Advice on an upgrade

dennis, i have no doubt that the VTL intregrated is warmer than your NAD with these speakers - i would think the NAD's were never a proper choice for them. that doesn't mean in any absolute sense that they have a warmish tone - that effect has everything to do with the speakers they work with. You must think of the speakers and amp synergy - next to your room and placement this is of prime importance. there are a lot of conrad johnson models about - they all sound different to some degree - the tube models are usually warmer than the ss - all would be an upgrade IMHO. but thats not the point, from my view its the sonic signature of a warmer amp you want to hear so you can decide which direction you want to go, then pick the exact make and model. CJ just came to mind as an example of warmish amps that don't compromise a lot on providing you with detail etc. however, as a practical matter, they have some highly regarded models that are easy to use in that you can change and bias the tubes yourself when this becomes necessary, therefor are much cheaper to maintain and experiment with. you must have a cj dealer somewhere in DC you can get a loaner from. i would try to get the 11a or the cheaper 55 just for a peek. have fun.

Synergy over price/reputation. I understand that. I'll look into CJ auditioning possibilities. Thanks.

1. Get a Supratek Chardonney line stage (sse thread here under "Preamp deal of the century" for $2200. Don't even think about it, just do it.

2. VAC 70/70 - nice piece (Mk I,II or III?). But remember, you are stuck with the VAC-distributed Chinese Golden Dragon 300B's in push pull configuration, so upgrading to WE300B's - which would be great - would be muy expensioso. Instead, if you like VTL, get a 175 Signature with 807 output tubes. These were made at one time, but now are special order. $2200-2400 used. Very nice amps a steal at used price. Saw it easlily driving a pair of hard-to-drive Acoustat 1+1 Electrostats. Hard to find because so good for $, but look with patience.

3. Consider Berning ZH270 amps, singly or bridged. Ask other people about them and you'll see the big response. Hard to find used for that reason.

4. AirTight EL-34 based amp would still be nice.

VTL85 may be forced to use 6550's because of price constraints, but avoid that tube in higher powered amps.