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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Glen, <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Your article on the 6146 family is very informative and helpful. However, it begs the question….what to do with all those 6146B/8298A’s? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Your article stated that Collins “figured it out” for the later S line transmitters (amazing what necessity fosters).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I wonder if anyone has compared the Collins neutralization circuitry for the early transmitters to the latter ones? Could the later S-line approach (whatever it is) work with other 2X 6146 rigs so that they would be “happy” with the B’s? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Are there any other known 2X 6146 rigs that can run B’s without problems?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Glen…anyone?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>73,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Chris<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>W7JPG<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Heath [mailto:heath-bounces@puck.nether.net] <b>On Behalf Of </b>Glen Zook<br><b>Sent:</b> Saturday, October 12, 2013 9:26 AM<br><b>To:</b> RAY FRIESS; Gary H. Harmon, Jr.; heath@puck.nether.net; Heathkit2; Heathkit3 LIST<br><b>Subject:</b> Re: [Heath] [Heathkit] 6146B Issues<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>The DX-35, DX-40, and the DX-60 series "load down" the grid circuit. This, in turn, requires considerably higher output from the driver stage. As such, Heath did not neutralize those transmitters. With the "loaded down" grid, the 6146 in the final amplifier is much less likely to "take off" and neutralization is not usually required. In most cases, the 6146B/8298A or 6146W tubes will work fine.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>Of course, there are always exceptions. As such, I will not say that the later tubes will work in every DX-35, DX-40, and DX-60 series. However, there is a very good chance that the tubes will work fine.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Glen, K9STH<o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Website: <a href="http://k9sth.com">http://k9sth.com</a><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><div><div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>On Saturday, October 12, 2013 10:48 AM, RAY FRIESS <<a href="mailto:rayfrijr@msn.com">rayfrijr@msn.com</a>> wrote:</span><span style='font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p></div><div><div id=yiv5734027096><div id=yiv5734027096yqtfd68761><div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Calibri","sans-serif";color:black'>Glen ... question.<br>Does this apply as well to the simple Heathkits like the DX 40 and DX 60? I don't recall off hand that those simple ones require or even have provision for neutralizing.<br><br>Ray wa7itz</span><span style='font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p><div><div class=MsoNormal align=center style='text-align:center;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><hr size=2 width="100%" align=center id=yiv5734027096stopSpelling></span></div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Date: Fri, 11 Oct 2013 18:46:40 -0700<br>From: <a href="mailto:gzook@yahoo.com">gzook@yahoo.com</a><br>To: <a href="mailto:gharmon@idworld.net">gharmon@idworld.net</a>; <a href="mailto:heath@puck.nether.net">heath@puck.nether.net</a>; <a href="mailto:heathkit@mailman.qth.net">heathkit@mailman.qth.net</a>; <a href="mailto:heathkit@yahoogroups.com">heathkit@yahoogroups.com</a><br>Subject: Re: [Heath] [Heathkit] 6146B Issues<o:p></o:p></span></p><div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>There is no list. However, the 6146B/8298A and the 6146W tubes require different neutralization and most of the Heath SB-Line equipment are very "iffy" in whether or not they can neutralize. Some units seem to work OK but even more have problems. One can modify the neutralization circuit so that the transmitters / transceivers will neutralize. However, for "plug and play", one really needs to use the 6146, 6146A/8298, or 6293 tubes, especially if they have problems neutralizing the tubes.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>There are those who violently disagree with my article on the 6146 family of tubes:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><a href="http://k9sth.com/uploads/The_6146_Family_of_Tubes_1.pdf">http://k9sth.com/uploads/The_6146_Family_of_Tubes_1.pdf</a><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>However, over the years, I have literally seen well over 10,000 transmitters that use the various 6146 family of tubes and my observations are outlined in the article.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>There are those who say that they have used the 6146B/8298A or 6146W in transmitters that were designed for the 6146 or 6146A/8298 without any problems. I do believe them. However, I have received notice from a LOT more people who say that they have had problems and went back to the earlier tubes. It seems to be how the individual tolerances of the components "add up" as to whether or not the later tubes work.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Helvetica","sans-serif";color:black'>I have worked on individual transmitters, of exactly the same model, with serial numbers within 10 of each other. With those transmitters 1 was happy with the 6146B/8298A and the other 2 were very unhappy.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Glen, K9STH<o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>Website: <a href="http://k9sth.com">http://k9sth.com</a><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><div><div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>On Friday, October 11, 2013 5:13 PM, "Gary H. Harmon, Jr." <<a href="mailto:gharmon@idworld.net">gharmon@idworld.net</a>> wrote:</span><span style='font-family:"Helvetica","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'>I seem to remember there are some pieces of Heathkit that are not<br>HAPPY-HAPPY-HAPPY with 6146B tubes. Is this a myth or is there a list of<br>pieces that prefer to not see a 6146B?<br><br><br><br>Thanks and 73, <br><br><br><br>Gary H. Harmon, Jr. - K5JWK<br><br>6003 Archwood<br><br>San Antonio, TX 78239-1504<br><br>210.657.1549h / 210.884.6926c/t<br><br><br><br>"Retirement means every day is a Saturday except Sunday"<br><br><a href="http://www.grissomroadcoc.org/" target="_blank">http://www.grissomroadcoc.org</a><br><br><br><br><br><br>______________________________________________________________<br>Heathkit mailing list<br>Home: <a href="http://mailman.qth.net/mailman/listinfo/heathkit" target="_blank">http://mailman.qth.net/mailman/listinfo/heathkit</a><br>Help: <a href="http://mailman.qth.net/mmfaq.htm" target="_blank">http://mailman.qth.net/mmfaq.htm</a><br>Post: mailto:<a href="mailto:Heathkit@mailman.qth.net" target="_blank">Heathkit@mailman.qth.net</a><br><br>List Administrator: Duane Fischer, W8DBF<br>** For Assistance: dfischer at usol.com **<br><br><br>This list hosted by: <a href="http://www.qsl.net/" target="_blank">http://www.qsl.net</a><br>Please help support this email list: <a href="http://www.qsl.net/donate.html" target="_blank">http://www.qsl.net/donate.html</a><br><br><o:p></o:p></span></p></div></div></div></div></div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><br>_______________________________________________ Heath mailing list <a href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a> <a href="https://puck.nether.net/mailman/listinfo/heath">https://puck.nether.net/mailman/listinfo/heath</a><o:p></o:p></span></p></div></div></div></div></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div></div></div></div></div></div></body></html>