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In Reply to: What kind of cartridge, Pat? posted by jj on November 21, 2002 at 21:26:53:
I have a Grace F9E.The Quad preamp is spec'd for a phono input impedance of 47K, with a choice of adding in 180 pF capacitance, which would be in addition to whatever the phono cables had. The extra capacitance introduces a roll off in the FR, about 5-6 dB at 16K if I recall, which generally sounds way too dark. In any case, the phono cable I tapped on is on the outside the TT, a Denon DP-60L, which Dougman says is fine, BWT. If I tap the cartridge or tone arm, of course I can hear something.
Now, if I had a low output moving coil, which requires more gain, perhaps I would hear something. Quad used to have different input modules available for moving coils, and they may still be available.
2.2 meg? Gee, my Radio input is only 1 meg; CD input .5 meg; the rest are about 100,000 ohms (varies somewhat with the input sensitivity, which is adjustable). I really don't know anything about the availability of ceramic cartridges or replacement needles.
____________________________________________________________
"Nature loves to hide."
---Heraclitus of Ephesus (trans. Wheelwright)
Follow Ups:
The lowest of the two impedances the cable see, is normally the source impedance, say 1kOhm for MM, down to 2 Ohm for MC.The source impedance load down the cable's generator, which is a high impedance generator.
Microphones often have 600 Ohm source impedance and low levels, making this cable microphonic effect audible.
Preamps and CD players have from a few Ohms to 2kOhm source impedance, but much higher levels, and thus relative less audible effect of microphonic cables.
I have no idea what the source impedance of a Grace cartridge is.What sort of magnitude are cable microphonics?
____________________________________________________________
"Nature loves to hide."
---Heraclitus of Ephesus (trans. Wheelwright)
Ole is correct. The Grado cartridge is low Z.
Well, I do own a Grado cartridge, but I no longer use it. They are supposed to maintain their FR pretty well into various capacitances, as I recall.I currently use a Grace F9E. Is it low impedance, too?
____________________________________________________________
"Nature loves to hide."
---Heraclitus of Ephesus (trans. Wheelwright)
I don't think so.
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