Hi Jeff.

Option 1.  As you suggest, so check with Mr_RTTY for the connector part number 152466.  I use that method on my test bench for both the keyboard and the printer. 

Option 2.  Wire straight to the terminal screws on the selector magnet coils.  Be sure you get the polarity right.

Option 3.  Get 2893WD (https://www.navy-radio.com/manuals/tty/wd/2893WD-6601.pdf) and see how the LESU is wired without a polar relay option.  That's the way I've approached it on a couple of machines.  You can have the keyboard and SM in series as the WD shows, or you have the option of separating them at the C terminal strip (C6,7 & 8,9?).

This option will require up ending the LESU to get access to the terminal strips.  Not a fun job, but once done you will probably won't ever have to do it again. The 120 VDC power supply could also be removed along with the polar relay module.  I think another option for the PS is having the 120 VDC available at the C terminals, if you thought it useful.  I'd have to go back to some documentation, but I kind of recall 20 and 21 might be where you'd normally see it connected.

---
----
You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 7/7/2022 12:46 PM, w1aea wrote:

Hi all 

Working on a Model 28 machine, That uses a Polar Relay, I'd like to bypass all that Wizardry and wire the selector magnets straight into my 60ma. Loop. To do this I'm looking for the socket that mates the Selector coil plug! It's called "automatic typer plug" in the manual I have,  20pins  female anyone have one in the spare parts box! If so let me know please, 

Thanks   jeff W1AEA

Sent from my Galaxy Tab® A

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