Frustrated with new pre-amp and need advice

Let me first say, that there's a good chance I'm not reading what you posted correctly.
It's been my experience that it's always a good practice to lower the volume to zero before switching sources and turning off the unused sources.

Unsound you are correct, that is what we were taught but you don't have to go down to 0. Go just low enough that if your preamp generaes a popping noise or pulse surge it won't send through your amp. This usually does not happen in tube amps. If your gear is designed properly, grounded properly and better than good quality components are used you should neer hear crosstalk or have any popping noises, etc. Oh, and a good power supply should be included on the list too.

Sounds a lot like this thread: http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1263135229&read&keyw&zzpreamp+pop+source

If it's same manufacturer I'd tread carefully.

Were I in your shoes, I would return the item for either a replacement unit or a full refund with preference toward the refund. Unless the unit is faulty, your use of an alternate pre proves there is something about the unit in question that makes it incompatible with your existing equipment. Good luck.

If the co. has a very consumer friendly stance, asking and getting a replacement unit this early on ought not to be an issue. Even if it’s mentioned some more run in time is required first.

A second same unit will do one of 3 things… alieviate the issue entirely, or determine it is a mismatch for your current setup or lastly, some revision is necessary to the current production models.

Each of those items ultimately formulates into a win win situation.

I don’t use all the inputs on my tube preamp. It has 4 pairs/sets. It is SE only. Normally I’ll use two. A while back after reconfiguring sources on the preamps inputs I mis-selected one of them. I forget exactly which one the selector knob was set to, and while in the other room used the remote to raise the vol. Both sources were on at the time too.

I kept raising the volume and could only faintly hear any source material. Turned out the knob was on a blank spot and the source I heard was on the adjacent or next position over.

So indeed there was some bleed through that could barely be heard yet the volume level to encounter this anomoly had to be at near the max setting.

Once previously on a 100% balanced preamp this exact same thing occurred. In both cases I feel I was very lucky.

During normal operating levels, all other sources were/are inaudible. Again, only when at the near full on vol level or at full on was anything at all audible from an adjacent source selected position… so we’re talking extremes here.

Not just run of the mill routine operating procedures.

I’ve had several preamps and amp combos in here… with some being quite inexpensive and some being very expensive. In none of those mixings have I ever had any bleed thru from one source to another aside from my above accounts.

Lastly… a brand new preamp… SS or tube… should not induce any thunks or plunks audibly to the speakers when sources are changed, especially if prudence with the volume is in force during the source changes… or at least I’ve never experienced such things with any pre or even proc I’ve yet owned..

Hopefully your brand will see to it you are treated fairly and satisfied very soon.