<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000'><span style="background-color: rgb(255, 255, 255);">I'm very aware that I have a limited view on this and am happy to learn.</span><div style="background-color: rgb(255, 255, 255);">So if there are sites that explain what is going on and can verify that the treatment helps, they would be most helpful and interesting.</div><div style="background-color: rgb(255, 255, 255);">And how do we know a failed tube would have been helped by gettering??</div><div style="background-color: rgb(255, 255, 255);"><br></div><div style="background-color: rgb(255, 255, 255);">WL</div><br><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Robert Groh" <rgroh@swbell.net><br><b>To: </b>"George Collins" <gjcollins@cox.net>, Heath@puck.nether.net<br><b>Sent: </b>Monday, August 10, 2015 11:02:55 AM<br><b>Subject: </b>Re: [Heath] Gettering 572B's for a Heathkit SB-200<br><br><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_1_1439218769581_3166" dir="ltr">George, there are ton's of hits on the subject if you do a Google web search for '572B tubes gettering'. Basically I think you arrange to turn the filaments on and then run the tubes for couple of days - no drive, just idle current. At any rate, I suggest you plow though the bunch of links found from your web search.</div><div dir="ltr"><br></div><div dir="ltr">73 and happy QRO</div><div dir="ltr">Bob Groh, WA2CKY<br></div><div><span></span></div> <br><div class="qtdSeparateBR"><br><br></div><div style="display: block;" class="yahoo_quoted"> <div style="font-family: HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font face="Arial" size="2"> On Monday, August 10, 2015 6:01 AM, George Collins <gjcollins@cox.net> wrote:<br> </font> </div> <br><br> <div class="y_msg_container"><div id="yiv4090082378">
<title>Gettering 572B's for a Heathkit SB-200</title>
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<div dir="LTR"><span lang="en-us"></span><span lang="en-us"></span><span lang="en-us"><font face="Arial">Hello Group,</font></span></div>
<div dir="LTR"><span lang="en-us"><font face="Arial">I have a few 572B’s that having been unused for unknown lengths of time, probably several years. It is possible to getter this tubes be for putting them into service in order to avoid arcing or flash over? Are there any other measures that can be taken with the 572B’s to avoid failures at startup? I plan to use these tubes in an SB-200 amp. The amp is working now, but the tubes are weak. The replacements I have are either New Old Stock or “good” used.</font></span></div>
<div dir="LTR"><span lang="en-us"><font face="Arial">Thanks and 73,</font></span></div>
<div dir="LTR"><span lang="en-us"><font face="Arial">George, KC1V</font></span></div>
<div dir="LTR"><span lang="en-us"></span><span lang="en-us"></span><span lang="en-us"></span></div>
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