[Electronic M]

Originally Posted by Reinhard

Thanks for the info. Yes, having recently found out about the museum, I plan to go visit it soon....seems I'm on a nostalgia streak. BTW, I grew up in Milwaukee, and the subject color TV prototype came from a repair shop around the corner from 35th an Oklahoma....don't know how the shop owner came to a have it. It's tough to know closer to the origin that an item will some day be a collectible. However, I'm also a big Tektronix fan, and have a small collection of landmark Tek pieces. I have what is likely one of, if not the last 485 scope produced, in pristine working condition. Got started with the fascination with CRTs when I was 11 and a kid in my grade school gave me a 7JP4, which I was bound and determined to light up, and succeeded, with a train transformer, old radio vibrator, and car ignition coil....just a bright spot in the middle! Unfortunately, again I had to know how the insides of that tube were made, so it came apart as well. I guess those you can still find reasonably on eBay. Does the museum have an electostatic deflection TV with the 7JP4? Would love to see one work!

Cheers!
Reinhard Metz
Wheaton, Il.

They have several. http://www.earlytelevision.org/
You may be able to buy one at the spring convention/swapmeet/auction.

I've got 3 7JP4s and 2 sets that use them. The Motorola VT-71 is the most common set that uses that tube.