Original vintage tube. Made by the Marconi - Osram Valve company. GLOBE bulb. Direct heated triode - DHT. I can not see the logo. But it is obviously a VERY RARE and VERY EARLY PX4 tube - made around 1930. FIRST VERSION of PX4. Box is included but damaged. See pictures.
Old stock. Tested on Funke W19S military tester with BEST results - like NEW (NOS).
EXCELLENT audio tube. VERY HARD to find!
(42 05 05 1)
Watch our other auctions, too. A lot of rare German and European audio tubes available!
International shipment (registered airmail): 30 USD.
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