• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

The first tube "integrated circuit" (1926)

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Jack,

I've got a few of those vintage Radio News magazines and have seen that article in one of them. Note how the passive components like resistors are sealed in their own glass cylinders within the valve envelope to keep their outgassing in check. There is a lot of neat stuff in those old magazines. Imagine that they were able to fill an electronics magazine cover to cover before there were computers! I stoped subscribing to Popular Electronics when it became a computer mag.
 
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