intactaudio
Responses from intactaudio
| Phono Preamp. With transformer or fully active Ralph...Loading the transformer is well-known to control issues in the high end- the 'underdamped' part to which you refer. I do not consider loading of the secondary of a transformer an acceptable way to control transformer behavior. Of course t... | |
| Which cartridge ? The high purity copper coils do not change the internal impedance from 40Ω to 14Ω. The 103R has fewer turns of thicker wire and a stronger magnet to make up for the lowered output voltage from the reduction of turns.Dave | |
| Phono Preamp. With transformer or fully active With one SUT you can't use all MC cartridges, such phono stage is not universal for all MC. It will work for some of them nicely, but if your cartridge impedance is very low (2 Ohm) or very high (40 Ohm) you can't use one SUT for both of them. I'l... | |
| Choosing an SUT? I have not found the low impedance MI carts to be a good match with SUT's. While the reflected resistive load can be kept in line with what peter suggests, any capacitive load also quickly comes into play and causes a LC resonance with the cartri... | |
| SUT to MM cable? what should i get? cable mis-match In addition to short and shielded, low capacitance is critical. This is a high impedance node which makes it ripe for hum pickup and premature rolloff / phase issues from excessive capacitance.dave | |
| Cartridge loading Now, if someone can find International Audio Review 5, 1980 pp.31-159, the answer to the existental challenge of prove-it may be answered.Have a copy in hand.... which is why I took exception to the thought that loading a cartridge down must ad... | |
| Cartridge loading Raoul,Yes... I confirmed the results via measurement. I did not put forth any listening impressions.To be clear the stage that Lew M is using is not a current amp in the true definition of the term. Its circa 20Ω input Z is multiples enough of ... | |
| Cartridge loading Ralph,To be clear, a current amplifier does not significantly load the cartridge. The 'zero ohms' thing that you see talked about in reference to them refers to the virtual ground with which the cartridge plays a part.I built a spice simulation of... | |
| Cartridge loading I don't agree. Coil moving in a magnetic field can generate only one thing - voltage. This is the lesson of papa Faraday :)OK you win :-) Ralph... If I can ask you a question which might clear up a lot of things here....IOW when the cartridge is... | |
| Cartridge loading A MC cartridge is inherently a current generatorI want to be clear that I was not stating this as my belief but to point out it is an argument made for using a current amplifier rather than a voltage amplifier.My personal take on it is that the co... | |
| Cartridge loading Hey Lew.It appears as if this guy has a good take on what is going on with the 0Ωhttp://phonoclone.com/diy-pho4.html I quickly simmed the circuit and it appears as if the input Z is frequency dependent and around 0.001Ω @ 10hz and increases by a f... | |
| Cartridge loading As I have mentioned many times, the input impedance cannot be zero. If it were, you would have no output at all because the signal would be connected directly to ground. While it is true that no voltage can develop across 0Ω that doesn’t mean that... | |
| Cartridge loading To add to what I mentioned above, The big wrinkle that got me interested in all of this is the trend for current amplification that pops up every half a decade or so. The story goes something like this.... A MC cartridge is inherently a current ... | |
| Cartridge loading I think much of the issue here is confusing / lumping together the electrical and mechanical aspects of loading. Tracing high frequencies is a mechanical thing and while electrical loading will have an effect on this mechanical aspect, assuming ... | |
| Lyra Atlas SL Cartridge Magnet type?? for a given coil movement, cartridge output is simply the combination of flux and length of wire in that flux. In order to change one you must change the other to get the same output. The third side of this "triangle" is the cartridge impedance ... |