[GreenKeys] M19 Table in a Box

[John Spigel]

It's good to see all here that value the ingenuity and creativity of the 
past, and more importantly, enjoy it, and share. I'm new to this list 
after very recently reintroducing myself to the TTY world. My first 
experience was long ago in the mid 1960's with an M15. In the late 
1970's I dragged home from my workplace a fully loaded ASR33 with the 
embedded phone modem, along with boxes of paper and tape. It had been 
abandoned in place by NJ-Bell. I did not start to work with it until a 
couple years later, after a move, building a homebrew solid state TU 
unit. Then, little did I know, hams were only working with 5-bit. At the 
time there were few home computers or a foreseeable need, so sadly and 
to create space, the machine went to the curb.

So this year after almost 40, I picked up some pieces and parts thanks 
to Bob K1QVX and Jim W2JC to recreate/relive/cherish the past and 
restore to life a M19 and M15 pair. I'm still scrounging for parts, but 
have made good progress in the last month or so. My M15 has been cleanud 
up, is printing and is waiting for proper lube and a few keytops. The 
cabinet will need some paint, glass, etc. My M19 table has been scraped 
of loose rust, spot sanded and Por-15 primed and painted. The Thyratron 
P.S. unit sits under a work bench for now and will need some careful 
study on its needs. I've built up what I call a "Table in a Box" to 
provide loop and DC needed for bench repair for the M19 printer, KB and 
punch. There's no room in the barn for the full table!  The box could be 
used in place of the full P.S. if needed! I have some progress pictures 
on a webpage.

https://w1an.com/tty-project

The unit uses a conventional full wave bridge with choke input 
filtering, a 10 ohm series resistor for monitoring the loop current and 
receptacles for the printer and punch DC. (I have some extra Nema 
receptacles if someone needs them.)

Hope this is of interest!
73, John W1AN
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20231207/3e0bd689/attachment.html>