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#1
02-07-2011, 10:34 PM
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Rca 914 crt
I was helping a buddy organize one of his goodie piles, and we found a big, beautiful RCA CRT, type 914. It looks like the design is prewar - big pin base, electrostatic with the four plate caps out the sides - but his was clearly made after World War 2, probably late 40s. It looks to be 9 inches or so, and either P1 or P4.
A tag on the box says "for 305 scope". Scope? That is a damn big tube for scope. I know RCA made a few scopes with 7 inch tubes, primarily for schools, but I have never seen a scope with a 9 inch tube. So, I am thinking this 914 was made for television use. Does anyone know of any TVs that use this oddball? -- Will 
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#2
02-07-2011, 11:41 PM
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For sure a scope tube with green phosphor. I think that some very large scopes were made for classroom demos.
This site has data sheets: http://frank.pocnet.net/index.html 914 Data: http://frank.pocnet.net/sheets/049/9/914A.pdf nice find, jr
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#3
02-08-2011, 07:26 AM
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Here's the scope the 914 is used in:
 RCA Model is TMV-168, also as Model 305. I don't have the data sheet handy, but I believe this weighed over 100lbs. Have been looking for one for a number of years, only seen one in a private collection. Not a TV CRT, but the scope is wide bandwidth and was used for early TV work. One of them is listed in the inventory list for the 1939 Worlds Fair RCA demonstrations. Now if you want to see a demonstration scope:  A DuMont Model 233, uses a 20" CRT (20AP1) Chuck
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