Home » The Computer-free Automation of a Jukebox (Electromechanics) technology automation

The Computer-free Automation of a Jukebox (Electromechanics) technology automation

by Langsongshipin123



Ever wonder how we made all these crazy machines do all their crazy machine things before computers came along? Wonder no more as we explore the inner workings of a Wurlitzer 3400 series jukebox from 1970!

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40 comments

Technology Connections 14/09/2021 - 2:45 PM

Those of you with eagle eyes will have noticed that the transfer switch is a double-pole switch. This added to the messiness of the "red button" analogy so… I ignored that bit of nuance! Yeah. Pretend it's a red button just like in the demo. But that gets pressed when it's let go. Easy, right?

Seriously, I can't say I'm happy with how I explained that. So here's a (perhaps) better after-the-fact clarification;

The Wurlamatic (main cam) really has two red buttons and two green buttons. The side 1/2 relays are the first green button. The transfer switch is the first red button. When the machine is at rest, the red button is still being held in and the side 1/2 relays need to get around that to start it moving. Once that happens then the red button is "let go".

The play switch is the second red button which stops the program mid-run. Then the trip switch becomes a second green button, which re-starts the program. Finally, when the machine is back to the starting point, the transfer switch is released and therefore the original "red button" is pressed to shut it down.

Hope that helps!

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Zoë MacGregor 14/09/2021 - 2:45 PM

I can't believe I didn't notice the jukebox video until now

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R.A.T.7 14/09/2021 - 2:45 PM

2:30 Missed rickroll…tisk tisk tisk

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Bruno Leite 14/09/2021 - 2:45 PM

What's the name of the green record?

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Erick Kinnee 14/09/2021 - 2:45 PM

The Statesman is what I recall being in Waffle House restaurants .

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ibengmainee 14/09/2021 - 2:45 PM

As a former bowling pinsetter mechanic. Using cams and cam followers is exactly how pinsetters, built before roughly 1990, work. Brunswick Model A (1955-1963) and A-2 (1963-1985) pinsetters have an assembly called a detector. The assembly is 100% mechanical and is effectively the "brains" of the entire machine. Through a series of cam and lever, that pinsetter is able to mechanically determine if you bowled a strike, left pins standing, if a pin slid out of place without falling over (called an out of range) and was able to perform the correct cycle based on the "input" you gave the machine. Though the same cams, the machine knows if it's your first throw, or second throw. The lower the deck assembly to detection height or to lower it all the way to set new pins, when to sweep the rake to clear out pins and a many more functions that bowlers do not get to see. It is really incredible what you can do with just electromechanics.

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Trace Legacy 14/09/2021 - 2:45 PM

What was the M3 song? That was a vibe

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Prasad Indi 14/09/2021 - 2:45 PM

Seeing this, can't imagine how Alan Turing's machine was designed, manufactured and worked.

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Mittens FastPaw 14/09/2021 - 2:45 PM

Ugly but he has one…

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Khizar Laique 14/09/2021 - 2:45 PM

The First Computers were also Mechanical. BRUHH……………….

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Stephen Harris 14/09/2021 - 2:45 PM

Hi there, really enjoyed the videos on the 3400. I have a Seeburg LPC1R and a AY160. I’m going to be helping a friend who has a 3400 and I was wondering if you had a copy of the 3400 service manual on PDF that you’d be willing to send me? Feel feee to message me for my email address. Thanks so much! Great information. 🙂

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Troll McClure 14/09/2021 - 2:45 PM

that machine had to be expensive AF

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Ikee Kaii 14/09/2021 - 2:45 PM

Lmao the best fucking part is when you said "it'll sort of pause it, ironic for a switch named play" and your face 🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣❤️❤️❤️❤️❤️❤️

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Manzabhad Mann 14/09/2021 - 2:45 PM

Man… people smoked a lot of cigarettes in the 70's – look at all that brown!

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Tony Barban 14/09/2021 - 2:45 PM

After watching this, I went in search of how the telephone electro-mechanical switching worked. Turns out it was much simpler to call someone than to play a song on the jukebox.

I remember as a kid tapping out telephone numbers on the hang up button and thinking how clever I was…

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billyum braskey 14/09/2021 - 2:45 PM

outspoken fan of the color contextual orange *

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Rob Friedrich 14/09/2021 - 2:45 PM Reply
shane thede 14/09/2021 - 2:45 PM

I love all the Disney shirts.

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Elijah Aitaok 14/09/2021 - 2:45 PM

Never mind steam, diesel, and/or cyberpunk. We need electromechanicalpunk

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Justin T 14/09/2021 - 2:45 PM

The electromechanic switch is simple. The genius and magic is making tens, hundreds or thousands of them work together, in differing sequences.

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Rufus Connolly 14/09/2021 - 2:45 PM

I thought I clicked a Technology Connections video, how did I end up in Computer Science 101?

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P 14/09/2021 - 2:45 PM

The fact that I didn't get rick-rolled with that green record astounds me.

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Sam O 14/09/2021 - 2:45 PM

It's kind of ironic, and fascinating, that people build electromechanical devices inside a computer, using minecraft.

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Jake Jake 14/09/2021 - 2:45 PM

I died laughing when 19 was dropped

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Jon W 14/09/2021 - 2:45 PM

Lost it at "19!!"

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sam1174 14/09/2021 - 2:45 PM

I'm so pissed that you didn't let me hear Tarzan Boy.

ALEXA! PLAY TARZAN BOY BY BALTIMORA!

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Phi Tsf 14/09/2021 - 2:45 PM

I have a start stop switch from a drill press, the wiring confused me. "Latching interrupt" – i learned today!!!!

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That Sodding Gamer 14/09/2021 - 2:45 PM

Reminds me of Minecraft TBH. Redstone, Redstone Torch, Repeaters, Buttons, switches, etc. You can make some complicated stuff in Minecraft. It basically lets you make electromechanical systems as mentioned in this video. I never made anything fancy (I'm not really good at complicated stuff like some Minecrafters), but it was fun coming up with things like time delayed traps, airlocks, secret passages, and so on.

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Christian Daniel 14/09/2021 - 2:45 PM

All of these techniques are invaluable for certain types of gamer (Factorio, Satisfactory, etc.).

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Jay Finke 14/09/2021 - 2:45 PM

The Florida pool pump motor bearing repair guy approved ! that was good info

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Jay Finke 14/09/2021 - 2:45 PM

The Florida pool pump motor bearing repair guy approved ! that was good info

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Mason Jones 14/09/2021 - 2:45 PM

I bet you could make some gnarly minecraft logic gates I'm an adult but you wouldn't believe what you can do with Redstone lol

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Mason Jones 14/09/2021 - 2:45 PM

Analog is beautiful

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Mason Jones 14/09/2021 - 2:45 PM

It would be a wurlitzer very good brand

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Alicia Ann 14/09/2021 - 2:45 PM

Tarzan Boy! 😜😂

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John Moore 14/09/2021 - 2:45 PM

A switch is a logic gate. With a small bit of effort, you can build control circuitry using zero ic's, and even no vacuum tubed.

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Idelacio 14/09/2021 - 2:45 PM

"From the Teenage Mutant Ninja Turtles soundtrack"

Heh, specifically the third movie if memory serves. :3

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The Lord of Celestial Fire 14/09/2021 - 2:45 PM

The more you think about it, it is oddly like vanilla Minecraft redstone.

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Jared Bingham 14/09/2021 - 2:45 PM

Tarzan boy by Baltimore lol! Or by cool mint Listerine.

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CSelH 14/09/2021 - 2:45 PM

I'm a year late, but what about a Wurlitzer Electric Piano? Tall order I know, but I'd loved to see how in the world that was done.

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