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3A/142A

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ID = 30957
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to 3A/142A = SY4102D
Similar Tubes
Normally replaceable-slightly different:
  102D ; 3A/142AY ; 4102D ; 4102E ; CV1640 ; CV1641
Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Telephony
Filament Vf 4 Volts / If 0.25 Ampere / Direct / Specified voltage AND current AC/DC
Description

The 1955 CV register gives the CV1641 (Previously named VT32D and VT32)as being directly equivalent to the 4102E. Babani quotes the filament rating as 2.1V 1A.
The STC 3A/142A is quoted by the CV register as a suitable replacement for both the CV1640 and CV1641. Also replaced the STC 4102D

 
Dimensions (WHD)
incl. pins / tip		 46 x 118 x mm / 1.81 x 4.65 x inch
Weight 60 g / 2.12 oz
Information source -- Original-techn. papers.   
Babani, International Radio Tube Encyclopaedia   
- - Manufacturers Literature
uv~~18.png 3A/142A: Fin Stewart
Fin Stewart

Just Qvigstad 		3a_142a_characteristics.png
3A/142A: My schematic colection.
Pier Antonio Aluffi
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