[sdiy] OT: Turnrable pre - converting from moving coil to magnet
JH.
jhaible at debitel.net
Tue Aug 18 23:54:07 CEST 2009
> So all these recommendations about replacing the stock cables to "better" ones on turntables, just making things worse ?
In my case, yes. But that's because the Goldring has an untypically high Inductance. This is well-documented, and the usual HiFi
babble somehow reflects it, in a way that "not every system harmonizes with every amplifier and every cable".
Well, it's not entirely wrong. :)
In my case, measuring the capacitance of that "High Quality" cable gave me the shivers, and all was clear. I told the shop, and they
said something along the line that I could upgrade to an even better cable, in the 10-times-as-much price range. I said thanks, I
used a 50 cents cable and that fixed it, too, and I replaced the input capacitors in my Sony amplifier, and now the Goldring sounds
superb. They didn't understand what I was talking about, obviously.
But I have no grudge, and I won't tell which renowned German dealer it was. I'm really happy with my turntable and MM system
purchase - it's just the cable stuff that was ... well ... funny.
If you want the best performance from a given MM system and a given amplifier, my recommndation is:
1. Get the inductance of the MM system from the data sheet.
2. Set up a Spice simulation with that inductance, a 50k resitor, and a variable capacitance
3. Optimize the capacitance for the best overall-response
4. Get the input capacitance of the amplifier.
5. Difference between optimal capacitance from simulation, and amplifier input capacitance, is your desired cable capacitance.
JH.
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