<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym19_1_1490292212846_4980" dir="ltr">I have a number of kw rated amps, one of which is a Hath SB 221, and when keyed up, with Zero driv, has an idling plate current of 140 ma.. I have looked up the specs for the Eimac 3-500Z but my tubes are Chinese 3-500 ZG tubes. I think 140 ma is about right for two tubes???<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1490292212846_5145"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1490292212846_5252">I am asking about the plate current meter readings of YOUR SB SB221/220 amplifier keyed up with NO RF DRIVE. My 140 ma plate current keyed up with Zero drive sounds about correct but I would like what you are experiencing with your amp keyed up with no drive . Thanks and 73, John, K5PGW<br></div></div></body></html>