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RE: if 7B4 is the best driver tube for SE DC 2A3 ...

The 12BZ7 isn't really any less "linear" than a 12AX7. The curves you posted are almost exactly those of a 12AX7 but with "Ip" multiplied by 2. There's a reason for that. For all practical purposes, each section of a 12BZ7 is almost exactly a 12AX7 with both sections paralleled. 12BZ7 gm is double that of 12AX7, rp=1/2, If=2x, u=100, etc. If the 12BZ7 has a weakness compared to the 12AX7 it's excessive microphonics. Every one I've tried to use was a microphone. YMMV

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