12BY7A

High-Transconductance Sharp-Cutoff RF Pentode Tube, featuring an internal structural grid layout optimized for wide-band video driving. It functions as a high-gain video output amplifier, localized RF oscillator, or color TV chroma amplifier handling consistent signal boost limits, housed in a standard 9-pin miniature glass envelope (Noval, T-6.5 bulb). [1, 2, 3, 4, 5]