S21 MARCONI OSRAM MOV VALVE TUBE LAMPE PINCHED WAIST 100% MESH PLATE ULTRA RARE B262

Screen grid Tetrode RF / IF Stage

Socket Base Europe 4 Pin Top contact screw type

Filament Heater Filament Vf 2 Volt / If 0.1 Ampere / Direct / Battery =

Fully tested at 2,5mA ( good start at 0,8mA ) with tube tester Funke RPG4/3 military calibrated

British made in 1930's Oldest production ultra rare valve of the spark era

Mesh plate reinforced in silver With original OSRAM BVA blue & gold label still intact

Vintage oldest Vacuum tube valve for use in multi-stage receivers like

Vintage Radio Marconiphone 66 of year 1931

Vintage Radio Tasma 150 from Australia of Year 1932

Vintage Radio His Master's Voice ( Masters, HMV, H.M.V., Marconi) Hayes, Middlesex, GB Portable Six 459 of Year 1932 1933

Vintage Radio 3 valve Battery 252 Marconi Co. ( Marconiphone, Marconi's Wireless Telegraph Co. Ltd.) GB of year 1932

Vintage Radio Marconi Co. ( Marconiphone, Marconi's Wireless Telegraph Co. Ltd.) GB model 255 of year 1932 Vintage Radio His Master's Voice ( Masters, HMV, H.M.V., Marconi) Hayes, Middlesex, GB model 459MC of Year 1933

Vintage Radio Marconiphone 283 of year 1933 Vintage Radio Marconiphone 255MC of year 1933

Vintage Radio His Master's Voice (Masters, HMV, H.M.V., Marconi); Hayes, Middlesex, GB model 462 of year 1934 Vintage Radio Marconiphone 284 of year 1934 Vintage Radio Marconiphone 269 of year 1934

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