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ID = 30676
Great Britain (UK)
Brand: GEC, General Electric Co.; London
Tube type:  Glow Indicator (Neon)   Indication 
Identical to Tuneon-Button = Tuneon-F = CV982

Base Edison medium E14 = 14 mm, mignon
Was used by Radio/TV-reception etc.

Button Tuneon, ac or dc operation.
200-260V supply, 200V striking, Series R >300k, I <0.6mA.
This is also known as the PO type 27A.

In GEC datasheet also listed as Button "Tuneon" type F

Dimensions (WHD)
incl. pins / tip
12 x 28 x mm / 0.47 x 1.10 x inch
Information source - - Manufacturers Literature   
Tuneon-Button: RFJ
Roy Johnson

More ...
Tuneon-Button: own collection
Peter den Boer

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