GZ32 Mullard with full cup getter 52KU black plate silver halo batch code pair rectifiers

Description

The GZ32 is a medium power indirectly heated full wave rectifier for all use both in audio amplification and radio.

The early GZ32 made by Philips Mullard have numbers on glass with special glass treatment, usually cup or full getter, but also square and round getter 

Pair of Mullard BVA GZ32 cup  getter code on glass

Black plate, holy grail

We refer to  a  GZ32 valve made in the very early 1950s where all had etched numbers on glass at times the are no legible

Excellent with all vintage and modern amplifiers

Tested with AVO VCM 163

Each valve tested 100% with A1=A2 100% balanced