R Marconi Osram colour top pip – R Moorhead balloon top pip amber- R BBC BTH – R Marconi balloon metal base top pip triode

Description

This section shows four interesting early made R type valves by the most important makers back those days.

On the left a Marconi type R gold/amber tinted with cylindrical anode circa 1922. You can clearly see the amber envelope is a classic of phosphorus gettering; comes with metal base, this is by far one of the rarest valve on this website.

Another interesting valve next to the Marconi is the R type made by San Francisco based Moorhead. This is a R type receiving and transmitting valve light amber colour circa 1921.

R type made by BTH British Thompson Houston boasting a dark amber phosphorus gettering,  top pip, metal base circa 1922 it was one of the first made by BTH and comes with original box!

Marconi R type with original box cherry red tinted phosphorus gettering like all valves shown in this section.