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The 6BW4 is a dual-diode tube where both diodes share a common cathode. It has a 6.3 V heater and a B9A (Noval) miniature 9-pin base.
The 12BW4 is identical but with a 12.6 V heater.
Tek part number: 154-0119-00
6BW4 in 126 schematic