Single medium-mu triode in miniatur socket. It’s designed to assure dependable life and reliable service under the exacting conditions encoutered in mobile and aircraft applications. Very high degree of mechanical strength, with triple mica spacers and gold pins.
 

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This Post Has One Comment

  1. Yoric Knapp

    Hello,
    Which company manufactured these gold pin EC90 tubes?
    How do they sound compared to something like Mullard M8080, if you know?
    How much for a matched pair?
    Thanks,
    Yoric Knapp

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