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In Reply to: Re: You know, that glass . . . posted by Jeff A W on April 5, 2007 at 05:46:16:
Jeff-
Yep, this book states that it is a completely revised version of the 1951 book "Materials and Technology for Electron Tubes" It doesn't say if Kohl wrote the earlier version, or what other books he wrote, but...
It also says the earlier version had FOUR chapters on glass, which were condensed down to one for this version. It also says that Kohl was giving a Graduate course on "Tube Techniques" at Stamford and that this book, as well as the earlier version were seen as advanced texts for Tube Technicians.
You would have to wonder if they realized in 1960 when the revised book came out, that not even 10 years later tubes would be virtually gone from consumer electronics. (Except for TV's of course. And computer monitors) And that so much tube manufacture would quickly end in the US.
--Matt
"You know why is that?"
Follow Ups:
Matt- I was looking some more at the 943-page RCA "Electron Tube Design", which was also derived in part from lectures for RCA engineers and "privately issued by Electron Tube Division, Radio Corporation of America, for use by its employees and for restricted distribution".There are two chapters on glass, "Glass For Receiving Tubes" by J. Gallup, and "Glass and Its Properties and Seals" by J.C. Turnbull and G.E. Eiwen. As it happens, these are exactly 40 pages altogether. The first is something of an intro and describes properties, the second gets much more into the nitty gritty, as it were. By my count, 54 types of glass are explicated, at least 18 of which are identified as originating in Corning, e.g., Corning 8160, 8161, 0083, 9010, 9019 3320, 7761, etc. etc.
One thing that becomes apparent is that in some tubes more than one type of glass was used, for stem vs. bulb, etc.
Switching overseas, Philips published the "Philips Technical Review" out of Eindhoven in the 1940s and '50s, and I remembered an article I'd copied on "The Life and Reliability of Valves" (in vol 18, no. 7, 1956-57) had some discussion of glass issues in relation to the manufacture of their "SQ" tube series. They noted that glass even of a specified type was "not a perfectly constant product", and required test runs for adjustment for each production run. Variables in the automatic sealing machines also had to be fine tuned continuously. It appears that Philips also championed the immersion of sample tubes into boiling water followed directly by plunge into cold water testing, on an hourly basis during valve production.
I was hoping someone would kick in with more on Westinghouse tube production during the '50s-'60s too.
I was just made aware of this website today...
Technical books scanned and put online in PDF format...
--Matt
"You know why is that?"
Yes, but thanks for making sure. Maybe he'll do some Kohl next!
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