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The 12BZ7  (P/N 154-048, 154-0048-00) is a dual triode vacuum tube with a B9A (Noval) miniature 9-pin base.

Used in

Some instruments using part 12BZ7

Instrument Manufacturer Class Model Description Introduced
524 Tektronix Oscilloscope 524AD TV waveform monitoring scope 1953
570 Tektronix Curve Tracer 570 Curve tracer for tubes 1955