Push-pull Tube Amps and autoformers

@audiodidact I think the best way to use the ZEROs is to use the 16Ohm taps on your Quicksilvers if they have one.

Then use the ratio on the ZEROs that seems to sound best. Keep the speaker cables as short as possible and as heavy as possible between the ZEROs and the speakers. You can use longer cables between the amps and ZEROs and they don't have to be so heavy.

This might give you more bass extension since most output transformers become less efficient when using the lower impedance taps and they often lose low frequency bandwidth at the same time. You might also get less distortion- if so the system will sound less bloated, more relaxed and you might hear more detail.

If you add a crossover, you can roll off the bass on your Maggie’s at around 60hz and add a subwoofer that rolls in at around 50hz, you’ll have more than enough power to make those Maggie’s sing and I mean sing loud!

All the best.

@atmasphere, Thanks for the encouraging words, however, the Quicksilver M60 only has 1, 4 and 8 ohm taps. Is that end-game?  

@audiodidact with your particular tube amplifiers you do not need the Speltz Zeros, as I am surprised Ralph is saying it is ok. They were created for OTL amplifiers. If I am understanding you correctly, I agree with audiotroy. Get a robust and beefy solid state amplifier " that you like " to drive your Maggies. There are some speakers that do better with the muscle of a great solid state amp. Enjoy ! MrD.

@mrdecibel and @audiotroy, thank you both for the heads-up. I’m aware that the Zeros were initially meant for OTLs (I noted such above, in my opening post), but I did speak with Paul Speltz and while he is not promising anything, he felt it would be worth trying to see if the Zeros might help the QS with the Maggies. I actually have a pretty beefy SS amp (Parasound A21+), still in the system, that I switch between it and the QS with a Luxman switcher. The QS produces a lovely detailed sound at lower listening levels, especially at night (I’m talking 65-70db). The SS is for everything above 80db when I want slam. The Zeros may very well not pan-out, but they’re on their way and I’m going to try them at various taps and settings and see what happens. And i’ll be quick to post the results, whatever they are, good or bad, when I’ve finished.  Yes, I hope to get just a teeny bit more from the tubes, and yes,  it just may not be in the cards, but the proof of the pudding is in the actual eating, so, I’m going to take a bite and see for myself, though I had initially hoped to find  someone here who’s actually tried something like this. But, thanks again, everyone!