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Yeah, there are lots of 12AX7 substitutes with varying amounts of gain. Off the top of my head, 7025 (which might be full gain but mil-spec), 5751, 12AT7, 12AY7. Hiwatts came with a 12AT7 in one position but it's very common to put a 12AX7 to get more gain, for example.
 
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