R Marconi pip top – BTH B4 – Frelat R balloon – R Mullard – Cosmos SP16 red – R type European – ARDE Ediswan – BTH R

Description

This section shows eight top pip valves either with metal or bakelite base.

Early 1920’s Marconi balloon R type top pip.

Frelat R type Dutch made metal base top pip.

B4 BTH British Thompson Houston, first dull emitter made by BTH.

Mullard R top pip bakelite base early type.

SP16 red by Cosmos.

R type balloon metal base top pip European.

BTH R type long sleeve anode metal base top pip.

ARDE by Ediswan general purpose valve.