Weren't the "TO" keyers popular in those days? I believe it was so popular
that
Hallicrafters made them for a while.


That's my thought - but alas I don't have an old Halli to compare to. But
I don't recall the Hallicrafters having the balance and bias controls - or
the 6AS7 (BIG tube) for output. Seems to me they used a small relay??

Have since tried this on a rig and it works great! REALLY fun keyer to
use and neat to look at! I'll have to hunt down some old Handbooks and
see if it's maybe one of the early TO keyer designs.

What years did they do those?