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ID = 44416
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Transmitting Triode, air cooled 
  <1925 rare.
Identical to Z3
Similar Tubes
Normally replaceable-slightly different:
Production stop 1927

Base Sidecontact and top contact
Filament Vf 8 Volts / If 4.5 Ampere / Direct
Description 130W plate dissipation, 2.5 to 4KV, 150mA, mu 30.
Bi-pin base, plus side grid cap and top anode cap.
Advertised in 1923. Most of the Z types had a matching rectifier which were a look-alike of the Z type. The rectifier for the Z3 was the ZG3 which had no grid and grid connection. The Z and Zg tubes were replaced in 1927. The Z3 was replaced by the TA4/125. 
Information source -- Collector info (Sammler)   Banneitz, TB der drahtl. Telephonie u.Telegr. 1927
-- Original-techn. papers.   Di tubo in tubo, Soresini, pg 97
Peter den Boer

Z3: own collection
Peter den Boer

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