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R Type

Sensibly equivalent to:
R. TM
See also:
The Dawn of Broadcasting in the UK - M-OV NR13 Box
    
Extras ▼

 

This is a Marconi branded Type R from the early broadcasting era and carries the R on the front and the BBC stamp on the right. The base has an outer bright shell. The large style of BBC stamp carrying the words 'Type approved by Post Master General' was introduced in November 1922.
Thanks to Joe Gruber for sending the images.
The balloon envelope is 54 mm in diameter, and excluding the B4 base pins, is 90 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 07, 2021.
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