What *I* have done has nothing to do with your babbling!
Where ever did you get the clue?
I said the temperature is dropped to where it barely functions. That certainly would not likely be optimum! But optimum in one respect does not necessarily equate to optimum in another. If you want optimum lifespan for the tube you do not optimize for maximum gain, cathode emissions, or any number of other equally life shortening parameters.
Your cigar is wet. Citing something that doesn't support your claims is *not* going to endear you to anyone. Not quoting anything to support what you claim, but instead rattling off other interesting but irrelevant information from your source is just nonsense on your part.
See "Principles of Electricity applied to Telephone and Telegraph Work", 1953 Edition. p239.
"The oxide coating of the cathode is .0005" thick." "The cathode-grid spacing is .0006"." "The grid wirs are spaced a thousand to the inch and are .0003" in diameter." "The plate-grid spacing is .012"."
But distinctly did *not* allow the Bell System to network the entire country, _until_ they put it on microwave. Keep in mind that L carrier was designed in the 1930's. It was not the innovation that had the most dramatic effect, though it certainly added to it.
Dual redundant channels was not exactly new or inovative.
Hey, you made fun of amplifiers with 1-6 dB of gain... are you aware that the last stage in that particular bit of hardware is an amplifier with only 3 dB of gain? And the second stage is 6 dB? Only the first stage fits what you claimed... :-)
Virg, we're all getting old and forgetting a lot of this stuff... *Don't* go on memory. Look things up and verify what you think you remember before posting it.
I don't know about you, but I'm *not* sorry that I don't work with vacuum tubes any more. In fact, the same goes for individual components, be they transistors or even IC's. I like working with entire card level components, with embedded micropressors...
When I was a teenager I dreamed up designs that would have filled three floors of a large building, and required all of Hoover Dam to power. I could only dream about them. Today I whip something like that, totally in software, in an hour.