| Ive used 6386 when building true balanced line stages and in reality there are several tubes out there that can be used, but it all boils down to the fact is that the dual triode sections need to match. I remember that there was trim adjustments in the Fairchild 660/670 for that reason.
what would be really cool is to come up with an auto bias scheme maybe with some op amps that balance the gain between the top and bottom tiode, therefore no calibration required.
I like the tone characteristics of the 60's NOS RCA 12AU7 built upon a true balanced line stage but I had to hand pick my tubes.
...What i mean about true balanced line stage is the positive signal input is going through active devices and the negative signal input is going through a mirrored set of active devices exactly like the positive signal path and none of the signal is truly referenced to any ac ground (dc supply or gnd).
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