Rich said:
>As I understand it, the recipe is similar to Pyrex in that it uses
boron as a fluxing agent instead of lead.<
Going back a few years, I remember reading that the 24G, 35T and 35TG had
envelopes of something called 'Nonex' glass, which had a greenish tinge. Those
tubes all had tantalum anodes which were bright yellow at full whack, and the
24G and 35TG were used up into the VHF region - 120MHz. the 24G was used in the
BC640 ground station VHF tx, which somebody told me, was so bad for TVI it
caused trouble even when switched off! So any ideas what 'Nonex' glass was?
I could see the glass softening around the anode seal, just because of the
conduction up the connecting stem, especially if the glass was lower melting
point and the cooling inadequate.
73
Peter G3RZP
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