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R Type

Sensibly equivalent to:
R. TM
See also:
Some Important British Valves - In the Beginning - Osram - The Dawn of Broadcasting in the UK
    
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This exhibit is a classic early Type R made for the British Government (note the 'arrow' marking). It is probably of late WWI vintage. We expect that this particular sample was made by GEC-Osram before their immediate post-war reorganisation as a result of which they became M-OV.
The cylindrical anode is threaded by a helical grid and within that passes the single strand of Tungsten wire as the filament. In use the filament would burn brightly just like a light bulb.
The spherical envelope is 52 mm in diameter and, excluding the B4 base pins, is 89 mm tall.
References: 1005. 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
ra
gm
4.0
0.7
100
40k
0.26
Updated January 08, 2013.
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