From MLangston at QuantaServices.com Mon Nov 2 15:56:57 2015 From: MLangston at QuantaServices.com (Langston, Mike) Date: Mon, 2 Nov 2015 14:56:57 -0600 Subject: [Hallicrafters] Audio Output Xfrmr Message-ID: I salvaged one of these from an S-53 rcvr. The S-53 uses a 6K6 audio amp tube to a 4 ohm speaker. I am building a Class A audio amp using a 6V6 amp tube to a 4 ohm speaker. About 4.5-5 watts. Can this audio output Xfrmr be reused using the 6V6 tube? Thanks, Mike KL7CD Sent from my iPhone From pincon at erols.com Mon Nov 2 16:20:02 2015 From: pincon at erols.com (Charlie T, K3ICH) Date: Mon, 2 Nov 2015 16:20:02 -0500 Subject: [Hallicrafters] Audio Output Xfrmr In-Reply-To: References: Message-ID: <00ba01d115b4$419d75f0$c4d861d0$@erols.com> In a pinch, you can user a 6.3V filament transformer. Just use the normal 120 V primary to the B+ & plate with the filament winding to the speaker. 73, Charlie k3ICH -----Original Message----- From: Hallicrafters [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Langston, Mike Sent: Monday, November 02, 2015 3:57 PM To: hallicrafters at mailman.qth.net Subject: [Hallicrafters] Audio Output Xfrmr I salvaged one of these from an S-53 rcvr. The S-53 uses a 6K6 audio amp tube to a 4 ohm speaker. I am building a Class A audio amp using a 6V6 amp tube to a 4 ohm speaker. About 4.5-5 watts. Can this audio output Xfrmr be reused using the 6V6 tube? Thanks, Mike KL7CD Sent from my iPhone __________________________________________________ ____________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicraft ers Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From n8azc at sssnet.com Mon Nov 2 16:59:25 2015 From: n8azc at sssnet.com (Mike Lopez) Date: Mon, 2 Nov 2015 16:59:25 -0500 Subject: [Hallicrafters] Audio Output Xfrmr In-Reply-To: References: Message-ID: <001501d115b9$bd0ddb30$37299190$@sssnet.com> I would say yes, but better check current ratings. 6v6 is a better newer 6K6. A bit more output so maybe more current? Mike N8AZC -----Original Message----- From: Hallicrafters [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Langston, Mike Sent: Monday, November 02, 2015 3:57 PM To: hallicrafters at mailman.qth.net Subject: [Hallicrafters] Audio Output Xfrmr I salvaged one of these from an S-53 rcvr. The S-53 uses a 6K6 audio amp tube to a 4 ohm speaker. I am building a Class A audio amp using a 6V6 amp tube to a 4 ohm speaker. About 4.5-5 watts. Can this audio output Xfrmr be reused using the 6V6 tube? Thanks, Mike KL7CD Sent from my iPhone ______________________________________________________________ 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 k7mks at comcast.net Tue Nov 3 20:40:39 2015 From: k7mks at comcast.net (k7mks at comcast.net) Date: Wed, 4 Nov 2015 01:40:39 +0000 (UTC) Subject: [Hallicrafters] SX-101A Green Cover Manual FS In-Reply-To: <857500686.14187385.1446600985162.JavaMail.zimbra@comcast.net> Message-ID: <443975946.14188813.1446601239325.JavaMail.zimbra@comcast.net> Nice unmarked condx. Front cover needs a smidgeon of tape. $7 mailed USPS. joe k7mks From k5mbx at suddenlink.net Sat Nov 7 17:00:26 2015 From: k5mbx at suddenlink.net (Charlie Hugg) Date: Sat, 7 Nov 2015 16:00:26 -0600 Subject: [Hallicrafters] FS Hallicrafters R-42 Speaker Message-ID: <000601d119a7$b5a3d1a0$20eb74e0$@net> FS Hallicrafters R-42 Speaker. High end speaker, made in late 1940s. Two position switch for Hi-Fi/Communications. Otherwise known as "Reproducer." Matches earlier SX series receivers, but works with all. 600 ohms. VG Condition. Front Panel is very nice, sides of cabinet are good, but top has some scratches in the paint. Sounds wonderful. Pictures available, Will pack well. Price is $95 Plus shipping. Thanks, Charlie Hugg, K5MBX From karel at alberta02.com Sun Nov 8 12:38:54 2015 From: karel at alberta02.com (Karel J) Date: Sun, 8 Nov 2015 12:38:54 -0500 Subject: [Hallicrafters] SX-32 audio amp question. Message-ID: Hi, writing this on my phone from the ladies clothing store. Please forgive crappy formatting. I moved fairly recently and have been working to get my hamshack up and running. My sx-32 needed some minor repairs and alignment. No problem, but I noticed one of the 6V6 tubes was not lit. The other was quite hot, and audio sounded OK. I slapped in a replacement, and the radio is again happy. Since these are two 6V6 in push-pull, do I need to worry about matched tubes? They were the same brand, which leads me to think they may have been a matched pair. Getting on fleabay shows me a few options for tubes. Normally, I buy NOS or good tested tubes from hamfests or a place in Vancouver. Anyway, I am seeing these *new* tung-sol branded tubes. Back from a few years ago, you could still get Svetlana 12ax7s (the winged c logo, I think) and they were great quality. So, should I bother worrying about matched tubes? If so, new or verified used? Or NOS? Thanks everyone. From 1oldlens1 at ix.netcom.com Sun Nov 8 23:14:17 2015 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Sun, 8 Nov 2015 20:14:17 -0800 Subject: [Hallicrafters] SX-32 audio amp question. In-Reply-To: References: Message-ID: <56401D99.1080805@ix.netcom.com> Unless the tubes are very different they do not need to be matched. The amp in the SX-32 runs AB1, very nearly Class A. Also, the cathode resistor is unbypassed so there is a little feedback which tends to compensate for any distortion from unbalance. Its worth checking the values of the resistors in the audio circuit to make sure they are close to the right values. If you want to be fussy you can check the tubes for similar mu on a tube checker but exact match is not necessary. On 11/8/2015 9:38 AM, Karel J wrote: > Hi, writing this on my phone from the ladies clothing store. Please forgive > crappy formatting. > > I moved fairly recently and have been working to get my hamshack up and > running. > > My sx-32 needed some minor repairs and alignment. No problem, but I noticed > one of the 6V6 tubes was not lit. > > The other was quite hot, and audio sounded OK. I slapped in a replacement, > and the radio is again happy. > > Since these are two 6V6 in push-pull, do I need to worry about matched > tubes? They were the same brand, which leads me to think they may have been > a matched pair. > > Getting on fleabay shows me a few options for tubes. Normally, I buy NOS or > good tested tubes from hamfests or a place in Vancouver. Anyway, I am > seeing these *new* tung-sol branded tubes. > > Back from a few years ago, you could still get Svetlana 12ax7s (the winged > c logo, I think) and they were great quality. > > So, should I bother worrying about matched tubes? If so, new or verified > used? Or NOS? > > Thanks everyone. > ______________________________________________________________ > 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 Nov 8 23:51:26 2015 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Sun, 8 Nov 2015 20:51:26 -0800 Subject: [Hallicrafters] SX-32 audio amp question. In-Reply-To: <56401D99.1080805@ix.netcom.com> References: <56401D99.1080805@ix.netcom.com> Message-ID: <5640264E.1090408@ix.netcom.com> Let me clarify, the tubes need only a rough match, they should not be radically different but any two tubes in reasonable condition should match well enough. There are circumstances where a close match is necessary, for instance in a Class B amplifier but not in Class A or AB1 amps. If you want absolutely minimum distortion you must match everything, resistors, capacitors, tubes, transformer windings, etc. Not needed here. The SX-32 is an interesting receiver. Evidently a cost reduced version of the SX-28 but with nearly equal performance. On 11/8/2015 8:14 PM, Richard Knoppow wrote: > Unless the tubes are very different they do not need to be matched. > The amp in the SX-32 runs AB1, very nearly Class A. Also, the cathode > resistor is unbypassed so there is a little feedback which tends to > compensate for any distortion from unbalance. Its worth checking the > values of the resistors in the audio circuit to make sure they are > close to the right values. If you want to be fussy you can check the > tubes for similar mu on a tube checker but exact match is not necessary. > > On 11/8/2015 9:38 AM, Karel J wrote: >> Hi, writing this on my phone from the ladies clothing store. Please >> forgive >> crappy formatting. >> >> I moved fairly recently and have been working to get my hamshack up and >> running. >> >> My sx-32 needed some minor repairs and alignment. No problem, but I >> noticed >> one of the 6V6 tubes was not lit. >> >> The other was quite hot, and audio sounded OK. I slapped in a >> replacement, >> and the radio is again happy. >> >> Since these are two 6V6 in push-pull, do I need to worry about matched >> tubes? They were the same brand, which leads me to think they may >> have been >> a matched pair. >> >> Getting on fleabay shows me a few options for tubes. Normally, I buy >> NOS or >> good tested tubes from hamfests or a place in Vancouver. Anyway, I am >> seeing these *new* tung-sol branded tubes. >> >> Back from a few years ago, you could still get Svetlana 12ax7s (the >> winged >> c logo, I think) and they were great quality. >> >> So, should I bother worrying about matched tubes? If so, new or verified >> used? Or NOS? >> >> Thanks everyone. >> ______________________________________________________________ >> 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 karel at alberta02.com Mon Nov 9 12:10:30 2015 From: karel at alberta02.com (Karel J) Date: Mon, 9 Nov 2015 12:10:30 -0500 Subject: [Hallicrafters] SX-32 audio amp question. In-Reply-To: <5640264E.1090408@ix.netcom.com> References: <56401D99.1080805@ix.netcom.com> <5640264E.1090408@ix.netcom.com> Message-ID: Thanks everyone for your replies. Yes, the SX-32 is a neat radio. It doesn't have the filters of a 28. I always wanted a 28, and this radio came along, almost fully restored. Of course that was a few years and miles ago, both my big tube radios didn't move across the country as well as expected. I'm glad to not have to worry about perfectly matched tubes. The one I pulled out of my hq-129x hammarlund is working fine, so I'll just buy one for the hammarlund and be on my way. As usual the list is full of knowledge and helpfulness. Regards, Karel VE3KJX From 1oldlens1 at ix.netcom.com Mon Nov 9 21:24:22 2015 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Mon, 9 Nov 2015 18:24:22 -0800 Subject: [Hallicrafters] SX-32 audio amp question. References: <56401D99.1080805@ix.netcom.com> <5640264E.1090408@ix.netcom.com> Message-ID: <4A9A24FF46E84F3E82B10A6A120958EE@VALUED20606295> The main difference between the SX-28 and SX-32 is that the 32 does not have the Lamb Noise Blanker. This was a highly touted feature of the 28 but was dissapointing in practice. I think users expected too much of it. A late service bulletiin for the 28 advised removing the noise blanker and replacing it with a conventional series-valve noise limiter. The 32 comes with a diode noise limiter but still has three IF amplfiers and two variable bandwidth IF transformers. There are other differences but I've forgotten them and you can discover them from comparing the handbooks. Hallicrafters made a few receivers that were supposed to be very advanced but were not engineered throughly enough, the SX-88 being another. The SX-28 was a very good receiver but many of its virtues can be found in the SX-32 which was significantly cheaper. Hallicrafters often adopted new and advanced technology but its application sometimes left a bit to be desired. They did best in offering high value at reasonable cost rather than world-class equipment. Nonetheless they made some very good stuff and very little junk. -- Richard Knoppow Los Angeles WB6KBL dickburk at ix.netcom.com ----- Original Message ----- From: "Karel J" To: Sent: Monday, November 09, 2015 9:10 AM Subject: Re: [Hallicrafters] SX-32 audio amp question. > Thanks everyone for your replies. > > Yes, the SX-32 is a neat radio. It doesn't have the > filters of a 28. I > always wanted a 28, and this radio came along, almost > fully restored. Of > course that was a few years and miles ago, both my big > tube radios didn't > move across the country as well as expected. > > I'm glad to not have to worry about perfectly matched > tubes. The one I > pulled out of my hq-129x hammarlund is working fine, so > I'll just buy one > for the hammarlund and be on my way. > > As usual the list is full of knowledge and helpfulness. > > Regards, > > Karel VE3KJX > ______________________________________________________________ > 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 kc9cdt at aol.com Tue Nov 10 09:12:02 2015 From: kc9cdt at aol.com (kc9cdt at aol.com) Date: Tue, 10 Nov 2015 09:12:02 -0500 Subject: [Hallicrafters] SX-115 FS Message-ID: <150f1bd3e15-305b-a77b@webprd-m17.mail.aol.com> Halli gang..... I have an EXCELLANT Hallicrafters SX-115 FS. Great cosmetic and works fine as well. If you looking for a collector quality SX-115 this would in my opinion be a great choice. I will not ship this unless you want to have me take it to a place that will pack, insure &ship it for you. I am now in Ocala, FL and would meet some reasonable distance. $1500. 73, Lee 260-403-6936 Cell From gsteffens at bevcomm.net Mon Nov 16 21:16:57 2015 From: gsteffens at bevcomm.net (Gerry Steffens) Date: Mon, 16 Nov 2015 20:16:57 -0600 Subject: [Hallicrafters] SX-17 question Message-ID: <001301d120de$0f27cc30$2d776490$@bevcomm.net> I have a nice complete SX-17 which is about to become a current project. I have two manuals, one original and a copy I picked up some time ago. Both are identified as 03153817 on the front cover. The first thing I did was to restore the original manual. All text is identical in the two manuals. However, I noticed that several resistors and capacitors are of different value between the two. Further, the AVC switch is a SPST in one and a DPDT in the other. Schematics show the differing switches accordingly. The copy has a date on the schematic of 9-14-4? (no amount of magnification will make that smudge readable). The original book has no date marking and shows the SPST AVC switch. The copy has the date and the DPDT switch. I have not yet completed the schematic comparison. My guess is that the copy manual showing the DPDT switch is the later manual. I don't yet know which version the radio is, as I have not yet grunted it out. The question is, should I attempt to reconnect the radio to match the later manual if the radio is the earlier version? Is there a documentation of the various changes for the SX-17, S-17 as I have for the SX-42? For the 42, I have a large schematic with all updates through update G or H documented, including dates? Thanks, Gerry Gerald L Steffens P.E. Oronoco MN Radio Historian Collecting & restoring McMurdo Silver, E.H. Scott, Hallicrafters, National, Heath, Zenith Transoceanic and any other interesting radios Collection stands at about 300 radios and several classic Oldsmobiles From joeconnor53 at yahoo.com Mon Nov 16 21:30:02 2015 From: joeconnor53 at yahoo.com (Joe Connor) Date: Tue, 17 Nov 2015 02:30:02 +0000 (UTC) Subject: [Hallicrafters] SX-17 question In-Reply-To: <001301d120de$0f27cc30$2d776490$@bevcomm.net> References: <001301d120de$0f27cc30$2d776490$@bevcomm.net> Message-ID: <1222225679.4836061.1447727402330.JavaMail.yahoo@mail.yahoo.com> Gerry, as far as documentation of the changes is concerned, you might want to check Rider's, which shows an early SX-17, a late SX-17 and a 1939 model SX-17. By the way, they are very cool receivers and are a lot of fun to restore and use.? Joe Connor http://www.nostalgiaair.org/Resources/178/T0000178.htm On Monday, November 16, 2015 9:17 PM, Gerry Steffens wrote: I have a nice complete SX-17 which is about to become a current project. I have two manuals, one original and a copy I picked up some time ago.? Both are identified as 03153817 on the front cover.? The first thing I did was to restore the original manual. All text is identical in the two manuals.? However, I noticed that several resistors and capacitors are of different value between the two.? Further, the AVC switch is a SPST in one and a DPDT in the other.? Schematics show the differing switches accordingly.? The copy has a date on the schematic of 9-14-4? (no amount of magnification will make that smudge readable).? The original book has no date marking and shows the SPST AVC switch.? The copy has the date and the DPDT switch. I have not yet completed the schematic comparison.? My guess is that the copy manual showing the DPDT switch is the later manual. I don't yet know which version the radio is, as I have not yet grunted it out. The question is, should I attempt to reconnect the radio to match the later manual if the radio is the earlier version? Is there a documentation of the various changes for the SX-17, S-17 as I have for the SX-42?? For the 42, I have a large schematic with all updates through update G or H documented, including dates? Thanks, Gerry Gerald L Steffens P.E. Oronoco MN Radio Historian Collecting & restoring McMurdo Silver, E.H. Scott, Hallicrafters, National, Heath, Zenith Transoceanic and any other interesting radios Collection stands at about 300 radios and several classic Oldsmobiles ______________________________________________________________ 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 jbalestrini at surewest.net Tue Nov 17 00:42:14 2015 From: jbalestrini at surewest.net (Joe Balestrini) Date: Mon, 16 Nov 2015 21:42:14 -0800 Subject: [Hallicrafters] SX-17 question In-Reply-To: <1222225679.4836061.1447727402330.JavaMail.yahoo@mail.yahoo.com> References: <001301d120de$0f27cc30$2d776490$@bevcomm.net> <1222225679.4836061.1447727402330.JavaMail.yahoo@mail.yahoo.com> Message-ID: Hi Gerry, I have an SX-17 manual that might be of some help. I?ll look at it in the morning and advise. Joe KG6IMI > On Nov 16, 2015, at 6:30 PM, Joe Connor via Hallicrafters wrote: > > Gerry, as far as documentation of the changes is concerned, you might want to check Rider's, which shows an early SX-17, a late SX-17 and a 1939 model SX-17. > By the way, they are very cool receivers and are a lot of fun to restore and use. > Joe Connor > http://www.nostalgiaair.org/Resources/178/T0000178.htm > > > > On Monday, November 16, 2015 9:17 PM, Gerry Steffens wrote: > > > > I have a nice complete SX-17 which is about to become a current project. > > I have two manuals, one original and a copy I picked up some time ago. Both > are identified as 03153817 on the front cover. The first thing I did was to > restore the original manual. > > All text is identical in the two manuals. However, I noticed that several > resistors and capacitors are of different value between the two. Further, > the AVC switch is a SPST in one and a DPDT in the other. Schematics show > the differing switches accordingly. The copy has a date on the schematic of > 9-14-4? (no amount of magnification will make that smudge readable). The > original book has no date marking and shows the SPST AVC switch. The copy > has the date and the DPDT switch. > > I have not yet completed the schematic comparison. My guess is that the > copy manual showing the DPDT switch is the later manual. > > I don't yet know which version the radio is, as I have not yet grunted it > out. > > The question is, should I attempt to reconnect the radio to match the later > manual if the radio is the earlier version? > > Is there a documentation of the various changes for the SX-17, S-17 as I > have for the SX-42? For the 42, I have a large schematic with all updates > through update G or H documented, including dates? > > Thanks, > > Gerry > > > Gerald L Steffens P.E. > Oronoco MN > Radio Historian > > Collecting & restoring McMurdo Silver, E.H. Scott, > Hallicrafters, National, Heath, Zenith Transoceanic > and any other interesting radios > > Collection stands at about 300 radios and several classic Oldsmobiles > > > ______________________________________________________________ > 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 kc9gq7 at gmail.com Tue Nov 17 15:07:30 2015 From: kc9gq7 at gmail.com (Rich Oliver) Date: Tue, 17 Nov 2015 13:07:30 -0700 Subject: [Hallicrafters] SX-17 question In-Reply-To: References: <001301d120de$0f27cc30$2d776490$@bevcomm.net> <1222225679.4836061.1447727402330.JavaMail.yahoo@mail.yahoo.com> Message-ID: How about posting notes along the way? My SX-17 is the restoration queue, too. 73, Rich On Mon, Nov 16, 2015 at 10:42 PM, Joe Balestrini wrote: > Hi Gerry, > > I have an SX-17 manual that might be of some help. I?ll look at it in the > morning and advise. > > Joe KG6IMI > > > > On Nov 16, 2015, at 6:30 PM, Joe Connor via Hallicrafters < > hallicrafters at mailman.qth.net> wrote: > > > > Gerry, as far as documentation of the changes is concerned, you might > want to check Rider's, which shows an early SX-17, a late SX-17 and a 1939 > model SX-17. > > By the way, they are very cool receivers and are a lot of fun to restore > and use. > > Joe Connor > > http://www.nostalgiaair.org/Resources/178/T0000178.htm > > > > > > > > On Monday, November 16, 2015 9:17 PM, Gerry Steffens < > gsteffens at bevcomm.net> wrote: > > > > > > > > I have a nice complete SX-17 which is about to become a current project. > > > > I have two manuals, one original and a copy I picked up some time ago. > Both > > are identified as 03153817 on the front cover. The first thing I did > was to > > restore the original manual. > > > > All text is identical in the two manuals. However, I noticed that > several > > resistors and capacitors are of different value between the two. > Further, > > the AVC switch is a SPST in one and a DPDT in the other. Schematics show > > the differing switches accordingly. The copy has a date on the > schematic of > > 9-14-4? (no amount of magnification will make that smudge readable). The > > original book has no date marking and shows the SPST AVC switch. The > copy > > has the date and the DPDT switch. > > > > I have not yet completed the schematic comparison. My guess is that the > > copy manual showing the DPDT switch is the later manual. > > > > I don't yet know which version the radio is, as I have not yet grunted it > > out. > > > > The question is, should I attempt to reconnect the radio to match the > later > > manual if the radio is the earlier version? > > > > Is there a documentation of the various changes for the SX-17, S-17 as I > > have for the SX-42? For the 42, I have a large schematic with all > updates > > through update G or H documented, including dates? > > > > Thanks, > > > > Gerry > > > > > > Gerald L Steffens P.E. > > Oronoco MN > > Radio Historian > > > > Collecting & restoring McMurdo Silver, E.H. Scott, > > Hallicrafters, National, Heath, Zenith Transoceanic > > and any other interesting radios > > > > Collection stands at about 300 radios and several classic Oldsmobiles > > > > > > ______________________________________________________________ > > 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 > From pincon at erols.com Wed Nov 18 09:38:29 2015 From: pincon at erols.com (Charlie T, K3ICH) Date: Wed, 18 Nov 2015 09:38:29 -0500 Subject: [Hallicrafters] For those who celebrate Thanksgiving Message-ID: <005501d1220e$ce0dea40$6a29bec0$@erols.com> In case I forget, I hope everyone (who celebrates it) has a very Happy Thanksgiving Holiday next week. Just be SURE to set your scales back 10 lbs. next Wednesday night. 73, Charlie k3ICH From robert at isquare.com Thu Nov 26 09:16:14 2015 From: robert at isquare.com (Bob Sullivan) Date: Thu, 26 Nov 2015 09:16:14 -0500 Subject: [Hallicrafters] SX-88 Glass Message-ID: I have an extra pair of reproduction SX-88 glass windows. Perfect silk screening. Photo on request. $50ppd. 73, Bob W?YVA http://www.isquare.com/personal_pages/ras-hardware.htm From jeff at podengo.com Sun Nov 29 17:03:52 2015 From: jeff at podengo.com (Jeff) Date: Sun, 29 Nov 2015 17:03:52 -0500 Subject: [Hallicrafters] HT-44 Carrier balance drift Message-ID: <565B7648.4010407@podengo.com> Input appreciated: Have a working HT-44 that's getting excellent audio reports and good spectrum views on air. I've aligned the audio phasing for a good circle pattern at 1 KHz. In going through it, I found the 22K 2 watt resistors feeding the balanced modulators to have different values. I replaced both with metal oxide resistors. Voltages on the plates are 80 volts (manual says 60, but also feeding it at 123 VAC.) After a day or two, I checked them and they have been clearly subjected to heat -- paint is now hard to tell what color it was. When I removed the original carbon comps, one of them was also quite toasted looking. There's no evidence of any other component stress however. The 12BH7s are closely matched and test good. Second, and maybe related, I am having difficulty maintaining carrier suppression. At first turn on, the carrier shows quite high- maybe 5-10 watts out at full power (130 watts). removing the cover and adjusting the balance pots will quickly take it back to zero, but as the rig heats, it goes off again. Eventually, it stops "drifting" and I'm able to set it so it stays suppressed. The 22K resistors appear to drop the full B+ to the stated voltages, so I would expect for them to get warm. It bothers me to see them thermally stressed like that though. I suppose I could put in a couple of 5 watt resistors, but that seems like it might just be masking a problem. As I said, the rig is getting excellent reports. I have it slaved to a SX-117 and am successfully using it in transceive configuration, so I don't want to overly tinker with something that's more or less working. It's just that the carrier balance controls are inconvenient to have to tweak. If anybody out there has experience with this rig, let me know. Perhaps it's just the nature of the beast? I do know that my other phasing rigs will hold carrier balance well enough, so I'd be disappointed to hear that this one wont. Jeff WB3JIH

This page last updated 26 Sep 2017.