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R Type

Sensibly equivalent to:
R. TM
See also:
Moorhead: Historic Documents
    
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This exhibit looks to be a Morehead R Type but fixed onto a Moorhead-Marconi-DeForest base cap. In the Moorhead adverts of the time the R was sold as un-based.
Note the indentations on the envelope that hold the anode rigidly in place.
Thanks to Joe Gruber for sending the images.
The thin glass tube envelope is 22 mm in diameter and, excluding the UV base pins, is 92 mm tall.
Reference: Joe Gruber. Type R Type was first introduced in 1916. See also 1916 adverts.

 

Pin Connections
UV
1
2
3
4
g1
f
f
a

 

Updated February 08, 2021.
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