U10 Marconi Osram balloon rectifiers mesh plate V shape base early type DW2 UU4

Description

The U10 is a  directly heated full wave rectifier where cathode is internally strapped on one side of filament.

The U10 shown here have thin base, balloon shape with mesh anode! The U10 was used in radio and small audio amplification and was first introduced in 1930.

All three Marconi Osram U10 have been tested 100% emission and in working order.