From paul at paulbaldock.com Sun Oct 1 12:26:40 2017 From: paul at paulbaldock.com (Paul Baldock) Date: Sun, 01 Oct 2017 09:26:40 -0700 Subject: [AMRadio] AM/SSB Classic Exchange Today In-Reply-To: <000001d33a0d$4b8660c0$e2932240$@netcom.com> References: <000001d33a0d$4b8660c0$e2932240$@netcom.com> Message-ID: <59d11741.8b93620a.829da.43b1@mx.google.com> I don't hear any activity in the AM/SSB Classic Exchange today? Does anybody? - Paul From ranchorobbo at gmail.com Mon Oct 2 08:33:10 2017 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Mon, 2 Oct 2017 07:33:10 -0500 Subject: [AMRadio] Revisit In-Reply-To: References: <000e01d339ae$cae64e20$60b2ea60$@charter.net> Message-ID: The original sham was the work of one or more hams with influence who had an agenda to get rid of AM because it did not fit their personal ham radio world-view. Rob K5UJ On Sat, Sep 30, 2017 at 7:30 AM, Douglas Burlew wrote: > After re-reading the FCC?s rationale for the change in power measurement for the Amateur Radio Service (graciously > provided by K4KYV) the conclusion is they made a weak argument that has not aged well. So, there may be a glimmer > of hope. From mjcal77 at yahoo.com Thu Oct 5 15:04:06 2017 From: mjcal77 at yahoo.com (CL in NC) Date: Thu, 5 Oct 2017 19:04:06 +0000 (UTC) Subject: [AMRadio] Tube question References: <1872576623.2117102.1507230246151.ref@mail.yahoo.com> Message-ID: <1872576623.2117102.1507230246151@mail.yahoo.com> OK, one of my TX's is a BC375 that uses four VT4C triodes. Thankfully, they are all good, and I have a couple spares. Today, American made NOS run in the hundreds of bucks each, but a place down in FLA is selling them new manufactured, from China I'm guessing , for $125 a pair, not too bad comparatively. Here is my question. I understand that these are highly sought after by audiophiles, but I have not found any HI-FI or stereo amp that uses them. Anybody have a link to where the apparent god of stereo is selling these amps that jack the price for some more noteworthy use, like in my TX? Charlie, W4MEC in NC From ka1kaq at gmail.com Thu Oct 5 17:31:50 2017 From: ka1kaq at gmail.com (Todd, KA1KAQ) Date: Thu, 5 Oct 2017 17:31:50 -0400 Subject: [AMRadio] Tube question In-Reply-To: <1872576623.2117102.1507230246151@mail.yahoo.com> References: <1872576623.2117102.1507230246151.ref@mail.yahoo.com> <1872576623.2117102.1507230246151@mail.yahoo.com> Message-ID: Charlie, there's a bunch of stuff on the internet for VT4C amps. No idea who, if anyone manufactures them but it's a favorite tube for the DIY crowd. Lower powered cousin to the 845, more or less. Here's a youtube video of one such amp using a very early brass based/tipped top version: https://www.youtube.com/watch?v=WeE9xXGrDzU The Asians, Russians, and Chinese really go after the original tubes. If you think 211s are pricey, check 845s sometime. I liquidated my stock of 845s and many GL-211s years back to free up some cash for other projects. Prices were high then (845s were averaging a kilobuck, less if used, 211s $200-$500) which no doubt helped drive the China connection. Never used them but I can tell you that the envelope size is noticeably smaller. Not a lot, but it is noticeable - if that matters. I'd say check around some of the audio sites online and see what folks have to say. From an RF-perspective as well as over-air, make/shape/size shouldn't matter. ~ Todd, KA1KAQ/4 On Thu, Oct 5, 2017 at 3:04 PM, CL in NC via AMRadio < amradio at mailman.qth.net> wrote: > OK, one of my TX's is a BC375 that uses four VT4C triodes. Thankfully, > they are all good, and I have a couple spares. Today, American made NOS > run in the hundreds of bucks each, but a place down in FLA is selling them > new manufactured, from China I'm guessing , for $125 a pair, not too bad > comparatively. Here is my question. I understand that these are highly > sought after by audiophiles, but I have not found any HI-FI or stereo amp > that uses them. Anybody have a link to where the apparent god of stereo is > selling these amps that jack the price for some more noteworthy use, like > in my TX? > > Charlie, W4MEC in NC > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ka1kaq at gmail.com > From k4kyv at charter.net Fri Oct 6 19:10:26 2017 From: k4kyv at charter.net (Donald Chester) Date: Fri, 6 Oct 2017 18:10:26 -0500 Subject: [AMRadio] Tube question In-Reply-To: <1872576623.2117102.1507230246151@mail.yahoo.com> References: <1872576623.2117102.1507230246151.ref@mail.yahoo.com> <1872576623.2117102.1507230246151@mail.yahoo.com> Message-ID: <001601d33ef8$4b919540$e2b4bfc0$@charter.net> > OK, one of my TX's is a BC375 that uses four VT4C triodes. > Thankfully, they are all good, and I have a couple spares. Today, > American made NOS run in the hundreds of bucks each, but a place down > in FLA is selling them new manufactured, from China I'm guessing , for > $125 a pair, not too bad comparatively. Here is my question. I > understand that these are highly sought after by audiophiles, but I > have not found any HI-FI or stereo amp that uses them. Anybody have > a link to where the apparent god of stereo is selling these amps that > jack the price for some more noteworthy use, like in my TX? > > Charlie, W4MEC in NC I use both 845s and 211s in my station, the 845s as audio drivers in two of my transmitters, and the 211 as rf driver in another. Good spares of each on hand, NOT for sale. Eat your hearts out, audiophools. Don k4kyv --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus From commtekman at aol.com Fri Oct 6 19:29:52 2017 From: commtekman at aol.com (commtekman at aol.com) Date: Fri, 6 Oct 2017 19:29:52 -0400 Subject: [AMRadio] Tube question In-Reply-To: <001601d33ef8$4b919540$e2b4bfc0$@charter.net> Message-ID: <15ef40612a3-c0a-4356@webjas-vab082.srv.aolmail.net> I am a silent observer of this forum and am surprised that these large triodes have application in the audio field. I did a fast search in my comm shop and didn't find any 845 but do have a number of the 211 type. I thought I had some that were in military type boxes that were marked V4C but I found them yet. I always enjoy your comments on this forum. Bob K6OSM since 1958 ? ? In a message dated 10/6/2017 4:12:51 PM Pacific Standard Time, k4kyv at charter.net writes: ? > OK, one of my TX's is a BC375 that uses four VT4C triodes. > Thankfully, they are all good, and I have a couple spares. Today, > American made NOS run in the hundreds of bucks each, but a place down > in FLA is selling them new manufactured, from China I'm guessing , for > $125 a pair, not too bad comparatively. Here is my question. I > understand that these are highly sought after by audiophiles, but I > have not found any HI-FI or stereo amp that uses them. Anybody have > a link to where the apparent god of stereo is selling these amps that > jack the price for some more noteworthy use, like in my TX? > > Charlie, W4MEC in NC I use both 845s and 211s in my station, the 845s as audio drivers in two of my transmitters, and the 211 as rf driver in another. Good spares of each on hand, NOT for sale. Eat your hearts out, audiophools. Don k4kyv --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Archives: http://mailman.qth.net/pipermail/amradio/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio at mailman.qth.net To unsubscribe, send an email to amradio-request at mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to commtekman at aol.com From k9cox at charter.net Sat Oct 7 02:55:22 2017 From: k9cox at charter.net (Ross Stenberg) Date: Sat, 7 Oct 2017 01:55:22 -0500 Subject: [AMRadio] Tube question In-Reply-To: <15ef40612a3-c0a-4356@webjas-vab082.srv.aolmail.net> References: <001601d33ef8$4b919540$e2b4bfc0$@charter.net> <15ef40612a3-c0a-4356@webjas-vab082.srv.aolmail.net> Message-ID: On the high end they really like 833 amps. 73 Ross K9COX Sent from Mail for Windows 10 From: K6OSM via AMRadio Sent: Friday, October 6, 2017 6:32 PM To: k4kyv at charter.net; amradio at mailman.qth.net Subject: Re: [AMRadio] Tube question I am a silent observer of this forum and am surprised that these large triodes have application in the audio field. I did a fast search in my comm shop and didn't find any 845 but do have a number of the 211 type. I thought I had some that were in military type boxes that were marked V4C but I found them yet. I always enjoy your comments on this forum. Bob K6OSM since 1958 ? From mjcal77 at yahoo.com Sat Oct 7 09:29:31 2017 From: mjcal77 at yahoo.com (CL in NC) Date: Sat, 7 Oct 2017 13:29:31 +0000 (UTC) Subject: [AMRadio] Old Time Bookstore References: <1106425403.3116622.1507382971377.ref@mail.yahoo.com> Message-ID: <1106425403.3116622.1507382971377@mail.yahoo.com> I know a couple folks have interest in actual hard copies of stuff, and YOTB is now up to 75% off everything. Lots of old reprint stuff, including ham and radio in general. If you were ever intrigued by the 'Impoverished Radio Experimenter' series, now's your chance. Yes, a lot of this is probably on the internet for free, but save your printer ink. www.youroldtimebookstore.com Think gas is bad? If your ink cartridge holds 1 oz and costs you $20, that's like $2500 bucks a gallon. Charlie in NC From k4kyv at charter.net Sat Oct 7 16:15:56 2017 From: k4kyv at charter.net (Donald Chester) Date: Sat, 7 Oct 2017 15:15:56 -0500 Subject: [AMRadio] Tube question In-Reply-To: <15ef40612a3-c0a-4356@webjas-vab082.srv.aolmail.net> References: <001601d33ef8$4b919540$e2b4bfc0$@charter.net> <15ef40612a3-c0a-4356@webjas-vab082.srv.aolmail.net> Message-ID: <001c01d33fa9$15b62d80$41228880$@charter.net> The 845 has always been primarily an audio tube. The RCA manual even says they are not recommended for RF use. One of the earlier uses dating back to the 1920s was as class-A single ended modulators using the Heising ?constant-current? configuration. When Loy Barton came up with the Class-B modulator idea circa 1930, 845s were found to make excellent audio drivers because their relatively low internal plate resistance worked well with the widely varying grid impedance of the modulator tubes over the audio cycle. Class A 845s also make good amplifiers to drive hi-fi loudspeakers, since speaker impedance also varies widely, with frequency. Whether as class-B drivers or speaker amplifiers, the 845 provides a well-regulated source of audio driver voltage, minimising distortion as the load varies over the audio cycle. The 211 also works for this purpose, but not as well as the 845. I am a silent observer of this forum and am surprised that these large triodes have application in the audio field. I did a fast search in my comm shop and didn't find any 845 but do have a number of the 211 type. I thought I had some that were in military type boxes that were marked V4C but I found them yet. I always enjoy your comments on this forum. Bob K6OSM since 1958 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus From commtekman at aol.com Sun Oct 8 15:36:01 2017 From: commtekman at aol.com (commtekman at aol.com) Date: Sun, 8 Oct 2017 15:36:01 -0400 Subject: [AMRadio] Tube question In-Reply-To: Message-ID: <15efd7cb192-c0a-186f6@webjas-vaa126.srv.aolmail.net> I have a couple of UV204-A tubes, I bet they would be just wonderful for that big sound system-sealed Bob K6OSM ? ? ? In a message dated 10/6/2017 11:56:11 PM Pacific Standard Time, k9cox at charter.net writes: ? On the high end they really like 833 amps. 73 Ross K9COX Sent from Mail for Windows 10 From: K6OSM via AMRadio Sent: Friday, October 6, 2017 6:32 PM To: k4kyv at charter.net; amradio at mailman.qth.net Subject: Re: [AMRadio] Tube question I am a silent observer of this forum and am surprised that these large triodes have application in the audio field. I did a fast search in my comm shop and didn't find any 845 but do have a number of the 211 type. I thought I had some that were in military type boxes that were marked V4C but I found them yet. I always enjoy your comments on this forum. Bob K6OSM since 1958 ? ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Archives: http://mailman.qth.net/pipermail/amradio/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio at mailman.qth.net To unsubscribe, send an email to amradio-request at mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to commtekman at aol.com From w5jo at brightok.net Sun Oct 8 18:56:37 2017 From: w5jo at brightok.net (w5jo at brightok.net) Date: Sun, 8 Oct 2017 17:56:37 -0500 Subject: [AMRadio] To those who can attend Message-ID: <800450246CF14863A97D1D9BCF1A3C11@JimPC> Texoma Hamarama - 70th Anniversary ! www.texomahamarama.org Ardmore, Oklahoma Convention Center October 27 - 28. 2017 Mail in Pre-Registration closes October 20th, 2017 Online Pre-Registration closes October 25, 2017 Onsite registration throughout event Very nice Facility, Wide aisles Lots of Parking, Near Lake Murray and Turner Falls Overnight Accommodations onsite and close by venue Scholarship applications should be postmarked by October 20, 2017 Vendors, Flea-market, Forums, Food Trucks, Bingo, Kids Room Ham Radio Prizes, Ladies? Prizes, Children?s Prizes, Bingo Prizes Scholarship Award From jayw5jay at gmail.com Mon Oct 9 03:23:19 2017 From: jayw5jay at gmail.com (Jay Bromley) Date: Mon, 9 Oct 2017 02:23:19 -0500 Subject: [AMRadio] Wanted Heathkit DX-60 manual Message-ID: Hi Guys, I am wondering if anyone has an original DX-60 manual they might consider getting rid of? I know they are some on line, but the text and schematics are hard to read at times. I am not sure of the differences in the DX-60 and the DX-60B, but my DX-60 has the green meter bezel. With some of these rigs being parted out I am hoping that someone may have an extra manual they no longer need? Thank you 73 de w5jay/jay.. w5jay at arrl.net From w5jo at brightok.net Mon Oct 9 17:03:56 2017 From: w5jo at brightok.net (w5jo at brightok.net) Date: Mon, 9 Oct 2017 16:03:56 -0500 Subject: [AMRadio] Gov. Publishing service Message-ID: Some of you guys like to read the rules and regulations. Here is a site that will allow you to peruse Title 47 which contains Telecommunications and other services. https://www.gpo.gov/fdsys/pkg/CFR-2001-title42-vol1/content-detail.html Have fun reading. Jim W5JO

This page last updated 20 Oct 2017.