Problems getting the best out of my Berning

Ken I find many of your comments interesting. So far as sibilance is concerned I have often found this to be the result of interaction of components and wire and have experienced my share of it. I have never heard this emphasis through the zh270 or the previous Transcendent OTL amp I used. The system is wired with copper interconnects and Millersound speaker cable which is aluminum with covered with a copper flex wrap. I have been using the Millersound in my set-up since I had the Transcendent and it works extremely well to the point that I have stopped looking for "better" speaker wire after going through numerous ones.

The interconnects (Luminous Technology Synchestra Signature) were a notable improvement over the Harmonic Technology Truthlink. The Berning allowed me to hear that Truthlinks are intrinsically smooth sounding cables but somehow there is a sameness to all music, much of the subtle nuance of the performance is missing in action. As it happened a friend bought a pair of Luminous cables and his system transformed, I don't use the word lightly. There was that organic wholeness and a separation of instrument lines ala live music that you speak of that were revealed when one cable from the pre to the amp was installed. It was the most significant improvement I have heard his system make and this includes even swapping the Berning in. To put this in some perspective, he has tried numerous cables including MIT, Exos, Harmonic Tech Pro-Silways and Truthlinks, Tara labs, etc. each resulting in differences and some improvements in one area at the expense of another. The Luminous was a revelation and trying to analyze what happened took a back seat to listening to the music prior to which I had a difficult time doing with this system because I always was drawn to the artifacts of the reproduction, in a word, fatiguing.

I don't want to get into a cable review because my point is to emphasis not only do cables make a difference as you note above, they can make a DRAMATIC difference in bringing out not only the musicality of a system but the artistry of the performance. After hearing this in his system I did some research on the cable to see if there is a reason why it should make such a difference. Pretty straight forward, 6 nines continuous cast, (the truthlink are also continuous cast) with a special termination that may come into play. He brought the cable to my place the next weekend and while it didn’t transform my system like it did his, it was certainly a big improvement in the areas that I felt the truthlinks to be weak. Nuance or realness conveyed much better, which I attribute to greater resolution of harmonic detail, tighter and better control of bass, and probably the most notable, to me an incandescent, airy natural portrayal of the upper frequencies.

My litmus test of how my system is performing is massed vocal recordings, Ode to Joy Beethoven's Ninth John Elliott Gardner on Archiv is a good example. Nothing is more difficult to reproduce and very seldom do I get goose bumps listening to a choir on a stereo system. It is generally so far off the mark of the real thing. The speed I speak of with OTL’s and the zh270 is the ability of the system to reproduce instruments and vocals without overhang or adding a richness and to keep everything together yet to reveal the air, space, image focus and separation of the performers as we might hear it in a live performance. I would think if an amp is too fast, if this is possible, it would have the same effect as a tt platter going too fast, there would be a chance in the pitch of the instruments and voices. What could be perceived as artificial is if the dynamic shadings of the music aren’t keeping up with the above, this could certainly lend a perception of something being amiss. At this level of performance in an audio system, each element of the chain has to complement the others or whatever area has a shortcoming will draw attention to the whole.

Your insight was most welcome. I am currently going direct from the digital source to the amp. Prior to installing the Luminous cables, I was going from my CAT SL-1 pre to the amp and preferred it somewhat better with the truthlinks. There really wasn’t an earth shattering difference. With the Luminous cables there is a big difference and I much prefer direct. The presence on a great performance is palpable. Performances can swell you with emotion. It is a level I’ve never experienced before and it is consistent with music I love and the effect I get when attending a great live performance. I now realize that the pre-amp has to go and have just ordered a new one recently. I wasn’t particularly happy with the phono stage and the line stage is now just ok. I sure hope this new pre can keep up with what I am currently hearing. If I’m real lucky maybe it will be an improvement. What I’m really looking forward to is the phono stage. The bottom line with the zh270 is that I have finally found an amplifier that can showcase the potential of my system. Of course it doesn’t hurt that my speakers are a nominal 8 ohms with no dips that could alter the tonal balance. I generally prefer the normal setting with great recordings. I listen equally as much through the medium setting going back and forth often trying to decide. I only listen to the low feedback setting on overly dry recordings. As Peter notes, it is a bit too ethereal, not real but still pleasing. It’s nice having the flexibility. I sure would love to hear the Siegfried on Siegfried (Wagner’s)

Tubegroover and those interested.
Yes, I hear the improvements that the tubes make, yes, it's certainly a big hell of an improvement to me and most of those that hear it an have them, it's shocking how good but not everyone prefer it, believe it or not, some may want that glare, it's not a tube glare, it's a true glare, it's there in live amplified music, it's there in digital recordings.

One person preferred the stock tubes in all, a very small amount but still shows that improvements are a taste thing, there is no other explanation for it.

So to call it an upgrade, it would have to be better for everyone.
One thing in Audio I have learnt is, for every one thing a person upgrades to, another upgrades to the opposite, if you have speaker cable A, an you hear speaker cable B an love it, there is always someone that had speaker cable B and now loves speaker cable A, so the only logical explanation for this is personal taste but then I suppose there is no logic in audio :)

Peter, your perceptions of the effects of the cryo'd tubes match mine perfectly. I also have cryo'd NOS input tubes. I'm posting from work, so off the top of my head I can't remember the exact designation of them--G.E. 5 star platinum and Brimar Black Plates? I'm sure that the other berning owners will correct me. Anyhow, I got them from Tubeworld. If you contact him, the guy at Tubeworld (Brendan?) knows exactly what you want because apparently all Berning owners go for the exact same set of tubes. They were a little pricey, but as far as I know that is the only source. In my opinion, and I'm not sure that this opinion is shared by the other Berning owners, the cryo'd 6Jn6's made more of an impact. However, I have to say that at the time I was changing other system components too--interconnect, CD player--so I don't have a very good baseline to compare them to.

Peter, check out my 2nd 9/26 post it gives the tube set. I certainly hope matters improve with the amp. I really don't think the inputs will change any of your general perceptions. Since you have had the tubes checked and they are fine my guess is you have either a break-in issue or a serious synergy problem. What you are describing I can't remotely attribute to this amplifier. It is the antithesis of fatiguing or tonally out of balance, especially with an 8 ohm load like the Pro-acs. I am also familiar with the sonic characteristics of the ARC and Pass amps you speak of although not in my system nor in yours ;^).