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ID = 42938
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to F242 = UY224 = PH224
Similar Tubes
Normally replaceable-slightly different:

Base UY-Base, 5 Pins (USA, April 1927) Top contact with a cap.
Filament Vf 2.5 Volts / If 1.75 Ampere / Indirect / Specified voltage AC/DC
Description Typ:-

Pa <1W; Va = 200; Vg2=100; Vg=-1.3;

Ia=1.6mA, gm=0.6mA/V, Ra=0.8M ohms

Babani gives heater current as 1.5A compared with original data of 1.75A. 

Information source Babani, International Radio Tube Encyclopaedia   
- - Manufacturers Literature   Philips Australia RIF29
F242: Auction site Marktplaats.
John Koster

More ...
F242: Telefunken Werkstattbuch
Wolfgang Bauer

F242: own collection
Peter den Boer

from Just Qvigstad

Usage in Models 2= 1930 ; 1= 1931

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

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