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This exhibit is a half wave mercury vapour rectifier. On test the helical filament glowed dull orange at 2.5 Volts but was a bright orange at 4.0 Volts. At 4.0 Volts the consumption was 4.3 Amps. 4.3 Amps seems high and so the filament may be designed for 3-3.5 Volts. The gap to the anode is large and this suggests a high voltage, although when in operation the voltage drop across an MV rectifier is small.
The filament ribbon looks much the same as the NU7.
A closer look at the filament.
The classic envelope is 39 mm in diameter, and excluding the B4 base pins is 103 mm tall.
Reference: Observation.

 

Pin Connections
B4
1
2
3
4
tc
-
-
f
f
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
4.0V
4.3
Updated February 22, 2015.
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