This cute little Northern Radio portable TTY test set showed up at the AWA Museum last week. I have not been able to find anything on the Internet about it.

It has five TO-5 type ICs (only one I can read is "CD4004", no date code) and one 24 pin ceramic DIP with xtal time base.

I powered it on, but it didn't do much. But I am not sure I understand how to hook it up and without a manual, don't want to damage it. Strange that it does not have a speed/baud rate control.

Does anyone know anything about it?

Thanks,

Duncan
K2OEQ