Probably the All-Electronic Ultimatic. Kaye, John W6SRY QST April 1955 p 11 and QST May 1955 P 36. Four 12AU7 and four 12AT7. Built on a 4x4x3 base.
David K0LUM On Jul 4, 2014, at 5:48 PM, Fred Jensen <k6...@foothill.net> wrote: > I knew there was a history to this. Related question: About the end of > 1956, I and a couple of my teen friends built "electronic keyers" from some > magazine article which is long gone from my memory. I remember they had 8 or > so dual triodes [12AT7's/12AU7's ??], had self-completing dots and dashes, > and nothing else. With the power supply, mine weighed about a small brick > and was similar in size. Used a relay for the then-ubiquitous cathode keying. > We modified our bugs to key them. > > I'm fairly certain the design pre-dated the TO-Keyer, I think the TO came > about 10 years later, and as I recall used fewer tubes. If any OT's remember > the 50's well enough to identify my keyer, I'd appreciate hearing from you. > I had an opportunity to operate as HS1FJ for a few weeks in the mid-60's, Dad > sent me my keyer and Lionel J-36, and when we went back to war, I never saw > either of them again. > > 73, > > Fred K6DGW > - Northern California Contest Club > - CU in the 2014 Cal QSO Party 4-5 Oct 2014 > - www.cqp.org > > On 7/4/2014 12:49 PM, Joe Subich, W4TV wrote: > >>> For that matter, why are there two Iambic modes in the first place? >> >> The original "Curtis" Iambic mode completed the element (dot or dash) >> being sent when [both] paddles were released at the same time. The >> iambic mode in the AccuKeyer had a logic error - the element memories >> were set as soon as the previous element completed - that completed the >> element being sent and then sent the *opposite* element if both paddles >> were released at the same time. This became known as Iambic B to >> distinguish it from the original Curtis iambic (Iambic A) mode. > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to radio...@mchsi.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
