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ID = 87228
Brand: TWW / WTW, Tokyo Musen; Tokyo
Developer: TWW / WTW, Tokyo Musen; Tokyo 
Tube type:  Triode, vacuum   Text 
  <1925 very rare. ***
Identical to TV-7 = Triode_Tokyo-Radio-Co-Ltd
First Source (s)
1924 : -- Original prospect or advert

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.72 Ampere / Direct / Battery =

This tube is a high vacuum Detector and Amplifier type.

Information from Hiroyuki Kato san:

Tokyo Radio's TV-7 tube was advertised in a magazine in 1924.
It received the type certificate from the Ministry of Communication in 1925.
1926 issue of the Radio Yearbook lists the TV-7 as a detector/amplifier and the specifications are as below.

Plate Voltage: 80V
Filament Voltage: 4.5V (Another source says 4.0V)
Filament Current: ~0.7A

Dimensions (WHD)
incl. pins / tip
45 x 123 x mm / 1.77 x 4.84 x inch
Weight 48 g / 1.69 oz
Information source -- Collector info (Sammler)   Dawn of Tube Production in Japan - Ohtsuka.

uv_triode_tube~~153.png TV-7: Fin Stewart
Fin Stewart

Just Qvigstad


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