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R Type

Sensibly equivalent to:
R. TM
    
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Moorhead designed and produced his R type to be used in place of the British R receiving valve. The R was made according to strict British specs and shipped to England.
Moorhead also produced a transmitting tube called the B. Both of these valves were fashioned after the French type TM that had been designed in 1915 for the French military and then adapted to the British military standard. The internal structure is vertical because Moorhead was supplied with only the specs and no drawing.
Taken from Joe's article.
Thanks to Joe Gruber for sending the images.
The balloon envelope is  mm in diameter and, excluding the B4 base pins, is  mm tall.
Reference: Joe Gruber. Type R Type was first introduced in 1916.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
4.0
0.65
60
Updated June 12, 2020.
shape:balloon construction:pinch type:triode age:pre.1920 base:b4 pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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