Vacuum Tube Etch-A-Sketch

It says "Flikr" here!

ahhh.... I see.... flickr meiosis goes analog

precisely!

Flatscreen TV or window? If window, what's the view?

hey, it looks like weed...

Random Pre-Silicon Ingredients:

Tektronix Type 564B Storage Oscilloscope with Plug-In Type 365 Spectrum Analyzer and Type 3A9 Differential Amp

Tektronix 148-M Insertion Test Signal Analyzer

HP 191A TV Waveform Oscilloscope

Tektronix 520A NTSC Vectorscope

Blinking Red Light

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Comments

ranjit says:

ooh, shiny shiny gadgets!

how does it work??
Posted 42 months ago. ( permalink )

AMagill says:

Ooooooohhhh...

On another note, I've always wondered.. how the heck did storage o-scopes work before we had solid state storage?
Posted 42 months ago. ( permalink )

jurvetson says:

I was wondering the exact same thing. Here's a piece of vintage electronics with a screen and a handful of vacuum tubes. No transistors or memory chips. So how does it "remember" the trace on the screen to show it persistently? From a bitmap perspective on the screen, there is a lot of data to be retained...

The answer is fascinating. Memory is implemented in the display screen itself with a separate tracing beam reading the phosphors and regenerating them with the write beam (Wikipedia details). It reminds me of early computer memory systems that stored data on the phosphor of a CRT…. (giving “Video RAM” a literal instantiation =)

Ranjit: so now that we know how an image can stay on screen, to make an Etch-a-Sketch, you dial the beam down to a point or small bar, and use the vertical and horizontal adjustment knobs to paint with light. It has all the limitations of the original toy (you can’t lift the “pen”) but it does have half-screen erase options…

This is an alpha-stage product, so the flicker on the screen is missing a couple letters. Today, flickr is in gamma, so it's just missing one letter.... ;-)
Posted 42 months ago. ( permalink )

TheAlieness GiselaGiardino²³ says:

oh, so it did mean to say "flickr" there?! I thought it was pareidolia...

the commands below the screen must have influenced me too -i thought-... those buttons... so flickristic.
Posted 42 months ago. ( permalink )

Telstar Logistics says:

Love this. The perisistence thing is very pronounced on my new old HP o-scope as well. Tracers!
Posted 41 months ago. ( permalink )

Mo, In The 415 says:

...Or Something! I can't wait to show this to a few friends who are always in search of the newer/smaller/faster electronic thing-a-ma-bob. Can't wait for the *cringe*.
Posted 41 months ago. ( permalink )

See you @ http://www.ipernity.com/doc/ypell ypell [deleted] says:

Oh, fun!
Posted 39 months ago. ( permalink )

Omsel says:

You're invited to post this image to Red or Yellow or Green Group
Posted 39 months ago. ( permalink )

lilith penguin says:

Geek heaven!

--
Seen in Scientist Photographers (?)
Posted 39 months ago. ( permalink )

Boiling Sand says:

Hi, I'm an admin for a group called Measuring Devices, and we'd love to have your photo added to the group.
Posted 25 months ago. ( permalink )

realblades says:

Wow
Posted 25 months ago. ( permalink )

DodogoeSLR says:

very cool

1-2-3
Posted 22 months ago. ( permalink )

Another Partial Success says:

Lordy - been a while since I've seem of those bits of kit.

Great fun and a trip down memory lane!

I found this photo in 1-2-3

jon
Posted 22 months ago. ( permalink )

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Taken with a Panasonic DMC-FX7.
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Taken on July 24, 2006
Viewed 5,299 times

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