[GreenKeys] M28 using 20ma

[Harold Hallikainen]

> The M14 & 15 TTYs were designed to replace Morse keys on telegraph land
> lines, so were designed for the same 60 ma, 120V supplies that the
> telegraphs used. You needed high voltage and substantial current to get
> through all the reactance of 10-20 miles of land lines.

My long ago experience with model 15 and 14 (typing reperf) was that they
were available with either pulling or holding magnets. Pulling magnets
were in series for 60 mA. Holding magnets were in parallel for 60 mA and
series for 20 mA.

Do I remember 50 years ago right? And, of course, this is not model 28,
which I've never worked with.

Harold


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