<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_1461009509837_4274"><span id="yui_3_16_0_ym19_1_1461009509837_4361">I have both an AR-2 and an AR-3. On the AR-2 it takes 2.5 turns on the main tuning knob to go from end to end on the dial and on the AR-3 it takes 3 turns on the main tuning knob to go from end to end on the dial.</span></div><div id="yui_3_16_0_ym19_1_1461009509837_4274"><span><br></span></div><div id="yui_3_16_0_ym19_1_1461009509837_4274"><span><br></span></div><div id="yui_3_16_0_ym19_1_1461009509837_4274"><span>As for the "hum" when in the CW position:</span></div><div id="yui_3_16_0_ym19_1_1461009509837_4274"><span><br></span></div><div id="yui_3_16_0_ym19_1_1461009509837_4274"><span><br></span></div><div id="yui_3_16_0_ym19_1_1461009509837_4274"><span>Check the 12AV6 and the wiring around it. Also, replace the 20 mfd capacitor from Pin-8 of the 12V6 to ground.</span></div><div id="yui_3_16_0_ym19_1_1461009509837_4274"><span><br></span></div><div id="yui_3_16_0_ym19_1_1461009509837_4274"><span><br></span></div><div></div><div id="yui_3_16_0_ym19_1_1461009509837_4275"> </div><div class="signature" id="yui_3_16_0_ym19_1_1461009509837_4726">Glen, K9STH
Website: http://k9sth.net</div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1461009509837_4725"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1461009509837_4721" 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_1461009509837_4720"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1461009509837_4719"> <div dir="ltr" id="yui_3_16_0_ym19_1_1461009509837_4722"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1461009509837_4724"> <hr size="1" id="yui_3_16_0_ym19_1_1461009509837_4723"> <b><span style="font-weight:bold;">From:</span></b> Kenneth G. Gordon <kgordon2006@frontier.com><br> <b><span style="font-weight: bold;">To:</span></b> Heath@puck.nether.net <br> <b><span style="font-weight: bold;">Sent:</span></b> Monday, April 18, 2016 11:36 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> [Heath] AR-3 - another question<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1461009509837_4718"><br>From the wording in the assembly manual, it would appear that the <br>main-tuning capacitor has built-in planetary reduction gearing, yet none of the <br>three receivers I have here exhibit that "feature". Tuning of the main-tuning <br>dial is direct and very fast.<br><br>In the past, I have seen such capacitors in which the reduction gearing was <br>"frozen", and by judicious application of some proper lubrication, this could be <br>"reactivated".<br><br>So, did the AR-3's main tuning capacitor in fact originally include planetary <br>reduction gearing?<br><br></div> </div> </div> </div></div></body></html>