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CV5159

Sensibly equivalent to:
HR8 SU42
    
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The CV5159 (commercially the SU42) is an EHT rectifier with the pre-war 4.0 V British standard heater.
The CV5159/SU42 was made as a replacement type and requires an effective series resistance of 5,000 Ω and a maximum reservoir capacitor of 1.0 μF. The attached data-sheet for the near equivalent HR8 gives the maximum RMS input voltage as 5 kV, Maximum average output current as 50 mA and requires a series resistance of 4,000 Ω.
The anode has eight radial cooling fins and the ceramic at the top indicates high voltage and probably a valve designed for industrial use.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 98 mm tall.
References: Data-sheet & 1040.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
nc
h
nc
nc
nc
nc
nc
h,k
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
1.25
6,000
40
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December29, 2025.
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