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FERNSEH · 15th Oct 2019, 5:39 pm

The Radiomuseum lists an EB40 double diode. Might have been intended for use as a VHF or UHF mixer. Note that only the active pins are present on the Rimlock base. https://www.radiomuseum.org/tubes/tube_eb40.html
The pre-war EB4: https://www.radiomuseum.org/tubes/tube_eb4.html
All these 6.3volt double-diodes are designated as EBxx and not EAAxx

DFWB.

15th Oct 2019, 5:39 pm	#34
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Why Both EAA91 and EB91? The Radiomuseum lists an EB40 double diode. Might have been intended for use as a VHF or UHF mixer. Note that only the active pins are present on the Rimlock base. https://www.radiomuseum.org/tubes/tube_eb40.html The pre-war EB4: https://www.radiomuseum.org/tubes/tube_eb4.html All these 6.3volt double-diodes are designated as EBxx and not EAAxx DFWB.