New adiditions to my tube collection after
attending the AWA Rochester Conference
Telefunken RL12P35
This one is different from the other one I've seen, it has a third cap on top.
ELECTRAD DIODE, circa 1922
These appeared on the market right after the Fleming diode patent expired in November of that year.
Bottom view showing unusual socket.
DeForest Type 500
Transmitting Tube
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