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Hi to All,
On the topic of CRT rebuilding, over here in Europe we are not sitting on our butts doing nothing!
Witness, for instance this rebuild by French Co. RACS of a very rare pre-war Telefunken tube model RFB/VI-1 for our friend Eckhard in Germany.
RACS gave me permission to post these pictures, so here they are.
Rebuild was routine, except for the electron gun which the Lab commented "Had the complexity of a "Rube Goldberg" device": successive interconnections of focussing grids in the sequence G1-G2-G1-G2-G1-G2
The gun was entirely rebuilt, using the original metal electrodes which were remounted in a "copycat" entirely new gun.
Other interesting comments: the supplied tube was down to air, so of course it was cleaned out to all transparent glass then new P4 phosphor was applied. RACS commented that the internal side of the faceplate was slightly damaged by the many years the CRT had been down to air, so minute internal surface irregularities can be seen (with your nose on the screen!) after recoating.
And, oh yes, the CRT glass is Pyrex and rebuilding involved the now mastered art of fusing "salami-slices" of different glass softness to match Pyrex to soft glass.
Each picture is named with the proper step description in the rebuilding sequence.
Next step in the project is "bring your dead CRT to the ETF Convention" May 1-2-3 for a bulk shipment of 10-15 tubes to France to save on shipping costs.
Best Regards
jhalphen
Paris/France
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