The 7199  (P/N 154-0309-00) is a triode-pentode vacuum tube with a B9A (Noval) miniature 9-pin base.

Links

  • 7199 @ radiomuseum.org

Some instruments using part 7199

Instrument Manufacturer Class Model Description Introduced
3L10 Tektronix Plug-in 3L10 1 - 36 MHz Spectrum Analyzer Plug-In 1965