Antique radios, Old Time Radios

HF_Mullard

Country:	Great Britain (UK)	Brand:	Mullard Radio Valve Co. Ltd.;
		Tube type:	Triode, vacuum RF/IF-Stage
			<1925 rare.

Tube ID = 44207

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Identical to	HF_Mullard
Similar Tubes	Normally replaceable-slightly different: LF_Mullard
First Source (s)	17.Sep.1924 : The Wireless World, London (WW, 79) new valve tests

Base	Europe 4-Pin (A, 4A, B4, since 1914)
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.
Literature	-- Collector info (Sammler) Banneitz, TB der drahtl. Telephonie u.Telegr. 1927

HF_Mullard: WW Sept 1924 Valve Test Article
Roy Johnson

HF_Mullard: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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