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RE: Which Lundahl line out for bass preamp?

Posted by KevinC (M) on May 10, 2016 at 14:55:16

In Reply to: Which Lundahl line out for bass preamp? posted by andy evans on May 10, 2016 at 13:39:15:

That's a tough application for a transformer due to the high plate impedance of a 12AX7 in grounded cathode connection. The bass register will suffer the most, ironically, right where it will sonically hurt the most. I couldn't recommend any transformer I know of for that job. Whether it's parafeed or series feed, you would need to have a plate impedance closer to 20K to make a full bandwidth output stage. Of course, you could build a two stage 12AX7 amplifier with global feedback to drive the transformer....like much of the 70s tube gear (without the transformer, of course!).

Kevin Carter
K&K Audio
www.kandkaudio.com

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