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

Posted by Steve O on March 2, 2017 at 08:29:45:
There are minor differences in the curves, mostly at extremes. In part no doubt an artifact of manually fitting a smooth curves to discrete data points as was done in those days.

My experience with 12BZ7 was in an attempt at improving drive capabilities of two traditional PP driver topologies that utilized 12AX7: Mullard circuit and gain stage direct coupled to split load inverter. In both situations the sound was pretty much same as 12AX7 but didn't do much serious listening before moving on because of microphonics. Maybe I had a bunch of bad examples of the type. Maybe they'll work out fine in your apps. Fortunately they're still inexpensive so no great loss if they don't work out. As always with tubes like this, YMMV.