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  1. rich.no

    Hum and other problems with "NOS" power tubes?

    I bought some Tung-Sol 5998s (8 of them) from a dealer. They were sold as NOS, but I guess I've been ripped off.   Some are top getters, others bottom getters. Several of them have a hum, and one makes a cracking sound. My question is this: if a tube really is NOS, will it hum? Make cracking...
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