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R Type

Sensibly equivalent to:
R. TM
    
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This is an Osram Type R probably made during WWI for the UK Army. The envelope carries the words Made in England. The copper base shell indicates an early production valve.
The original box carries the words Valve WT for Wireless Telegraphy Valve a typical UK military type of description. The serial number 10775 is also on the box.
Thanks to Joe Gruber for sending the images.
The balloon envelope is 53 mm in diameter, and excluding the B4 base pins, is 88 mm tall.
References: 1005, 1003 & 1004. Type R Type was first introduced in 1916.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
4.0
0.65
60
Updated July 06, 2021.
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