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See also:
Mullard Miniature Series Advert
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The 70B1 is a miniature voltage stabiliser tube that Mullard introduced in 1950. The stabilised voltage is 70 V and the current range is 5-15 mA. The given AC resistance is 300 Ω.
Looking closely at the base one can see a central tube entering the cylindrical anode.
The thin glass tube envelope is 9 mm in diameter and, excluding the wire leads is 51 mm tall.
Reference: Advert. Type 70B1 was first introduced in 1950. See also 1950 adverts.


Updated April 29, 2013.
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