MH4 Marconi clear glass balloon shape mesh plate cup getter Holy Grail equiv. 354V AC/HL

Description

The Marconi Osram MH4 is an indirectly heated triode. It is a high efficiency general -purpose valve for use as detector or  low frequency amplifier.

For sale most of MH4 variations.

The Marconi MH4 here shown have balloon shape with mesh plate early 1930s production and hard to come by these days. Excellent driver for PX4 and PX25 amplifiers.