Zero Feedback: Atmasphere vs. BAT


Do Atmasphere and BAT have similar sound because they both use low or zero feedback tube designs?

I am considering these amps for my 8 ohm 89db Spendor S8e's.

I am looking for smoothness, Transparency and sound on the warm side. I am leaning toward a BAT VK75, it can be upgraded and it runs AB instead of the hot class A. You can also upgrade to VK 150. From what I can gather the 140 watt MA1 is superior in the area of dynamics, that would be the main reason to go Atmasphere to the best of my knowledge as OTL is super fast and more of a rock out style.

I am looking for used gear that can be supported over the long term by a good company.
128x128scottlanterman
It has been about 4 years since I have heard the BAT gear and perhaps it was poor synergy, but it sounded lean and a bit veiled to me. Many amps claim to sound like SET amps. SET amps sound like SET amps. Why buy a BAT and change the coupling caps and hope for the best when Scott could buy the Atma and the Audiokinesis and know he is getting excellent synergy?

I think the real question is whether Scott wants "warm and smooth" which means an el34 or 300b topology. Scott, I recommend the Atma/Audiokinesis if you are unable to audition. If you are able to audition, I recommend that you listen to BAT, Atma, an el34 and a 300b along with the appropriate efficiency speakers. Or, be patient and buy used gear and resell what does not float your boat. Good luck, Jeff
I lost count how many amps I have bought and sold in the past 10 years, but one thing I can say confidently is a stock BAT 75SE is not veil or lean. in fact, it's much more transparent than just about anything else and that's where I stopped. well, I did upgrade to 150SE.
A couple of years ago Nelson Pass (check out 1st Article on website, seems a must read for audio geeks) wrote on the subject of zero feedback. He talked about the distortion spectrum between an A circuit running zero feedback, and an AB running zero feedback, as well as the whole feedback concept creating less total distortion, but more of the complex unpleasant type. This was also covered in Stereophile, as they were gushing over a Cary 803C amp and zero feedback CJ Pre. In the back of that article the designer of the CAT Pre tried to inject some sanity in the conversation by saying it is not sooo simple.

Since I cannot listen to all the equipment in the world, I was wondering how BAT compared to Atma? From what I can tell their are fans of both with Atma perhaps being more trasnparent.

Still comes down to "Gold Plated Decibels" as a key factor if you want to have a class A set up, you gotta have effecient speakers if you want the option.

Thanks,
Scott
"...if you want to have a class A set up,you gotta have effecient speakers if you want the option."
I beg to differ.
Sorry about that Unsound.

You can purchase a Krell KSA 200 or a Threshold, or a Pass XA200 or something else in the BIG Class A Tube range like TRL Tube amps ot ATM1.

It's a lot of energy and possibly big upfront cost going that route. I stand corrected. Still looks like "Gold Plated Decibels" when you factor in your energy bill and a lot of heat in the summer if you go big class A.

Best Regards,
Scott