An operational amplifier, or op-amp, is basically a differential amplifier, i.e. it is used for amplifying the difference between two inputs. There are two signal input terminals and one signal output ...

one 1 k, two 10 k, and one 100 k 1/4 W resistor, 0.0047 F and 0.033 F capacitors, two 1N914 (or similar) silicon signal diodes, 2N3904 and 2N3906 transistors. Fig. 8.1: Generalized op amp ...

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 ...

Part 5 provides spec summary of the GP/R K2-W vacuum-tube op amp and discusses measurement constraints/conditions and LTspice modeled output. The K2-W vacuum-tube op ...