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Thread: Sovtek 5Y3GT--good tube?

  1. #1
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    Sovtek 5Y3GT--good tube?

    I've been a little suspicious of new-production rectifier tubes, so I'm wondering how the Sovtek 5Y3GT is turning out in terms of longevity/reliability.

    I read one post that mentioned that using them resulted in a higher B+ voltage, but it was only +10V. With a 400V supply, that's only a 2.5% difference, and I've rarely seen any two rectifier tubes put out exactly the same B+ voltage.

  2. #2
    fyl
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    The Sovtek is a good recto but it's not a 5Y3GT. It's a Russian 5Z4M, an indirectly heated recto with lower plate impedance quite close to the US 6106. B+ can be 30V or more higher depending on the amp.

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    Thanks, fyl,

    It just occurred to me that I may actually have one of these that came installed in an amp I bought.

    A few years ago, I think some tube relabelers were trying to pass them off as GZ34s.

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    fyl
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    A few years ago, I think some tube relabelers were trying to pass them off as GZ34s.
    Yep, a number of relabelers sold them as GZ34s. Some even tried to pass them as Mullard GZ34s...



    From the Tubemonger web site.

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