12BY7A

Miniature 9-pin high-transconductance sharp-cutoff pentode engineered specifically for wideband video output stages, television instrumentation, or as a high-gain driver in transmitters. Equivalents: 12BY7, 12BY7A/B. Real-Life Examples: Kenwood TS-830S/TS-530S amateur radio transceivers, vintage Tektronix 500-series oscilloscopes, Yaesu FT-101 HF transceivers.