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"he must have"

What leads you to assume that it was the earlier, 12AT7 version Mike was talking about?

Below is a link to one of his 12AU7 VTA posts, but a search will turn up others. If I had to speculate, I think Mike had tried both, because in one post he listed the resistors to change to convert the circuit from the AT7 to the AU7.



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  • "he must have" - 1973shovel 10:44:53 08/13/21 (0)

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