20B2 Power Supply - not mine

[HarrySmith]

Someone here was looking for a power supply recently. I do not recall who but there is one on eBay now. Asking $39.99 but taking offers with free shipping! Shipping is usually high since they are so heavy. If you don't get it I will!

https://www.ebay.com/itm/Vintage-Western-Electric-20B2-Power-Unit-Bell-System-RARE/203024445918

[RB]

I have seen those on ebay.
what were they originally used for?

[HarrySmith]

IIRC they are for powering switchboards.

[RB]

Ah, ok. Never seen one connected...

[Babybearjs]

they do more than switchboards! mine runs my 1A1 phone system and the 18VAC line also runs the relays on a electric fireplace and windows air conditioner... Plus, the secondary 10 Volt line is used for my homes doorbell circuit! so, hows that for versatility?

[RB]

I like that!

[Babybearjs]

yeh, and the whole house is wired with 25 pair cabling!