From w7ksg at q.com Sat Jul 2 17:40:08 2016 From: w7ksg at q.com (w7ksg) Date: Sat, 02 Jul 2016 15:40:08 -0600 Subject: [Hallicrafters] WTB: SX 110 type knobs Message-ID: Looking for some SX 110 type knobs . What do you have available ? Cash awaits? JAC? Sent from my T-Mobile 4G LTE Device From mark.k3msb at gmail.com Sat Jul 16 10:37:32 2016 From: mark.k3msb at gmail.com (Mark K3MSB) Date: Sat, 16 Jul 2016 10:37:32 -0400 Subject: [Hallicrafters] FS: Hallicrafters SR-46 6M XCVR and HA-26 VFO Message-ID: For sale is a Hallicrafters SR-46 6M Transceiver and the associated HA-26 2/6M VFO. The transmitter puts out about 3 watts and the audio is OK as received on my IC-756. Turning the VFO causes power to drop off as expected; retune the transmitter and it goes back up to 3W. There is an Intermittent in the mic cord. No receive except static. Playing musical tubes made receive a bit better, and gently tapping some of the tubes in the receive path (that I don't have substitutes for) produced noise spikes. Sold as is. Sale includes only the SR-46, HA-26, Mobile mounting bracket, and hand microphone. $85 + shipping. Photos available upon request. From jeff at podengo.com Sun Jul 31 15:05:32 2016 From: jeff at podengo.com (Jeff) Date: Sun, 31 Jul 2016 15:05:32 -0400 Subject: [Hallicrafters] SX-117 disaster Message-ID: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> Looking for some advice or consolation... Previously well working SX-117/HT-44 twins. I hadn't run them in a long time, and many cables got messed with in the mean time. Unfortunately, in my haste to hook the pair back up again, I got the transmitter output fed into the receiver antenna input... and then hit transmit to tune up the transmitter... It's taken me a while to stop cursing about it, but now my SX-117 is deaf as a post. A quick check of the RF amp and 1st mixer show that the tubes are OK. A signal generator on 14.250 is barely audible, but I can no longer get a good strong peak on the preselector. I can get a bit more of a peak on 40 meters, but it's still quite deaf. I had the rigs in 20 meters when the mishap occurred. It's just about acting like there's no antenna at all hooked to it. I get no increase in noise whether or not it's hooked to the antenna or dummy load. I've had the courage to admit I've done something heroically stupid -- so I'm reaching out to the list for any thoughts or guidance as to how to fix this. Jeff From 1oldlens1 at ix.netcom.com Sun Jul 31 15:31:09 2016 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Sun, 31 Jul 2016 12:31:09 -0700 Subject: [Hallicrafters] SX-117 disaster In-Reply-To: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> References: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> Message-ID: <5e5e86c1-b64d-2573-8193-0e8a54ff0595@ix.netcom.com> I am not sure if there is a problem with both RX and TX. You probably burned out the antenna coil on the receiver, maybe just the primary. A physical inspection is necessary. If its burned it can be rewound or replaced if you can find a new one. The former may be damaged. If so it must be replaced. Check the band switch and anything else close to the input. This is not as rare as you might think, sometimes happens if a changeover relay fails. Your idea about acting like there is no antenna is a clue, check the wiring from antenna input connector to where ever it goes. I am not that familiar with this receiver but its quite possible some lead or a contact on the antenna section of the bandswitch took the brunt of the damage. The transmitter should be checked into a good dummy load. Tuning into what amounts to an open circuit could have caused problems including damaging the tubes. A normal tuneup into a dummy load should tell you how much has happened, if anything. A very long time ago Al Capp, who invented Li'l Abner, also invented the Shmoo, which would become whatever you wanted. We could get inflatable plastic shmoos with weighted bottoms. Perfect for kicking or punching. Don't know if they are still available. Otherwise go to the gym and spend an hour on the heavy bag. It will help. On 7/31/2016 12:05 PM, Jeff wrote: > Looking for some advice or consolation... > > Previously well working SX-117/HT-44 twins. I hadn't run them in a long > time, and many cables got messed with in the mean time. Unfortunately, > in my haste to hook the pair back up again, I got the transmitter output > fed into the receiver antenna input... and then hit transmit to tune up > the transmitter... > > It's taken me a while to stop cursing about it, but now my SX-117 is > deaf as a post. A quick check of the RF amp and 1st mixer show that the > tubes are OK. A signal generator on 14.250 is barely audible, but I can > no longer get a good strong peak on the preselector. I can get a bit > more of a peak on 40 meters, but it's still quite deaf. I had the rigs > in 20 meters when the mishap occurred. > > It's just about acting like there's no antenna at all hooked to it. I > get no increase in noise whether or not it's hooked to the antenna or > dummy load. > > > I've had the courage to admit I've done something heroically stupid -- > so I'm reaching out to the list for any thoughts or guidance as to how > to fix this. > > > Jeff > > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Richard Knoppow 1oldlens1 at ix.netcom.com WB6KBL From cwopr at embarqmail.com Sun Jul 31 15:40:25 2016 From: cwopr at embarqmail.com (Bill Stewart) Date: Sun, 31 Jul 2016 15:40:25 -0400 (EDT) Subject: [Hallicrafters] SX-117 disaster In-Reply-To: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> Message-ID: <506611777.4961665.1469994025836.JavaMail.root@embarqmail.com> Jeff, I'm sure some of us have done the same thing. Hopefully, your damage will be minimum. I am by far, no expert at this but just looking at the input circuit I see several coils. (Check or swap the rf tube...just something easy to ck.) You might start at the rf amp and work back toward the ant connection....esp. the one that had rf from the tx, and look for charred areas on the coils and other parts. J2 has the most 'stuff' with J1 going to a switch. You might be lucky and have an open on the outside of the coils(s) near it's connection point(s). Ck the 'antenna shunt' coil, L2...maybe it went first. S1A feeds the grid of the rf amp...ck for burnt/open contacts. Also you can ck coils with an ohm meter to ck for opens. If you hve a signal gen you might be able to inject a signal at various points from the rf amp back and find a defective part. Agn, this is just some generic suggestions and I'm sure there are others on the list with a lot more knowledge than me. Good luck....73 de Bill K4JYS ----- Original Message ----- From: "Jeff" To: hallicrafters at mailman.qth.net Sent: Sunday, July 31, 2016 3:05:32 PM Subject: [Hallicrafters] SX-117 disaster Looking for some advice or consolation... Previously well working SX-117/HT-44 twins. I hadn't run them in a long time, and many cables got messed with in the mean time. Unfortunately, in my haste to hook the pair back up again, I got the transmitter output fed into the receiver antenna input... and then hit transmit to tune up the transmitter... It's taken me a while to stop cursing about it, but now my SX-117 is deaf as a post. A quick check of the RF amp and 1st mixer show that the tubes are OK. A signal generator on 14.250 is barely audible, but I can no longer get a good strong peak on the preselector. I can get a bit more of a peak on 40 meters, but it's still quite deaf. I had the rigs in 20 meters when the mishap occurred. It's just about acting like there's no antenna at all hooked to it. I get no increase in noise whether or not it's hooked to the antenna or dummy load. I've had the courage to admit I've done something heroically stupid -- so I'm reaching out to the list for any thoughts or guidance as to how to fix this. Jeff ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From kc9gq7 at gmail.com Sun Jul 31 17:57:51 2016 From: kc9gq7 at gmail.com (Rich Oliver) Date: Sun, 31 Jul 2016 14:57:51 -0700 Subject: [Hallicrafters] SX-117 disaster In-Reply-To: <506611777.4961665.1469994025836.JavaMail.root@embarqmail.com> References: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> <506611777.4961665.1469994025836.JavaMail.root@embarqmail.com> Message-ID: This will most commonly burn through the primary of the antenna coil. Usually the coil fails where the wire is exposed because bare wire has higher thermal resistance and melts first. I have run into two such failures and both were easy to fix. Good luck! 73, Rich On Sun, Jul 31, 2016 at 12:40 PM, Bill Stewart wrote: > Jeff, > I'm sure some of us have done the same thing. Hopefully, > your damage will be minimum. I am by far, no expert at this > but just looking at the input circuit I see several coils. > (Check or swap the rf tube...just something easy to ck.) > You might start at the rf amp and work back toward the ant > connection....esp. the one that had rf from the tx, and look > for charred areas on the coils and other parts. J2 has the most > 'stuff' with J1 going to a switch. You might be lucky and have > an open on the outside of the coils(s) near it's connection > point(s). Ck the 'antenna shunt' coil, L2...maybe it went first. > S1A feeds the grid of the rf amp...ck for burnt/open contacts. > Also you can ck coils with an ohm meter to ck for opens. If > you hve a signal gen you might be able to inject a signal at > various points from the rf amp back and find a defective part. > Agn, this is just some generic suggestions and I'm sure there are > others on the list with a lot more knowledge than me. > Good luck....73 de Bill K4JYS > > > ----- Original Message ----- > From: "Jeff" > To: hallicrafters at mailman.qth.net > Sent: Sunday, July 31, 2016 3:05:32 PM > Subject: [Hallicrafters] SX-117 disaster > > Looking for some advice or consolation... > > Previously well working SX-117/HT-44 twins. I hadn't run them in a long > time, and many cables got messed with in the mean time. Unfortunately, > in my haste to hook the pair back up again, I got the transmitter output > fed into the receiver antenna input... and then hit transmit to tune up > the transmitter... > > It's taken me a while to stop cursing about it, but now my SX-117 is > deaf as a post. A quick check of the RF amp and 1st mixer show that the > tubes are OK. A signal generator on 14.250 is barely audible, but I can > no longer get a good strong peak on the preselector. I can get a bit > more of a peak on 40 meters, but it's still quite deaf. I had the rigs > in 20 meters when the mishap occurred. > > It's just about acting like there's no antenna at all hooked to it. I > get no increase in noise whether or not it's hooked to the antenna or > dummy load. > > > I've had the courage to admit I've done something heroically stupid -- > so I'm reaching out to the list for any thoughts or guidance as to how > to fix this. > > > Jeff > > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From jeff at podengo.com Sun Jul 31 20:26:16 2016 From: jeff at podengo.com (Jeff) Date: Sun, 31 Jul 2016 20:26:16 -0400 Subject: [Hallicrafters] SX-117 disaster In-Reply-To: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> References: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> Message-ID: <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> Thanks to all the fast responses. I've drowned my grief a bit, and I did some disassembly. The Antenna coil surely does look like it got toasted. I've included an image on my webserver: http://www.podengo.com/sx117/L5.jpg In looking at it, it looks as if the coil form actually deformed (inside) so that the slug won't move past a certain point. I don't see any damage to rotary switches or other components. The 6DC6s test OK, but I don't have any replacements in my stock to try a different one. Anyone have any advice on the coil (or a spare you can part with?) Jeff On 7/31/2016 3:05 PM, Jeff wrote: > Looking for some advice or consolation... > > Previously well working SX-117/HT-44 twins. I hadn't run them in a > long time, and many cables got messed with in the mean time. > Unfortunately, in my haste to hook the pair back up again, I got the > transmitter output fed into the receiver antenna input... and then > hit transmit to tune up the transmitter... > > It's taken me a while to stop cursing about it, but now my SX-117 is > deaf as a post. A quick check of the RF amp and 1st mixer show that > the tubes are OK. A signal generator on 14.250 is barely audible, but > I can no longer get a good strong peak on the preselector. I can get > a bit more of a peak on 40 meters, but it's still quite deaf. I had > the rigs in 20 meters when the mishap occurred. > > It's just about acting like there's no antenna at all hooked to it. I > get no increase in noise whether or not it's hooked to the antenna or > dummy load. > > > I've had the courage to admit I've done something heroically stupid -- > so I'm reaching out to the list for any thoughts or guidance as to how > to fix this. > > > Jeff > > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html From rsauvan at beyondbb.com Sun Jul 31 20:51:14 2016 From: rsauvan at beyondbb.com (Robert Sauvan) Date: Sun, 31 Jul 2016 18:51:14 -0600 Subject: [Hallicrafters] SX-117 disaster In-Reply-To: <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> References: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> Message-ID: <7495bdd2-5e60-be76-4f5f-d26e9e778699@beyondbb.com> Jeff, I did the exact same thing on a Hammarlund receiver. Here is a link to see how I fixed the coil that I destroyed. Not a hard fix at all. http://w0ybs.com/w0ybs_004.htm Good luck- Bob-W0YBS On 7/31/2016 6:26 PM, Jeff wrote: > Thanks to all the fast responses. I've drowned my grief a bit, and I > did some disassembly. The Antenna coil surely does look like it got > toasted. I've included an image on my webserver: > > > http://www.podengo.com/sx117/L5.jpg > > > In looking at it, it looks as if the coil form actually deformed > (inside) so that the slug won't move past a certain point. I don't > see any damage to rotary switches or other components. The 6DC6s test > OK, but I don't have any replacements in my stock to try a different one. > > Anyone have any advice on the coil (or a spare you can part with?) > > > Jeff > > > > On 7/31/2016 3:05 PM, Jeff wrote: >> Looking for some advice or consolation... >> >> Previously well working SX-117/HT-44 twins. I hadn't run them in a >> long time, and many cables got messed with in the mean time. >> Unfortunately, in my haste to hook the pair back up again, I got the >> transmitter output fed into the receiver antenna input... and then >> hit transmit to tune up the transmitter... >> >> It's taken me a while to stop cursing about it, but now my SX-117 is >> deaf as a post. A quick check of the RF amp and 1st mixer show that >> the tubes are OK. A signal generator on 14.250 is barely audible, >> but I can no longer get a good strong peak on the preselector. I can >> get a bit more of a peak on 40 meters, but it's still quite deaf. I >> had the rigs in 20 meters when the mishap occurred. >> >> It's just about acting like there's no antenna at all hooked to it. >> I get no increase in noise whether or not it's hooked to the antenna >> or dummy load. >> >> >> I've had the courage to admit I've done something heroically stupid >> -- so I'm reaching out to the list for any thoughts or guidance as to >> how to fix this. >> >> >> Jeff >> >> >> ______________________________________________________________ >> Hallicrafters mailing list >> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Hallicrafters at mailman.qth.net >> >> List Administrator: Duane Fischer, W8DBF >> ** For Assistance: dfischer at usol.com ** >> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Thanks Bob Sauvan-W0YBS rsauvan at beyondbb.com http://w0ybs.com From k9ffk at comcast.net Sun Jul 31 22:33:09 2016 From: k9ffk at comcast.net (K9FFK) Date: Sun, 31 Jul 2016 21:33:09 -0500 Subject: [Hallicrafters] SX-117 disaster In-Reply-To: <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> References: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> Message-ID: <181c041b-3a62-fd59-d821-54cdb4c0d56e@comcast.net> Wow. L5 certainly did get hot but from the image I don't see any shorted turns, just missing enamel on some wire. Could RF heating change the properties of the slug? I wouldn't junk that coil just yet, though. The RF has to pass through L1A-C1 and by L1B-C2 to get to the L5 link. L1a-C1 and L1B-C2 are the 6.5 Mhz trap. How does L1 look? curious. Dick, K9FFK On 7/31/2016 7:26 PM, Jeff wrote: > Thanks to all the fast responses. I've drowned my grief a bit, and I > did some disassembly. The Antenna coil surely does look like it got > toasted. I've included an image on my webserver: > > > http://www.podengo.com/sx117/L5.jpg > > > In looking at it, it looks as if the coil form actually deformed > (inside) so that the slug won't move past a certain point. I don't > see any damage to rotary switches or other components. The 6DC6s test > OK, but I don't have any replacements in my stock to try a different one. > > Anyone have any advice on the coil (or a spare you can part with?) > > > Jeff > > > > On 7/31/2016 3:05 PM, Jeff wrote: >> Looking for some advice or consolation... >> >> Previously well working SX-117/HT-44 twins. I hadn't run them in a >> long time, and many cables got messed with in the mean time. >> Unfortunately, in my haste to hook the pair back up again, I got the >> transmitter output fed into the receiver antenna input... and then >> hit transmit to tune up the transmitter... >> >> It's taken me a while to stop cursing about it, but now my SX-117 is >> deaf as a post. A quick check of the RF amp and 1st mixer show that >> the tubes are OK. A signal generator on 14.250 is barely audible, >> but I can no longer get a good strong peak on the preselector. I can >> get a bit more of a peak on 40 meters, but it's still quite deaf. I >> had the rigs in 20 meters when the mishap occurred. >> >> It's just about acting like there's no antenna at all hooked to it. >> I get no increase in noise whether or not it's hooked to the antenna >> or dummy load. >> >> >> I've had the courage to admit I've done something heroically stupid >> -- so I'm reaching out to the list for any thoughts or guidance as to >> how to fix this. >> >> >> Jeff >> >> >> ______________________________________________________________ >> Hallicrafters mailing list >> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Hallicrafters at mailman.qth.net >> >> List Administrator: Duane Fischer, W8DBF >> ** For Assistance: dfischer at usol.com ** >> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From k9ffk at comcast.net Sun Jul 31 22:44:40 2016 From: k9ffk at comcast.net (K9FFK) Date: Sun, 31 Jul 2016 21:44:40 -0500 Subject: [Hallicrafters] SX-117 disaster In-Reply-To: <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> References: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> Message-ID: Jeff: C4 is also a suspect. Its a 300V mica. If it is shorted, AVC goes to ground through L5 along with V1's bias...red plates. If it is open, no signal. V1 is normal. Receiver is deaf. Dick, K9FFK On 7/31/2016 7:26 PM, Jeff wrote: > Thanks to all the fast responses. I've drowned my grief a bit, and I > did some disassembly. The Antenna coil surely does look like it got > toasted. I've included an image on my webserver: > > > http://www.podengo.com/sx117/L5.jpg > > > In looking at it, it looks as if the coil form actually deformed > (inside) so that the slug won't move past a certain point. I don't > see any damage to rotary switches or other components. The 6DC6s test > OK, but I don't have any replacements in my stock to try a different one. > > Anyone have any advice on the coil (or a spare you can part with?) > > > Jeff > > > > On 7/31/2016 3:05 PM, Jeff wrote: >> Looking for some advice or consolation... >> >> Previously well working SX-117/HT-44 twins. I hadn't run them in a >> long time, and many cables got messed with in the mean time. >> Unfortunately, in my haste to hook the pair back up again, I got the >> transmitter output fed into the receiver antenna input... and then >> hit transmit to tune up the transmitter... >> >> It's taken me a while to stop cursing about it, but now my SX-117 is >> deaf as a post. A quick check of the RF amp and 1st mixer show that >> the tubes are OK. A signal generator on 14.250 is barely audible, >> but I can no longer get a good strong peak on the preselector. I can >> get a bit more of a peak on 40 meters, but it's still quite deaf. I >> had the rigs in 20 meters when the mishap occurred. >> >> It's just about acting like there's no antenna at all hooked to it. >> I get no increase in noise whether or not it's hooked to the antenna >> or dummy load. >> >> >> I've had the courage to admit I've done something heroically stupid >> -- so I'm reaching out to the list for any thoughts or guidance as to >> how to fix this. >> >> >> Jeff >> >> >> ______________________________________________________________ >> Hallicrafters mailing list >> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Hallicrafters at mailman.qth.net >> >> List Administrator: Duane Fischer, W8DBF >> ** For Assistance: dfischer at usol.com ** >> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From 1oldlens1 at ix.netcom.com Sun Jul 31 23:46:04 2016 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Sun, 31 Jul 2016 20:46:04 -0700 Subject: [Hallicrafters] SX-117 disaster In-Reply-To: <181c041b-3a62-fd59-d821-54cdb4c0d56e@comcast.net> References: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> <181c041b-3a62-fd59-d821-54cdb4c0d56e@comcast.net> Message-ID: <59e465f1-7c73-f798-80a9-2bf766588b0b@ix.netcom.com> I think the burned part is the end of the coil on a slightly larger former, perhaps meant to slide over the main former. Heat could affect the slug, depending on what its made of but more likely has swollen or warped the former. It doesn't look too bad. If you can move the slug away from the cooked part see what the former looks like inside. Perhaps if its distorted a little you can straighten it with something like the end of a drill bit the right diameter. I had a worse case on an RCA AR-88 I rebuilt, two of the antenna coils had been heated to the point of distorting. Both coils were wound on polystyrene formers so they melted pretty thoroughly. I was lucky enough to be able to get two new ones from someone, I think in Oz land. My first indication that something was very wrong was when the slugs would not move. Since this former appears to be Bakelite its possible its not so bad, at least it would not melt. If the wire is still there and has not parted it may only be necessary to re-solder it at the terminals. Otherwise it must be rewound, not too big a job. Either a repaired coil or new coil should get a dose of "Q-Dope". You can make your own by dissolving white polyfoam in Xylene or MEK. Takes a while, it should be the consistency of honey. Polyfoam is pure polystyrene which has very low loss so it won't affect the Q of the coil. Good luck with the project, the SX-117 is well worth the effort to fix. On 7/31/2016 7:33 PM, K9FFK wrote: > Wow. L5 certainly did get hot but from the image I don't see any shorted > turns, just missing enamel on some wire. > > Could RF heating change the properties of the slug? > > I wouldn't junk that coil just yet, though. The RF has to pass through > L1A-C1 and by L1B-C2 to get to the L5 link. > > L1a-C1 and L1B-C2 are the 6.5 Mhz trap. How does L1 look? > > curious. > > Dick, K9FFK > > > On 7/31/2016 7:26 PM, Jeff wrote: >> Thanks to all the fast responses. I've drowned my grief a bit, and I >> did some disassembly. The Antenna coil surely does look like it got >> toasted. I've included an image on my webserver: >> >> >> http://www.podengo.com/sx117/L5.jpg >> >> >> In looking at it, it looks as if the coil form actually deformed >> (inside) so that the slug won't move past a certain point. I don't >> see any damage to rotary switches or other components. The 6DC6s test >> OK, but I don't have any replacements in my stock to try a different one. >> >> Anyone have any advice on the coil (or a spare you can part with?) >> >> >> Jeff >> >> >> >> On 7/31/2016 3:05 PM, Jeff wrote: >>> Looking for some advice or consolation... >>> >>> Previously well working SX-117/HT-44 twins. I hadn't run them in a >>> long time, and many cables got messed with in the mean time. >>> Unfortunately, in my haste to hook the pair back up again, I got the >>> transmitter output fed into the receiver antenna input... and then >>> hit transmit to tune up the transmitter... >>> >>> It's taken me a while to stop cursing about it, but now my SX-117 is >>> deaf as a post. A quick check of the RF amp and 1st mixer show that >>> the tubes are OK. A signal generator on 14.250 is barely audible, >>> but I can no longer get a good strong peak on the preselector. I can >>> get a bit more of a peak on 40 meters, but it's still quite deaf. I >>> had the rigs in 20 meters when the mishap occurred. >>> >>> It's just about acting like there's no antenna at all hooked to it. >>> I get no increase in noise whether or not it's hooked to the antenna >>> or dummy load. >>> >>> >>> I've had the courage to admit I've done something heroically stupid >>> -- so I'm reaching out to the list for any thoughts or guidance as to >>> how to fix this. >>> >>> >>> Jeff >>> >>> >>> ______________________________________________________________ >>> Hallicrafters mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Hallicrafters at mailman.qth.net >>> >>> List Administrator: Duane Fischer, W8DBF >>> ** For Assistance: dfischer at usol.com ** >>> >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> >> ______________________________________________________________ >> Hallicrafters mailing list >> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Hallicrafters at mailman.qth.net >> >> List Administrator: Duane Fischer, W8DBF >> ** For Assistance: dfischer at usol.com ** >> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Richard Knoppow 1oldlens1 at ix.netcom.com WB6KBL From 1oldlens1 at ix.netcom.com Sun Jul 31 23:47:56 2016 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Sun, 31 Jul 2016 20:47:56 -0700 Subject: [Hallicrafters] SX-117 disaster In-Reply-To: References: <8cfe251b-876d-bb16-702a-7801a7124107@podengo.com> <49b71e3d-017f-4064-aba3-37088e3e9bd4@podengo.com> Message-ID: Well, the cap is easy enough to check, a VOM will tell you if its shorted and depending on the value may give you a kick if its OK. My guess is that its OK. On 7/31/2016 7:44 PM, K9FFK wrote: > Jeff: > > C4 is also a suspect. Its a 300V mica. > > If it is shorted, AVC goes to ground through L5 along with V1's > bias...red plates. > > If it is open, no signal. V1 is normal. Receiver is deaf. > > Dick, K9FFK > > > On 7/31/2016 7:26 PM, Jeff wrote: >> Thanks to all the fast responses. I've drowned my grief a bit, and I >> did some disassembly. The Antenna coil surely does look like it got >> toasted. I've included an image on my webserver: >> >> >> http://www.podengo.com/sx117/L5.jpg >> >> >> In looking at it, it looks as if the coil form actually deformed >> (inside) so that the slug won't move past a certain point. I don't >> see any damage to rotary switches or other components. The 6DC6s test >> OK, but I don't have any replacements in my stock to try a different one. >> >> Anyone have any advice on the coil (or a spare you can part with?) >> >> >> Jeff >> >> >> >> On 7/31/2016 3:05 PM, Jeff wrote: >>> Looking for some advice or consolation... >>> >>> Previously well working SX-117/HT-44 twins. I hadn't run them in a >>> long time, and many cables got messed with in the mean time. >>> Unfortunately, in my haste to hook the pair back up again, I got the >>> transmitter output fed into the receiver antenna input... and then >>> hit transmit to tune up the transmitter... >>> >>> It's taken me a while to stop cursing about it, but now my SX-117 is >>> deaf as a post. A quick check of the RF amp and 1st mixer show that >>> the tubes are OK. A signal generator on 14.250 is barely audible, >>> but I can no longer get a good strong peak on the preselector. I can >>> get a bit more of a peak on 40 meters, but it's still quite deaf. I >>> had the rigs in 20 meters when the mishap occurred. >>> >>> It's just about acting like there's no antenna at all hooked to it. >>> I get no increase in noise whether or not it's hooked to the antenna >>> or dummy load. >>> >>> >>> I've had the courage to admit I've done something heroically stupid >>> -- so I'm reaching out to the list for any thoughts or guidance as to >>> how to fix this. >>> >>> >>> Jeff >>> >>> >>> ______________________________________________________________ >>> Hallicrafters mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Hallicrafters at mailman.qth.net >>> >>> List Administrator: Duane Fischer, W8DBF >>> ** For Assistance: dfischer at usol.com ** >>> >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> >> ______________________________________________________________ >> Hallicrafters mailing list >> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Hallicrafters at mailman.qth.net >> >> List Administrator: Duane Fischer, W8DBF >> ** For Assistance: dfischer at usol.com ** >> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Richard Knoppow 1oldlens1 at ix.netcom.com WB6KBL

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