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This gem, almost unobtanium, was designed to be a low-cost oscilloscope CRT and appeared in the RCA 151 oscilloscope.

This one is probably one of the earlier units, but RCA didn't always date code things in a way you could decipher. It's packed in the original box (disintegrating) with the original paper pack material. This is a spare for my 151 scope, and goes with the 885 (in the background) posted earlier.

This, along with the image multiplier I posted a week or so ago, is one of the more unusual tubes in my parts cabinet.

(This post is for that special someone on Poal, you know who you are.)

This gem, almost unobtanium, was designed to be a low-cost oscilloscope CRT and appeared in the RCA 151 oscilloscope. This one is probably one of the earlier units, but RCA didn't always date code things in a way you could decipher. It's packed in the original box (disintegrating) with the original paper pack material. This is a spare for my 151 scope, and goes with the 885 (in the background) posted earlier. This, along with the image multiplier I posted a week or so ago, is one of the more unusual tubes in my parts cabinet. (This post is for that special someone on Poal, you know who you are.)

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[–] • 1 pt

So RCA was pushing critical race theory back in the 30s? Boycott RCA!

But seriously, that is an awesome thing to have in your collection. I can't get a proper sense of scale on this CRT, but it does appear to be under 2" in diameter. That's one tiny scope screen! Do you know if this CRT is electromagnetically deflected with a yoke or electrostatically deflected with internal field grids? I imagine it was designed for low bandwidth applications where the use of yoke deflection would not be a significant drawback so I could see this helping keep the cost down. I should do some searching for info on this CRT since I have so many questions I would like answers to. That really is a cool little tube you got there.

[–] • 1 pt

It's electrostatically deflected. It was designed to be a cost-reduced tube for scopes back in the 30s.