Electronic Calculators—Desktop -- Vacuum Tubes to Transistors—From the Anita Mark VIII to Hewlett Packard and Wang | National Museum of American History
ANITA Mk 10 Calculator
A first generation tube calculator: BULL GAMMA 3 - technikum29
Loadline calculator for power stages with reactive load - Vacuum Tube Amplifiers - DIY
Calculator Made of Discrete Transistors - Hackster.io
A first generation tube calculator: BULL GAMMA 3 - technikum29