atmasphere

Responses from atmasphere

Blown woofer from a bad tube? Is this possible?
Short answer: no.The speaker is damaged for other reasons. 
SET amp w/Neg feedback?
Rockadanny, it all has to do with the intention of the designer. In general, if the designer uses tubes its probably a Power Paradigm speaker he created. Voltage Paradigm designers usually use transistors. That will answer the question about 95% o... 
Riaa curve
Eldartford, when dealing with calibration of a cutting lathe, the speakers are not part of the equation. To answer your question to Raul though: we are, 'we' meaning the people who make this stuff to standards like this. 'We' say its bad when ther... 
Riaa curve
Eldartford, my cutting lathe has a set of 'pre-emphasis' modules that are in fact the inverse RIAA curves- if you put their output into a phono preamp, the result should be flat.It sounds to me that what you are getting at is that not all cutting ... 
Does this animal exist?
6SN7s have a Mu of 18-20- a bit lower than is practical for a phono section. The 6SL7, which is the high gain octal dual triode, can be a bit tricky as it does not sound like the 6SN7- it sounds more like a 12AX7, and is prone to microphonics in t... 
What amplification is best for JMLab Mini Utopias
The JM Labs have always been tube-Friendly...They seem to need a little power though. I recommend something that can make 100 watts or so. 
SET amp w/Neg feedback?
Jtgofish, if you have a speaker designed using Voltage Paradigm rules, then what you experienced is absolutely right. We have had similar experiences.A speaker using Power Paradigm rules will often work better, including the bass, using an amplifi... 
Berning ZH-270 Replacement
Hi Chris, if it were as simple as that! The Futterman is a 'totem-pole' circuit and is asymmetrical. Our amps use a modified Circlotron which is half the output impedance and *is* symmetrical. Futterman amplifiers usually have output coupling caps... 
SET amp w/Neg feedback?
Jtgofish, that is not entirely true, although there is a class of loudspeakers for which it probably is. see:http://www.atma-sphere.com/papers/paradigm_paper2.htmlfor more information.Negative feedback violates one of the more important rules of h... 
Berning ZH-270 Replacement
Bpinder, just a FWIW, This topic comes up again and again, and every time I wind up with a bunch of messages about the thread in my email box. I try not to respond unless there is just plain and simply misleading or outright false 'information'. T... 
Berning ZH-270 Replacement
Chris74, I humbly suggest that you have no idea what you are talking about. The output transformer in the Berning is clearly visible in the patent schematic! -even if you take the tack that an air core transformer is not in fact a transformer (whi... 
direct or not?
The usual problem that you run into is that most DAC/CD players have **way** too much output. The result is that you can usually clip the amp at volume settings well below maximum from the digital source- which will cause *serious* loss of resolut... 
Which tube balanced preamp good for modding?
Hi Allen, We're not aware of anyone doing that so far, but of course if they were they likely would not be talking to us about it. We've seen maybe two examples where someone tried to use your Super Reg circuit in the MP-1 power supply, but unfort... 
Preamp Deal of the Century
Jtgofish, so, has adhesive technology come a long way since the 90s as well? 
tonearms with VTA-towers for true "VTAF"
Axelwahl, if you are a mechanical engineer, then you would really appreciate how this arm is built were you to actually see one in person. It is the result of close to 30 years of refinement.You can adjust azimuth very easily- most arms have margi...