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ID = 31187
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to PY33
Predecessor Tubes PY32  

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 29 Volts / If 0.3 Ampere / Indirect / Series, ~ = (AC/DC defined current)
Description Va <700 V piv, 250 rms; Ia < 325ma.
Replaced the PY32. Has higher peak current and surge ratings permitting better smoothing, by enabling higher values of filter capacitance. 
Dimensions (WHD)
incl. pins / tip
37 x 112 x mm / 1.46 x 4.41 x inch
Information source - - Manufacturers Literature   
PY33: FC
Frank Cuffe

PY33: Mullard Pocket Data Book
Alexander Küffer

PY33: Manufacturer's Literature
Emilio Ciardiello

from Just Qvigstad

Usage in Models 1= 1954 ; 1= 1961

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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