In case you happen to be orienting a Porsche 944’s brake caliper pistons, a triangle with a 20 degree angle is helpful. I used Wolfram Alpha to make one, since I was too lazy to find either a ruler or a protractor.
The cutout should face into the rotor’s rotation. That means, for the front brakes, it should face to floor. The consequences for screwing it up are slightly faster wearing pads.
I’m not sure what this big blue fellow is. It had four leads coming out of the base and claimed that its case was negative. Big cap? Vacuum tube? It is between the part that I think is an amp and the part that steps down and converts the AC to DC.
The transformers above the blue fellow are the parts that weathered time the worst. The rest of it was in pretty spotless condition. Must not have been in a smoking office, which is a little hard to believe if it is as old as I think.
I am pretty sure the little three legged fellow is a transistor. It is, as far as I could see, the only one in the whole unit.
Another interesting thing about these intercoms is that they don’t have separate microphones. Pressing the switch just changes the circuit the speaker is on, which allows it to work as a microphone.
Look who is the proud owner of a Talk-A-Phone intercom system. It is really lovely in sort of a brushed metal future 70’s kind of way. I’ll have to get some wire to hook them all together, but my initial tests seem to indicate that they work. I’ll need longer wires to avoid the terrible feedback squeal
No instruction manuals, but the bottoms have some diagrams with guidance for what wire goes where, so hopefully these are as easy to operate as they appear. I’m pretty sure they are literally a speaker and a microphone with a switch. The main unit has an amp and more switches. Looks like it’s time to buy some wire and a bunch of spade terminals!
I’ll post some shots of the bottoms and my wiring results when I know more.
The guy at state surplus thought they looked like something off Magnum PI, and he’s not wrong.
We’re coming up on the dang record temp for the day. Mid 40’s and sunny, I
can’t believe it’s January! I’m happy to experience the mild weather and
all, but I feel like this bodes poorly