atmasphere
Responses from atmasphere
| Listener fatigue: what does it really mean? Csontos, you put your finger on the leading edge of what is possible with transistors.Here is one of the difficulties you are dealing with. Transistors have a non-linear capacitive aspect inherent in the junctions of the devices. In fact some semi... | |
| Bass leaves after amp warms up? Kijanki, its not about incorrect bias. Its about current limiting due to temperature.I always liked the MOSFET and later types of amps over the earlier bipolar designs because they sounded smoother. But one thing I didn't like about them was that ... | |
| Listening fatigue Here is some additional information on lister fatigue that I have copied from the Teck Talk forum:"Listener fatigue is nearly always a consequence of distortion.Two distortion sources are IM distortion and odd-ordered harmonic distortion. Both are... | |
| Using autotransformers Al, we use such a device in our MA-3 amplifier http://www.atma-sphere.com/Products/#MA-3Otherwise the amp would draw the line voltage down in a lot of situations and not make full power.Depending on the power requirements you might be able to use ... | |
| Listener fatigue: what does it really mean? Csontos, you are spot on.The specs an amplifier has on paper don't reflect the whole story though. An amplifier with very low distortion with steady state signals (sine waves, used to test for distortion) can act quite differently when asked to re... | |
| Stand out phono stages Lacee, there is a simple way to drive any power amp in the differential domain. Most designers don't know their amps have the capacity and so don't provide the connection. PM me if you want more details, or perhaps we can discuss it in a different... | |
| Bass leaves after amp warms up? The complaint is one I have come to associate with MOSFET output transistors. A small fan can indeed help. The amp may not run all that hot but MOSFETs have a quality where the warmer they get, the more they limit current. So you want to keep them... | |
| Listener fatigue: what does it really mean? Listener fatigue is nearly always a consequence of distortion.Two distortion sources are IM distortion and odd-ordered harmonic distortion. Both are known to be irritating to the human ear- and this has been known since the early 1950s. What is le... | |
| Using autotransformers The term 'autotransformer' is a new one on me, and I have been a technician and engineer since 1974. I suspect that you mean something else. Which of the two below seem like what you are looking for?An autoformer has no ability to regulate voltage... | |
| Stand out phono stages I prefer a phono section that is balanced so I don't have to worry about colorations from the phono cable. Phono cartridges are a balanced source so its nice for the preamp to accept the signal in the balanced domain. The balanced line system was ... | |
| Interconnects Roller Coaster Ride I would expect that line voltage variation would affect your preamp, amps and speakers.It might be a good idea to get a voltmeter in the same room with you. If the system is sounding good, make a note of the line voltage. Do the same for when it i... | |
| A good amp for Tannoy speakers The speaker is very tube-friendly but it is also critical of the amp driving it. In addition I found it sensitive to the speaker cables! - literally meaning that I got bass with some cables and not others. Keep the cables under 5 feet in length an... | |
| D-Sonic peak current output compared to other Simon, I think we are on the same page- IMO, distortion is pretty much the name of the game!It turns out that the ear hears distortion as tonality. This is why SETs sound so lush, because of that 2nd harmonic. Its been my experience that if the sy... | |
| D-Sonic peak current output compared to other Simon, I noted the last comment in that article. You might be interested to know that there have been studies of how the brain reacts to music- and where that music is processed.The studies were conducted by Dr. Herbert Melcher, a neuro-chemical s... | |
| Phono interconnect under $500 used Hello Halcro, not exactly. What I am saying is that the interconnect cable between the arm and the preamp will thus cease to impose a coloration. Some might interpret that to always be 'better/purer' if they are indeed in search of neutrality with... |