K&K Audio / Lundahl Transformers

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RE: For Sale! Cheap!

Posted by nerdorama on June 5, 2016 at 14:13:03:
Hi Kevin,
It appears that the LL1689's, either pair, might be good for a balanced line stage similar to the one on Lynn Olson's page. What might be the advantage to the "Z" version, if any in the real world? Can I assume that higher inductance might help it to match better with a tube of somewhat higher plate resistance than the 5687 family tubes in Lynn's circuit? I've had a long term interest in this sort of line stage as my power amps that have used balanced PP transformer coupled stages have been very pleasing. I don't see any specs for the "Z" version in the datasheets. Any idea of the primary inductance? How much more closely would the tubes need to be matched with this version?
Thanks,
John