R BBC Ediswan top pip – R type ES – HK2 BTH top pip – Marconi BBC DER
Early Ediswan type R GBP 180.
R type balloon by ES GBP 150.
HK2 by BTH British Thomson-Houston GBP 100.
DER balloon metal base GBP 250 pair.
Description
Early Ediswan type R receiving valve in excellent shape used on BBC sets.
An obscure R type balloon made by ES as reported on valve’s base.
The HK2 was a dull emitter by BTH British Thomson-Houston
Production for the DER started in 1921. The DER has already been shown on this website, please check it out. We remind these are a pair of Dull Emitter Receiving triodes.
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