Nostalgia" vacuum tube input/output composite op amp | Download Scientific Diagram
![Vacuum-tube amplifier with parallel-tuned resonator [7]. | Download Scientific Diagram](https://www.researchgate.net/publication/317415804/figure/fig3/AS:503091729571842@1496957823497/Vacuum-tube-amplifier-with-parallel-tuned-resonator-7.png "Vacuum-tube amplifier with parallel-tuned resonator [7]. | Download Scientific Diagram")
Vacuum-tube amplifier with parallel-tuned resonator [7]. | Download Scientific Diagram
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