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ID = 25512
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Transmitting Triode, air cooled   Power/Output 
  <1925 rare.
Identical to Z-I = Z1_Ideezet = Z1 = PT1_Pope
Production stop 1927
Successor Tubes TA04/5  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 3.8 Volts / If 1.4 Ampere / Direct / Battery =
Description Most of the Z types had a matching rectifier which were a look-alike of the Z type. The rectifier for the Z I was the ZG I which had no grid and grid connection. For further data of the Z I, see Z1. The Z and Zg tubes were replaced in 1927. The successor of the Z1 was the TA04/5. 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
55 x 105 x 55 mm / 2.17 x 4.13 x 2.17 inch
Information source - - Manufacturers Literature   R38H 1-12-1925

b4direct_3.png Z-I
Peter den Boer

Just Qvigstad
Z-I: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Collection of




The tube in the picture is most likely a Z 1 and not a Z I. this one is a Z I.

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