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This is Pentode Thermionic Valve B9A Base 12W 6.3V 22 (Dia.) x 77.8mm manufactured by RS PRO. The manufacturer part number is RS_678-4120. Its diameter is 22mm. The given dimensions of the product include 22 (dia.) x 77.8mm. It has a 6.3v heater voltage . About 0.76a is the required heater current . Its body length is 71.4mm. Designed as a b9a base type. With 12w anode required power . It has an overall length of 77.8mm. It contains 9 pins. It has about 500v output voltage .
For more information please check the datasheets.
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