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In Reply to: RE: if 7B4 is the best driver tube for SE DC 2A3 ... posted by Steve O on March 01, 2017 at 21:51:36
I disagree with you, I do not think the graphs are similar.
But the graphs, and " maximum swing analysis " are NOT the sole reason to use, or discard, any tube. There are other factors one must weigh. The less-linear graphs I see, won't stop me in my intended use of the tube, one time in my audio chain.
In what gear were you employing the tube, preamp or amp, may I ask you ??
How many stages, one, or more in series??
Aside from microphonics, how did it compare to a 12AX7 sonically-speaking, in your circuit, and from your direct experience ??
Thanks in advance.
Jeff Medwin
Thanks,
Jeff Medwin
Follow Ups:
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.
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