Z21, Z21MET, MARCONI, NEW BOXED, 215SG, CV1018, CV3835, CV3837, KTZ21, VR18

Z66, MARCONI, NEW BOXED, CV3839

Z77, OSRAM, MARCONI, NEW BOXED, EF91 5A/160H, 5A/160K, 6AM6, 6F12, 8D3, CV138, HP6, SP6, Z77

ZD17, MARCONI,, WHITE BOX, DAF91, 1FD9, 1S5, CV784, ZD17, AS USED IN, R209, WS88, SPY SET 30/1,

ZM1020, MULLARD NEW BOXED, GN4, GN4A RED FILTERED, NIXIE TUBE, AS USED IN RACAL INSTRUMENTS

ZM1020, MULLARD, NIXIE TUBE, NOS BULK PACKED, GN4, GN4A RED FILTERED, AS USED IN RACAL INSTRUMENTS