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U16

Sensibly equivalent to:
HVR1 SU2150
See also:
Pioneers of HT Rectifiers - Osram Advert, October 1936
    
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M-OV Type U16 was originally introduced in the early 1930s, although this specimen looks post-war.
The U16 was intended for oscilloscope EHT supplies but was never widely used.
On the whole the Cossor type SU2150A was a better valve for oscilloscope use and was generally preferred.
The U16 was employed by EMI in its range of pre-war television receivers for the CRT EHT supply. The EHT being derived from a 5000 Volt winding on the mains transformer.
The anode is a thin disk 30 mm in diameter and is held horizontally. The filament, also horizontal, is 'W' shaped and supported 6 mm away from the anode on stout wire supports.
The maximum reservoir capacitor for this valve is 0.25 µF and the maximum current is limited to 2 mA.
Our exhibit is wrapped in fabric adhesive tape. This suggests that the envelope to base cement had failed at some time. It was very common for the cement to come unstuck from the glass.
The classic envelope is 46 mm in diameter and, excluding the B4 base pins, is 111 mm tall.
References: Datasheet & 1040. Type U16 was first introduced in 1933.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
2.0
1.0
5000
2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December01, 2012.
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