The 12AT7 sounds familiar in that multivibrator circuit. Was it built from a
schematic in an older handbook? I have some from that era in my storage unit.
The next time I am there (next week) I can dig one out and look.
73, Mike WA5POK
On Monday, May 15, 2017 10:41 AM, Russ <[email protected]> wrote:
Folks:
Not exactly Elecraft, but I am restoring the HA-1 tube keyer copy that I built
from scratch as a kid in 1970.
The tubes have all lost their markings (and maybe their functionality).
Does anyone have a schematic (or manual)?
Thanks, Russ KD4JO
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