Gonk,

thanks for coming through; I knew you would.

Yes, it's a beautiful pre/headphone amp. I lucked out, purchased it used from someone that was dissatisfied, in part, because he was using the wrong input tube for the headphones he had.

Yes, I've come to the same conclusion; it's a problem in both directions, both with the ZD and with the 990. I think the only way I can use both is with a switch within the amp, which changes inputs and that makes it way too complicated; it already is.

I wish you could have heard my old speakers, driven by that tube pre. I'd invite everyone to hear it, if I could figure out how to marry everything together. I'm afraid the only solution is to pull the main speakers out of the surround setup, separating the two systems.

On the other hand, I've come to appreciate the detail and precision of quiet listening over the original intention of these speakers, which was/is pure American hot rod; but what a joyful hour it was. A day later, I think my ears are still sore, still ringing. Sorry ... getting carried away.

In any case, it's not going to work, combining the two. It’s either one technique/approach or the other.

Again, thanks Gonk and how are you? I tried pm'ing you, but your mailbox is full.

John