After a brief review of the history of the K2-W vacuum-tube op amp, an LTspice model is used to create its schematic in ...

Capacitor C1 is a Miller-effect capacitor. 2. The LTspice schematic of the K2-W op amp in a basic inverting configuration incorporates the symbol created for the K2-W model. The gain G is set to ‒1.

The factors influencing the phase shift are the inherent phase lag of inverting feedback, the phase lag introduced by the dominant and nondominant poles in the open-loop gain (Aol) of the amplifier, ...

The added passive components at the NE570 inputs are chosen to allow R 3 to be adjusted for a 3 Vrms output from U 2A, the level at which its datasheet indicates that that op amp exhibits the lowest ...

But to make that measurement you need an amplifier circuit designed for the thermocouple being used. Linear Technology LTC 1049 Low Power Zero-Drift Operational Amplifier with Internal Capacitors ...