Antique radios, Old Time Radios
AC/HLDD
Country:
Great Britain (UK)
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Brand:
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Tube type: |
Double Diode-Triode Audio Frequency |
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Identical to |
AC/HLDD
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Similar
Tubes |
Normally replaceable-slightly different:
H4D
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Base |
British-7-Pin, old (M7A)
Top contact with a cap.
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Filament |
Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC |
Description |
Va<250; Ra=13.8k, gm=2.6mA/V; G=36 at Va=100, -Vg=0.
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Dimensions (WHD) incl. pins / tip |
45 x 125 x mm / 1.77 x 4.92 x inch |
Information source |
Universal Vade-Mecum, Electron Valves and Semiconductor Devices group 292
- - Manufacturers Literature
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AC/HLDD: Propia
Santiago Lopez Perez
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AC/HLDD: PROPIA
Pedro Prieto-Castro
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AC/HLDD: Mazda DataSheet
Franz Scharner
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AC/HLDD: Mazda DataSheet
Franz Scharner
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from Just Qvigstad
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):31
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