Peter,
That glass sounds like the older glass some TV CRT's were made of way back in
time (40's-50"s?). The glass was really thick and had a light green color to
it. Whether it's the same or not is another question. Most transmitting tubes
use a boro-silicon glass like Pyrex due to its strength and heat capabilities.
There's other trade names besides Pyrex, but it doesn't have a greenish tint to
it. Smaller receiving type tubes use a leaded glass if I recall.
Best,
Will
*********** REPLY SEPARATOR ***********
On 7/31/06 at 5:09 PM Peter Chadwick wrote:
>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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