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heathkit a-6a

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    Heathkit A-6A Tubes

    Can someone help me? I have a Heathkit A-6A (trying to get working). I have a schematic but It doesn't indicate WHAT the back center position tube is supposed to be. (The front center position is a 6 SN7). Would the back be another 6 SN7? Somebody threw a 5Y3 tube in that position but it keeps...
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