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3-500Z Base Seal temp and protection.

Discussion in 'Amateur Radio Amplifiers' started by N4ZAW, May 5, 2017.

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  1. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    The old, original 3-500Zs from Eimac should have been bronzed, the freakin' things lasted forever.

    I built one in the early 70s and sold it in 1988 and the "new" owner is still using the same tubes which are now about 45 years old.:p

    It's evidently a great design if everything is done just right.

    My lil' AL-80B has an "RF Parts" (Chinese) tube in it for 16 years now and still working fine, so they can get it right at least sometimes.
     

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