Atma-Sphere S-30 MK3

My Atma "resume": I'd used M-60s for a few years and upgraded to MA-1s almost a year ago.

Does the "hardness" occur at at both modest and loud volumes? Has it "been there" and "not" on the same recordings, but during different listening sessions?

Bill's comment about an OTL amps's "different presentation" likely gets to the heart of the matter, especially as this hardness manifests inconsistently. Atma-Sphere amps don't run with the herd. Transparency/accurate tonality and clarity are their strong suit, yet no amp is perfect in all qualities.

I've no experience with the M30, but compatible loudspeaker matching likely is more challenging given the lower power, as Emailists suggests. The overall "flatness" of your loudspeakers' impedance curve can also influence sonics when using OTLs. The power factor may manifest at higher volumes or with uncompressed and very dynamic recordings. The effect of unfavorable loudspeaker impedance peaks may be more evident on some recordings than others, as it would be frequency-related. But this is just my very speculative 2 cents...

Emaillists,
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Thanks for your input. The Tannoys are matching very well power wise. The version I have is the TW which has a 95db efficiency, an RMS rating of 110 Watts and a Peak power rating of 380 watts. Changing fuses is under consideration soon as I get a consistent performance.

AudioFeil,
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Like any other audio gear, the Atmasphere changes sonically during the break-in process but it takes quite a long while between these changes. I ordered it with the Teflon Cap upgrade, maybe that explains the unusual long break-in time..

Tom,
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This indeed is a coincidence!..I posted on Agon as I found more user discussions here on Atmasphere than anywhere else..:) I ordered the S-30 with the Teflon Cap upgrade, so maybe the Caps are the culprits till break-in is over. Maybe the MA units you heard also had these Caps installed. Maybe there weren't fully broken-in. I'm just guessing of course.

Recently, I also tried different interconnects and power cords but still this hardness existed. Mind you, it has greatly subsided but it is still there and noticeable and of course annoying..:) I brought over a couple of audio buddies and they too confirmed the phenomenon. Mostly very noticeable in a piano's mid to upper registers and the trebles in general.

This anomaly was also the reason why I experiemented with other 6SN7's but still no change, though the Tung-Sols were superior (to my ears).

Tom, thanks for the link. I'll check the thread and read the opinions there. I'm really hoping matters take a good turn soon as I really love this amp and love the way it reproduces the music. Thanks again for chiming in..:)

Best
AG

Nice amp you got there. There's one in my living room, too.

I haven't experienced what you describe during break-in, so can't make any suggestions on that topic.

However, I do have some experience in designing speakers to work well with the S-30 (as well as with other amps, but the S-30 drove the design). In my experience the speaker's impedance curve is a very significant factor.

I don't know what the impedance curve on the Tannoy Edinburghs looks like, but if it has a significant peak or two in the upper midrange or treble region the S-30 would put out increased power into that peak, especially relative to what a solid state amp would put out. And increased energy in the upper midrange and treble region can come across as "hardness".

Duke

dealer/manufacturer

Thank you for helping me understand Atma-Sphere products and break in Audiograils.

Your experience is most helpful.

Audiofeil,

I had no intentions to sound nasty or inappropriate !! I was merely saying that I noticed vast sonic changes during the break-in process of the amp in contrast to what you remarked.

" I suggest your ears were acclimating to the sonics and different presentation of an OTL amplifier. "

>>I couldn't agree more on this<<

Thanks for your input and my sincere apologies for the misunderstanding.

AG