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#1
11-28-2014, 06:23 PM
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Re-using a cathode After its been in air
Apparently it IS possible....
But--At all times the cathode is down to air--it MUST be kept above 100 deg C, as its moisture that damages it, not the air itself.... The Heater could be used for this...... I was reading something about Electron Microscope cathodes and the issues they had with them and their longevity/changing/re-using them etc.... Whether its worthwhile/worth the risk, going to the trouble of breaking a tube open to use its gun in a rarer tube by doing this--that would be up to the rebuilder/owner of the tubes.... 
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#2
11-29-2014, 02:55 AM
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I don't thhink an oxide cathode (as used in all CRTs we are likely to encounter) will survive being down to air. Pure tungsten and thoriated filaments may well do better but these were superseded in receiving valves in the 1920s. Now only used in some transmitting and high power valves.
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#4
11-24-2014, 01:21 AM
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Excellent news.
__________________
Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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#5
12-07-2014, 05:05 AM
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#6
12-07-2014, 10:34 AM
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Very good.
Has the shipment from RACS arrived?
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#7
12-12-2014, 03:19 AM
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Excellent news.. I'm glad everything arrived undamaged..
__________________
Looking for an all tube or hybrid color TV set from the late 1960s, early 1970s that's in a steal cabinet..
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#8
12-12-2014, 12:47 PM
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Hi to All,
RACS shipment to the ETF: For those who haven't seen Steve's photo on the ETF site, here is the first photo of the container's content which arrived at the ETF on Dec 11th. (Thanks! Steve for the pix and all the hard work to make this happen). The 2 page listing displayed below list the content. The numbers refer to pallet numbers and carton numbers, not the quantities of stuff inside. If an exhaustive listing had been required, for instance for gun models, etc. the manifest would have been 20-30 pages long. Total weight of the shipment was close to 4 metric tons. Come to the 2015 Convention! you will see everything with your very own eyes. Best Regards to all and Merry Christmas, jhalphen Paris/France
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#9
12-14-2014, 07:27 AM
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The equipment is at the Museum. Thanks to Jerome for all his help.
We have just started inventorying the stuff, but so far the biggest pleasant surprise is hundreds of cathodes and about a hundred filaments that are perfect for our color and black and white rebuilds.
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#11
12-17-2014, 01:47 AM
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Very nice to hear that the equipment has arrived safely at the museum.
"Return to USA of RCA non-processed CRTs". This sounds like the answer to the question I first asked last February in this post: http://www.videokarma.org/showpost.p...6&postcount=11
__________________
Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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#12
12-17-2014, 07:11 AM
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Hi Chris,
indeed, this line item describes the 10x 15GP22's sent by Molnar/Galanter/Folsom jr/Kubbe to RACS. I have asked Steve, as he unpacks the shipment, to make it a priority to check the condition of the returned tubes and inform their owners. No news yet, but 4 tons is a lot of stuff to unpack. From memory, 4 tubes were processed, some had up to 5 frit applications + oven passes to try to solve the Anode ring leakage. Also from memory, one tube has a new gun installed, is under vacuum, and from RACS's quote before the shipment left France, the Getter was still silver. The gun was not activated because if the tube leaked, the gun could be retrieved without having to replace again the Cathode and Filament. Best Regards jhalphen Paris/France Last edited by jhalphen; 12-17-2014 at 07:18 AM.
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#13
12-17-2014, 07:33 AM
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We are still unpacking. There are 6 tubes in a crate which we haven't inspected yet. Of the 4 in boxes, one has a broken face and the other 3 look fine.
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#14
12-17-2014, 07:56 AM
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Hi Steve,
Thanks! for the update. The 6 tubes in a crate are most certainly Mike Molnar's. He had a special wooden crate built with a snug compartment for each 15GP22. From memory, as i saw it at RACS, it was painted black and may have castor wheels. The 4 other CRTs are 2x Folsom jr/Galanter and 2x Kubbe. By "broken face" do you mean that the CRT faceplate bowl has separated from the Anode ring? - is the phosphor plate broken? Best Regards jhalphen Paris/France Last edited by jhalphen; 12-17-2014 at 08:00 AM.
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#15
01-02-2015, 03:33 PM
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I notice that there are people who collect classic coin op arcade games... I wonder if you'll get alot of those guys wanting the CRTs rebuilt.. They made alot of vertical type of CRTs especially in the early 80s types of games, that are hard to find to replace... That will be interesting if you all would be able to rebuild these CRTs too..
__________________
Looking for an all tube or hybrid color TV set from the late 1960s, early 1970s that's in a steal cabinet..
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