Amps w/Window to Glowing Tubes?

[J. Forster]

Scott Johnson wrote:

> . Transmitting tubes with high operating temperatures
> typically use borosilcate glass, which will pass more UV and IR, but lower
> power tubes use what is known as "flint glass" which blocks more UV and IR.

The IR is significant because (a) the eye does not realize it's being irradated
and (b) things that glow dark red to orange have very high IR compared to
visible output.

-John

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