Does a tube preamp warm up sound of SS amp?

The Bryston has a lowish input impedance on its XLR inputs, 20K Ohm per phase (it's common to give the sum of the phases in spec sheets), making it a poor match for some tube pre-amps with high output impedances.

The single-ended input of the Bryston is 50K Ohm, which will work with more pre-amps, but I'd still avoid very high source impedances (say 1000 Ohm and above).

If you want more flexibility, I'd look for an amp with a higher input impedance like 100K Ohm.

"my BAT preamp with the 7BSST amps and had no problems". The 3iX has a pretty high output impedance compared to the other pre-amps in their line.

http://www.balanced.com/products/line/specs.C.shtml

However, I'd be willing to bet that you are getting some low frequency rolloff if you are using the balanced input of the Bryston. You will hear low bass because it's a gradual rolloff. It's something you might not notice until you try an amp with a higher input impedance.

"From what I think you're saying that ARC could work, right?"

Yeah, I saw that on ARC's site. But that's the minimum, not necessarily the optimum load.

Well, VK from BAT just pointed out that I'm all wet in another forum.

However I did my measurements before, I obviously did them incorrectly.

Feeding the balanced input of my Bryston 3B-SST from my BAT 3iX, I just measure the output from the speaker terminals with a voltmeter (HP 400E), and it stays within .25 dB down to about 50 Hz, and is down about 2 dB at 20 Hz. Not optimal, but probably not that audible a rolloff.

My apologies to everyone for the confusion.

Now that I hopefully have my head out of my ass, the answer to the original question is: yes. A neutral SS amp will let the warmth of tubes come through, particularly if you choose some good NOS tubes.

Are the 3.6s too hard to drive for a tube amp like the Rogue M-150 monoblocks? I prefer the Rogues to the BAT VK-250 recommended by another poster, and the Rouges are cheaper.