tvc vs avc


from a practical standpoint, what is the difference between a transformer vs autoformer based passive volume control? Bent Audio has moved to Slagle autoformers to replace the unavailable tx 103 S&B transformers, and apparently thinks they work at least as well.
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Interested in knowing if some of you have had the chance to compare since the last post. I tried the Bent Tap-x before with the AVC and liked it better than an S&B passive I tried, but it wasn't a Bent NOH or TAP. Would appreciate additonal comments on the the TVC AVC differences. Hi Teajay - yup, still trying new stuff.
Has the passive pre hysteria gone away? Are we all back to our glowing tube preamps?
Well for what it is worth I bought a Berning Micro ZOTL to use as a headphone amp. As luck would have it the one I bought could also be used as a line stage preamp, as well as a 1 watt amp.

I've been using it as a preamp for a month or so now, alternating between my other passive preamps. I still prefer passives and will be getting another one that is balanced, but this Berning has really made a nice difference in my system.

I hope to be getting my custom EL-84 amp this week and will be setting up a second system with the Berning and a pair of Tonian Lab TL-D1 speakers I just purchased. Source will be a Kenwood KT-8300 analog FM Tuner to start, then a computer audio set up when I get around to acquiring the components.