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The 6BW4 is a dual-diode tube where both diodes share a common cathode. | The 6BW4 is a dual-diode tube where both diodes share a common cathode. | ||
The 6BW4 has a 6.3-volt heater. | The 6BW4 has a 6.3-volt heater. | ||
There is also a 12BW4, which is the same but with a 12.6-volt heater. | There is also a 12BW4, which is the same but with a 12.6-volt heater. | ||