vintage Texas Instruments model TI-82 Graphing Calculator w/ cover Works great | eBay
Loadline calculator for power stages with reactive load - Vacuum Tube Amplifiers - DIY
Designing a Preamp with Parallel Triodes
Preamp Gain and Output Impedance Calculator
The grid voltage of any triode valve is changed from - 1 volt to - 3 volt and the mutual conductance is 3 × 10 ^-4 mho. The change in plate circuit current will be
Valve Technology - A Practical Guide
12AX7 Calculator
Reverse-engineering an early calculator chip with four-phase logic