Vacuum Tube teardown - the ECH81 signal mixer tube

I will continue looking into more tubes and perform a teardown of course, mainly to see how these are built and how a bunch of wires and tins ended up starting the electronics revolution. One of the major electronic products of the XXth century was the radio, and that is what I will be looking at next - the tubes of the common radio receiver. In this video I look a common signal mixer tube - the ECH81 used in the first radio signal processing stage of a typical superheterodyine radio.

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Vacuum tube teardown series:
Carmen 3 Radio teardown: https://youtu.be/aS4DiE0gWBk
EM80 teardown: https://youtu.be/ShIjmKChoiQ
ECL82 teardown: https://youtu.be/K5V0bw533ko
EZ80 teardown: https://youtu.be/f2ggh9OXKmc
EBF89 teardown: https://youtu.be/xjjwSCahduM
ECH81 teardown: https://youtu.be/u2PklbUwGKM
ECC83 teardown: https://youtu.be/rjnAB9RGBXc

Music:
The Builder by Kevin MacLeod http://incompetech.com
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