Antique radios, Old Time Radios
HF_Mullard
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Country:
Great Britain (UK)
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| Identical to |
HF_Mullard
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| Similar
Tubes |
Normally replaceable-slightly different:
LF_Mullard
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| First Source
(s) |
17.Sep.1924 : Wireless World (The), London (WW, 79) new valve tests
1924 : British Radio Valves - The Vintage Years: 1904-1925 p. 186
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 3.8 Volts / If 0.7 Ampere / Direct / Battery = |
| Description |
These tubes use an inverted half cylinder for the anode, below which is a coiled grid aboved the arced filament.
The tests by Wireless World indicated that there was little or no difference between a sample of the Mullard HF and LF valves. The curves were almost identical and their performance in a receiver was the same when the RF and AF stages were interchanged.
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| Information source |
-- Collector info (Sammler) Banneitz, TB der drahtl. Telephonie u.Telegr. 1927
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HF_Mullard: Fin Stewart
Fin Stewart
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Just Qvigstad
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HF_Mullard: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector
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