RZ1-150 is a full wave rectifier on a large four pin base, this exhibit typifies a large group of rather odd valves supplied by Mullard to the Admiralty during the 1930s. One almost wonders whether Mullard had a standing contract to supply a dozen (say) specimens of anything new and duly obliged with anything the Philips empire could dredge up! Specimens in this class usually carry the Mullard logo in red and are often marked 'ONYX' for no reason that we understand.

Type RZ1-150 is directly heated (4V at 4A) and is rated at 1000V, 150 mA, which is no more than a type 5R4GY.

The wide glass tube envelope is 53 mm in diameter and, excluding the L4 base pins, is 170 mm tall.

This exhibit was last updated on 07 August 2006