I used a HA-1 keyer during the early 1960's. However, it was not the
first successful commercial electronic keyer!
It was my third keyer. My first keyer was the "Mon Key," which did not
have self-completing code elements, and my second was a Eldico, which
was self-completing. Both these earlier keyers had built in paddles.
73, Chuck NI0C
On 3/03/2018, Kent Trimble wrote:
I did a Show-N-Tell with our club’s CW class last Saturday using my
46-year old Hallicrafters T.O. Keyer so they could operate the first
successful commercial electronic keyer, and to underscore how viable
vintage tube gear still can be."
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