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 Reverse-engineering an IBM Mainframe Vacuum Tube Pluggable Module
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 Return to top of page · Post #: 1 · Written at 12:20:20 PM on 30 July 2025.
OliBHolmes's avatar
 OliBHolmes
 Location: Nuriootpa, SA
 Member since 28 June 2025
 Member #: 2734
 Postcount: 25

Again, not explicitly radios or televisions, but it uses valves so...

https://youtu.be/e6OqUsPVWHc?si=qUyRgLfPs-nAgMMv
 
 Return to top of page · Post #: 2 · Written at 7:15:59 PM on 30 July 2025.
Ian Robertson's Gravatar
 Ian Robertson
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2621

Spoiler alert:
A dual 2 input NAND gate using a 12AT7 and a 6AL5.

You can build any logic function out of 2 input NAND gates.
 
 Return to top of page · Post #: 3 · Written at 7:39:15 PM on 30 July 2025.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6882

You can build any logic function out of 2 input NAND gates.

The Apollo Guidance Computer (used for the first moon landing) was built from 3-input NOR gates. "NOR gates are universal logic gates from which any other gate can be made, though at the cost of using more gates."
 
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