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MT4

Information - Help 
ID = 19699
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Marconi's Wireless Telegraph Co. Ltd. 
Tube type:  Transmitting Triode, air cooled 
  <1925 very rare. ***
Identical to MT4 = CV1610 = VT10_GPO
Similar Tubes
Different maximum ratings:
  E71
Other characteristic (electr. data):
  E28
First year Jun.1919 ?? British Radio Valves - The Vintage Years: 1904-1925 page 129 but Ediswan before

Base Wires Wires only.
Was used by Transmittertube (Radio)
Filament Vf 12.5 Volts / If 6.3 Ampere / Direct / Specified voltage AC/DC
Description

Ediswan is probably producing, but unconfirmed, until 1919 when production went to Marconi Osram. 200 watt transmitting tube with anode voltage of 10,000.

 
Text in other languages (may differ)
Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 69, 83 and 133

mt4_mov_spec.png
MT4: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Usage in Models 1= 1920??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
 
marconi_mt4.jpg

 

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