Step 2: see what it can do.

A project log for Modernizing a 1960s Intercom

So you've bought a house with an old intercom. Trash it? No way! Make it useful again.

Jorj BauerJorj Bauer 01/11/2016 at 22:020 Comments

Schematics for the 2561 (which was also the 2562, apparently, if you added a couple optional circuits) are easy enough to find online. Pair those with the "okay what is this RCA jack on the bottom for?" and you've got an answer: the RCA input was designed for a preamplified input.

So if we want to use that input, it's time to add an amplifier.