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AUDIO VALVES: U50, 5Y3G, 5Y3GT, CV1268, CV3754,

The U50 is a directly heated full wave rectifier.  Introduced in 1937 as the smaller brother of the U52 for less current hungry applications, it shares the same similar electrode cage construction characteristics with the U52 in having a pinch mounted cage, with top mica envelope security and a pinch situated bar getter.   The filament is a suspended inverted V tape filament. 
The maximum reservoir capacitance is 32 µF and minimum series resistance is 100 Ohms.

 

CV1258, MILITARY SPEC U50, MARCONI OSRAM, MOV, IN RST BOX, NOS, AIR MINISTRY SURPLUS, DOVER JANUARY 1953 PRODUCTION

CV1258, MILITARY SPEC U50, MARCONI OSRAM, MOV, IN RST BOX, NOS, AIR MINISTRY SURPLUS, DOVER JANUARY 1953 PRODUCTION
U50, MARCONI, DOVER, DECEMBER 1952 MANUFACTURE, SCARCE

U50, MARCONI, DOVER, DECEMBER 1952 MANUFACTURE, SCARCE
U50, MARCONI, BROWN BASE, JG, HAMMERSMITH JULY 1953 PRODUCTION,

U50, MARCONI, BROWN BASE, JG, HAMMERSMITH JULY 1953 PRODUCTION,
U50, OSRAM, BLACK BASE, HAMMERSMITH 1950 PRODUCTION,

U50, OSRAM, BLACK BASE, HAMMERSMITH 1950 PRODUCTION,
U50, MARCONI OSRAM, BLACK BASE, HAMMERSMITH 1949 PRODUCTION,

U50, MARCONI OSRAM, BLACK BASE, HAMMERSMITH 1949 PRODUCTION,
5Y4G, HYTRON, WHITE BOX

5Y4G, HYTRON, WHITE BOX
5Y4G, NATIONAL UNION, WHITE BOX

5Y4G, NATIONAL UNION, WHITE BOX
5Y4G, RAYTHEON, WHITE BOX

5Y4G, RAYTHEON, WHITE BOX
5Y4G, TUNG-SOL, WHITE BOX

5Y4G, TUNG-SOL, WHITE BOX
5Y4G,GE, NEW BOXED

5Y4G,GE, NEW BOXED
5Y4G, HALTRON, NEW BOXED

5Y4G, HALTRON, NEW BOXED
U50, MARCONI, HAMMERSMITH, TESTED

U50, MARCONI, HAMMERSMITH, TESTED