Antique radios, Old Time Radios

AC/HLDD

ID = 29341

Country:

Great Britain (UK)

Brand:	Common type Great Britain tube/semicond.
Tube type:	Double Diode-Triode Audio Frequency

Identical to

AC/HLDD

Similar Tubes

Normally replaceable-slightly different:

H4D

Base	British-7-Pin, old (M7A) Top contact with a cap
Filament	Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Description	Va<250; Ra=13.8k, gm=2.6mA/V; G=36 at Va=100, -Vg=0.
Dimensions (WHD) incl. pins / tip	45 x 125 x mm / 1.77 x 4.92 x inch
Literature	Universal Vade-Mecum, Electron Valves and Semiconductor Devices group 292 - - Manufacturers Literature


	AC/HLDD: Propia Santiago Lopez Perez

AC/HLDD: PROPIA
Pedro Prieto-Castro

AC/HLDD: Mazda DataSheet
Franz Scharner

Usage in Models

2= 1933? ; 4= 1933 ; 3= 1934? ; 6= 1934 ; 1= 1935? ; 2= 1935 ; 4= 1936 ; 5= 1937 ; 1= 1938? ; 3= 1938

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):31

Collection of Pedro Prieto-Castro (E)

Collection of Bart Slager (F)

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