RE: [AMRadio] Mfg date for 4-400 series
Hi Barrie... In your HB-3, where exactly is the 4-400 data located? I found mine in the Transmitting volume and the other 4-tubes in last volume of the original set. I was also surprised to find only one (1) sheet of data. Is this consistent with your HB-3? Thanks, Rick/K5IZ I have an HB-3 here that shows a data sheet for the 4-400A dated 9-62. I also have an Eimac catalog from the early 1950s that shows the 4-400. 73, Barrie, W7ALW __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Mfg date for 4-400 series
Rick: Not too far into the transmitting volume I find the 4-65, which has 5 pages. (Built a push-pull pair of these for 6M in the middle 1950s) Next is the 4-125A, with 3 pages. Next is the 4-250A, with 3 pages. Next is the 4-400A, with one page. Then comes the 4X500A, followed by the 4-1000A, which has three pages. I have five volumes of the HB-3. I have this particular book out at the moment because I've been helping a local ham with a 160M 813 project. 73, Barrie, W7ALW Hi Barrie... In your HB-3, where exactly is the 4-400 data located? I found mine in the Transmitting volume and the other 4-tubes in last volume of the original set. I was also surprised to find only one (1) sheet of data. Is this consistent with your HB-3? Thanks, Rick/K5IZ I have an HB-3 here that shows a data sheet for the 4-400A dated 9-62. I also have an Eimac catalog from the early 1950s that shows the 4-400. 73, Barrie, W7ALW __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
RE: [AMRadio] Mfg date for 4-400 series
Thanks Barrie, that's just the info I was looking for. 73, Rick/K5IZ Rick: Not too far into the transmitting volume I find the 4-65, which has 5 pages. (Built a push-pull pair of these for 6M in the middle 1950s) Next is the 4-125A, with 3 pages. Next is the 4-250A, with 3 pages. Next is the 4-400A, with one page. Then comes the 4X500A, followed by the 4-1000A, which has three pages. I have five volumes of the HB-3. I have this particular book out at the moment because I've been helping a local ham with a 160M 813 project. 73, Barrie, W7ALW __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
Re: [AMRadio] Mfg date for 4-400 series
On Fri, 23 Mar 2007, Bob wrote: According to the info that I have, they were in production in 1950. They were not listed in the 1948 data sheets. So it could be between 1948 and 1950. Hope this helps. Actually, this deepens the Mystery - both my HB3s reach from the late 30s to the early 60s... they were updated by subscription, so it depended on who had them as to exactly which updates got posted. I have a 1962 TT5 that goes directly from 4-250A to 4-1000, as do the HB-3 sets. I am lacking RCA transmitting tube data from 1963 - 1971. The 4-400 does appear in the 1972 TT5 manual. So: if they were made starting in 1950 - why are they not in the data books until nearly 15 years later..? I'm sure there's a fine answer out there, somewhere just one of those trivial pusuits to distract one from the day's Business.. ;} Cheers John KB6SCO DM09fg __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
RE: [AMRadio] Mfg date for 4-400 series
Data Point: The first mention, in QST, in April 1957 -- A 4-400A amp.. 73, Larry KQ4BY __ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
