401A KTU

[PAULC978]

I am restoring a WE 551A KSU. The BSP calls for a 401A KTU for a manual intercom. I'm unable to find them.
Is a 401B compatible? Sorry I'm new to this. Thank you.

[poplar1]

401B will work.The 401-type cards were used with "buttons and buzzers" for a manual intercom.

[5415551212]

Might I suggest a Tone Commander, Melco or other dial intercom
they can be picked up on ebay for under $100
Here is one on ebay now:
https://www.ebay.com/itm/175590585744
then you can dial your extensions.

You can actually run intercom on more than one line, so have fun.

You also can connect non-key phones to the intercom, or the key system in general, but it takes some custom wiring.

Here is a video on them
https://www.youtube.com/watch?v=PCuX-3d7Rvo

Cheers
--Stephen

[PAULC978]

Thank you for the quick reply.