wynpalmer4
Responses from wynpalmer4
| Cartridge Loading- Low output M/C Thanks, that's useful information. I have a good, old, friend that's a hi-fi reviewer in the UK and also is part of the team that produces the "Chasing the Dragon" series of recordings. We have arguments about this all the time as he feels so sure... | |
| Cartridge Loading- Low output M/C Yes, it really is back EMF- it's calculated using Lentz's law and is a consequence of Faraday's Law of Induction and it occurs as a result of the change in current through the coil- that's where the frequency dependent term comes from (the derivat... | |
| Cartridge Loading- Low output M/C Yes, it has been quite interesting and informative for neophytes like myself.By the way, I constructed a model for the cartridge back EMF using Lenz's law and incorporated it into my simulations.For those who are interested, the simplest version o... | |
| Cartridge Loading- Low output M/C What I don’t understand is why any of the purported effects of heavy resistive loading you state could be definitively true- certainly not on tracking which is demonstrably false based on IM tests on tracking performance that I have incidentally p... | |
| Cartridge Loading- Low output M/C Well, I once was the proud owner of a couple of quads- the original ESL-57 and a pair of ESL-63s that I also pulled apart- their delay line/filter design to drive the annular segments was quite neat. However, I had serious reliability problems and... | |
| Cartridge Loading- Low output M/C OK. Thanks for defining what you mean. So lets look at power. I ran a simulation and calculated the power dissipated in the cartridge series R and the load R and plotted what happened to the total power as the load cap is varied. The voltage and c... | |
| Cartridge Loading- Low output M/C By the way, I still have no idea what you mean by energy of the cartridge itself etc. | |
| Cartridge Loading- Low output M/C With the measured cartridge/minimum input cap (85pF) the response with a 47K R has a 29dB resonant peak at 4.3MHz and is -12dB at 10MHz.With a 1k load it’s 4.2MHz and 9.5dB.With 250 ohms it’s basically flat to 5MHz, with -14dB at 10MHz.with 100 oh... | |
| Cartridge Loading- Low output M/C I measured the inductance- cartridge plus interconnect to phono input on preamp.The total was 11.8uH. The capacitance was 51pF. including the preamp input the capacitance was 205pF. Excluding the input load cap it's 85pF.I'll use those numbers and... | |
| Cartridge Loading- Low output M/C I just measured a cartridge I have it's 10.7uH, 16 ohms DC.I'll resimulate with that and see what happens. | |
| Cartridge Loading- Low output M/C Sorry, a typo. It was meant to be 0.5mH. The simulations were all done with 0.5mH- note that the roll off calc for the RL was done with .ooo5H. I can perform the sims for any set of values you choose, and if you care to do so I would be obliged to... | |
| Cartridge Loading- Low output M/C Direct driving your ESLs? I'm sorry, but I don't know what you mean.I use Rogue M180s to drive my Montis, which is interesting as the Montis are, of course, capacitive above the woofer crossover with an impedance of, if I remember correctly, 0.9 o... | |
| Cartridge Loading- Low output M/C The idea of driving a cartridge directly into the virtual ground of an amp either just using the amp input impedance (such as a grounded base transistor) or via a resistor is hardly a new one. Some of the earliest solid state phono stages did exac... | |
| Cartridge Loading- Low output M/C Actually, adding an additional pole can be as simple as finding a bias/protection resistor in series with a high impedance node in the signal path then adding a shunt cap to ground. For example, in the AD797 opamp based MC phono stage in AudioKarm... | |
| Cartridge Loading- Low output M/C No, I did not design the AD797. That was Scott Wurcer- a colleague at ADI and, incidentally, for whatever it's worth, also an ADI design fellow. However, I know the design quite well.He and I were colleagues in the opamp group in the 80s. He focus... |