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In Reply to: Jolida JD9 technically demystified posted by KT88 on December 16, 2005 at 13:33:21:
including using HI OUT @ 70 dB gain or LO OUT @ 85 dB gain and adjusting for bass/treble using capacitance/impedance tuning. I haven't figured out which I prefer with the Eroica but it's fun experimenting with it. For now I left it at HI OUT, 70 dB gain, 1K ohm impedance, 100 pF capacitance.Thanks again for providing additional information in this and your previous post. (You too, bjh.) I find it helpful in understanding the circuitry and the relationships of each phase of amplification. Hopefully others will too after all the strife my questions seem to have stirred up.
Follow Ups:
Your settings are probably correct as verified by your ear but I would advise to eliminate capacitance by setting it to zero. Moving coil cartridges should not be effected by capacitance at that level at all so you would get a slightly more transparent sound by eliminating it completely.
-Bill
but to avoid adding to the complexities of multiple iterations (and my confusion) I was staying within the suggested capacitance range (100 - 500 pF) for the Eroica H. Of that range, the 100 pF sounded best. I did lower the impedance loading based on suggestions that impedance output be roughly 10 to 20 times the input, which for the H version is 77 ohms. I found the sound to be more pleasing than at the default 47K ohms. It may be that the cartridge is still new enough that it's still a bit bright and dropping impedance helps.Now that I have the gain and impedance figured out I'll try the zero capacitance setting for comparison. This phono stage facet of analog sound is fascinating and "a whole lotta fun!"
Tom
PS: I did a search of amplification/passive/active/buffered/tubed/ss etc. and found a wealth of, well, opinions. Seems that people have a very wide range of experiences, knowledge, and personal listening preferences. Even the so-called "experts" don't agree on the different applications of solid state vs tubed, minimalist circuitry (or "clean" as some consider it) vs "colored" buffering (or distortion as some consider it). I've tried to come at this upgrade process with an open mind, seeking the knowledge of others and appreciating their opinions. But I'm also keeping my past 35 years of vinyl listening in mind as to my own personal preferences for stereo sound. Last night, armed with newfound knowledge and understanding, I had a blast messin' around with the settings on that JoLida phono stage.
They may mean total capacitance which would include that of the tonearm cable. So you probably already have 50-100pf in-line. But actually I am surprised they spec any as it does not matter for true MC cartridges. I'll bet they just through that in there (along with the 47k spec) so that the average guy with a phonostage would feel comfortable with the numbers; i.e. marketing BS.
-Bill
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