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This is Double Triode Thermionic Valve B9A Base 2.75W 12.6V 22.5 (Dia.) x 57mm manufactured by RS PRO. The manufacturer part number is RS_171-1621. Its diameter is 22.5mm. The given dimensions of the product include 22.5 (dia.) x 57mm. It has a 12.6 v, 6.3v heater voltage . About 0.15 a, 0.3a is the required heater current . Its body length is 50mm. Designed as a b9a base type. With 2.75w anode required power . It has an overall length of 57mm. It contains 9 pins. It has about 300v output voltage .
For more information please check the datasheets.
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