Jerome, thanks again for a comprehensive reply. I think the meaning of the word "glassblowing" may have suffered in translation. Here in the UK it means a wide range of skills for working with glass, not just the actual blowing of a glass vessel. So fusing a new CRT neck on to the cone, sealing the pinch etc are all glassblowing. So is making a graded seal, though this requires much more skill.
I agree with you totally about not trying to make Pyrex CRTs from scratch. If you're going to attempt this you might as well make life easier by using soft glass. The cost of the moulds is a big problem if you only need a few CRTs.
A question about h/k assemblies. In the UK VRAT forum
http://vintagetvandradio.myfreeforum.org/index.php the point was made that CRT cathodes emit from the end of the cathode cylinder but valve cathodes emit from the main body. This would make valve h/k assemblies unsuitable for CRTs. Do you know anyting about this?
05-28-2013, 01:34 AM
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