A conventional tube amplifier has a circuit whose fundamentals were well in place around a hundred years ago, so there are few surprises to be found in building one today. Nevertheless ...

It’s a conventional tube amplifier circuit in which the triode is a preamplifier for the pentode power output stage. The pentode is running in class A mode, and the high impedance of its output ...

Design analysis of the K2-W Vacuum Tube Op Amp’s design and ... this like you would a comic book. LTSPICE schematic of the K2-W Analog Computer Op Amp’s first stage. On the left half of ...

The goal was to keep the circuit simple and the number of amplification stages to a minimum while having enough gain to be driven by most preamplifiers, solid-state or vacuum tube. This suggested ...

The cool thing about op amps is that for many non-critical applications the op amp performance (gain, bandwidth, impedance, etc.) is so good compared to the circuit requirements that they really do ...