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#61
02-22-2005, 11:02 PM
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Charlie,
Organization skills are lacking here also. All the tubes in the Olympic are good. Only had to replace A 6AQ5 and a tuner tube. Too late to attempt to power it up. The CRT is perfect! polaraman 
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#62
02-23-2005, 01:12 AM
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Tiny CRT
Guys,
One of the items I brought home during our adventure the other day is a tiny little crt. It's a 902A. As you can see, it's pretty small. Only about 7 inches long, and the screen is roughly 1 3/4 inches in diameter. Did these have a specific use? Or can this be used as a test crt? I couldn't find any info on this number in my tube book, so, I don't know what voltage the heaters run on. Suggestions?
__________________
Charlie Trahan He who dies with the most toys still dies.
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#63
02-23-2005, 01:31 AM
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I'm so darn jealous.
 You guys are just having too much fun rooting through that old shop, wish I could be there.
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#64
02-23-2005, 06:16 AM
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Yeah - I agree with Eric - I wish I could be there too. Nice scores!
Charlie - that has to be the most adorable little CRT I've ever seen! I have no idea what it could have been used for though, maybe it had some application as a camera viewfinder, or possibly some sort of test equipment? Could be a sample too, or some sort of promotional thing, but somehow I doubt it. I know I have seen pictures of CRT's made out of coke bottles though - from what I've read the coke bottle CRT's were made as curiosities for tours at picture tube plants and the like. Yeah, you guys are having too much fun. Way too much fun. I wish there was some fun like that in my neck of the woods. Some people have all the luck - I'm still hunting the elusive color roundie. Sssh! Be vewy vewy qwuiet - I'm hunting wowndies.  Good luck on your restorations guys! -Ian
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#65
02-23-2005, 06:17 AM
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Looks like an electrostatic crt for a little oscilloscope....fil is probably 6.3 volts but have not double checked it. You can hook up a filament transformer to a variac and boost the voltage slowly from zero and note how the glow appears as you monitor the voltage.
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#66
02-23-2005, 08:19 AM
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Quote:
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#67
02-23-2005, 08:31 AM
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My CRT book sez its a 902, introduced in 1938,was 1st used in the RCA Model 151-2 oscilloscope. National Union also made 'em for the Navy during WW2. Doesn't have any info on voltages, except it would work down to 400 volts. You may have an oldie but a goodie...-Sandy G.
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Benevolent Despot
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#69
02-23-2005, 01:20 PM
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There was (is?) someone selling a similar small tube on ePay.....except his had numbers painted on the face like a clock and there was a single clock hand that apparently could be set by hand. He didn't know what the application was, most strange! I wonder if it was either used in a lab or perhaps radar setup. Anyone recall that auction?
Anthony
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#71
02-23-2005, 05:38 PM
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Thanks for the info guys. Sounds like this tube has limited uses. I can either get an old oscilloscope for it (yeah right), or I can put it on a shelf for something interesting to look at. It seems that I'll be doing the latter of the two.
I did find a couple of sites that sell these on the web. Looks like they go for about 50 bucks. Probably cheaper on ebay. Oh well. I'm just gonna use it for looks. 
__________________
Charlie Trahan He who dies with the most toys still dies.
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#72
02-23-2005, 05:54 PM
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902a
Some 902A screen caps here:
http://www.tvontheporch.com/
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#73
02-23-2005, 06:03 PM
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speaking of crt's the 9" tube you sent me arrived safely.
havnt gotten around to testing it but the getter is silver. you still havent told me what i owe you.
__________________
i collect and restore vintage radio's,tv's,and ham gear. email for more info
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#74
02-23-2005, 06:12 PM
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Quote:
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Charlie Trahan He who dies with the most toys still dies.
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Someone's bragging!!!!
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