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Two questions have come to mind.
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Author:  Toobphonic [ 28 Feb 2018, 10:28 ]
Post subject:  Re: Two questions have come to mind.

I saw an article somewhere about this.

Creating X-rays with a standard vacuum tube
https://www.youtube.com/watch?v=yLSu_UjrcUA

Author:  laurie54 [ 28 Feb 2018, 12:29 ]
Post subject:  Re: Two questions have come to mind.

So it looks like the tubes are not made of sand glass. (Pyrex) Cool ok then now if the city only had older TV shops left i could explore but alas they are all gone.

Author:  Geek [ 01 Mar 2018, 00:36 ]
Post subject:  Re: Two questions have come to mind.

According to RCA Tube Manuals, they're lime glass.

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