With my SB-200, I have found that increasing the loading slightly after achieving maximum output results in only a very small percentage of power reduction but reduces the grid current substantially. Depending on the band, I can get 600-watts out with less than 25 mA total grid current.</span></div><div id="yui_3_16_0_ym19_1_1481412680846_14065"><span><br></span></div><div></div><div id="yui_3_16_0_ym19_1_1481412680846_14067"> </div><div class="signature" id="yui_3_16_0_ym19_1_1481412680846_14096">Glen, K9STH </div><div class="signature" id="yui_3_16_0_ym19_1_1481412680846_14096"><br></div><div class="signature" id="yui_3_16_0_ym19_1_1481412680846_14096">Website: http://k9sth.net</div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1481412680846_14097"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1481412680846_14177" style="display: block;"> <div style="font-family: HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1481412680846_14176"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1481412680846_14175"> <div dir="ltr" id="yui_3_16_0_ym19_1_1481412680846_14178"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1481412680846_14181"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Kenneth G. Gordon <kgordon2006@frontier.com><br></font></div><div class="y_msg_container" id="yui_3_16_0_ym19_1_1481412680846_14174"><br>Sigh....no, as Kevin mentioned, I was thinking "backwards".<br><br>I had forgotten that LESS capacitance at the loading control equals MORE output to the <br>antenna.<br><br>There is nothing wrong with the amp: it is simply operator error.<br><br>I watch grid current very closely and keep it less than 50 mA per tube. Usually I try to keep it <br>about 35 mA per tube, in fact. <br><br>I have always regarded grid current as the most critical parameter one should track in GG <br>amps. That is one reason I have always thought the FL-2100 was weird: there is no way to <br>monitor grid current with that amp in its stock configuration.<br><br>I have also modified the input circuitry to my SB-200 so that it shows no more than 1.5:1 <br>over those portions that I use in all ham bands.<br><br>Power output on 80 meters with new RF Parts 572Bs is 600 watts with about 50 watts of <br>drive power. Plate current is less than 500 mA. All this makes me happy, and the amp <br>seems to be happy too.<br><br>My thanks to Kevin for waking me up.<br><br>Ken W7EKB<br><br>---<br>This email has been checked for viruses by Avast antivirus software.<br><a href="https://www.avast.com/antivirus" target="_blank">https://www.avast.com/antivirus</a><br><br>_______________________________________________<br>Heath mailing list<br><a ymailto="mailto:Heath@puck.nether.net" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a><br><a href="https://puck.nether.net/mailman/listinfo/heath" target="_blank">https://puck.nether.net/mailman/listinfo/heath</a><br><br></div> </div> </div> </div></div></body></html>