The 1A2 systems are before my time, however I own a model 464 and a 564 phone. I keep and collect some of the old stuff I run across. I recently have been thinking about this stuff more (thanks to the posts by rotary500 and the responses by Ed and Bill). I am pretty sure I own a power supply unit that was used for this (it has 24vdc and multiple 10vac outputs on it with flat bakelite fuses). I have never seen the actual KSU though. Just wonder if someone has found a picture on the net (I did a search, but didn't find any pics of the "shoebox"). Also what is the difference between 1A1 and 1A2? If I found a KSU, would the two phones that I own be compatible or were there differences other than the physical looks?
