6R-HH8
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Miniature 9-pin high-transconductance, frame-grid medium-mu twin triode designed by Hitachi for low-noise, high-gain VHF cascode amplifier applications in TV tuners. Equivalents: 6KN8. Real-Life Examples: Vintage high-end Japanese television tuners, specialized shortwave receivers, custom VHF preamplifiers.
MARKS TUBES 61