Hello. I measured capacitance cables just to get me my turntable doubt its value. Result 180 pF.
As my pickup is Audio Technica AT 440 MLa which requires a load of 100 pF (including cable), I see that only the value of cable capacitance, I'm well above the desirable.
Moreover, Calvin has suggested LT Spice simulator software. With him I started playing simulating my phono pre diy with AT 440MLa values.
I have concluded that the proper charge for an extended frequency response with 82kohms and 90 pF.
Newbie question: I can assemble with RG6 coaxial cable?. My idea arises because it is shielded with copper braid and foil Cable; polyethylene dielectric; low resistance and 50 pF per meter. Or is that a cable of 1 meter and a half have 75 picofarads.
Greetings and I hope your answers. Joseph.
As my pickup is Audio Technica AT 440 MLa which requires a load of 100 pF (including cable), I see that only the value of cable capacitance, I'm well above the desirable.
Moreover, Calvin has suggested LT Spice simulator software. With him I started playing simulating my phono pre diy with AT 440MLa values.
I have concluded that the proper charge for an extended frequency response with 82kohms and 90 pF.
Newbie question: I can assemble with RG6 coaxial cable?. My idea arises because it is shielded with copper braid and foil Cable; polyethylene dielectric; low resistance and 50 pF per meter. Or is that a cable of 1 meter and a half have 75 picofarads.
Greetings and I hope your answers. Joseph.
RG-6 is a bit overkill, not to mention inflexible and difficult to wire into an RCA connector. If truly concerned over lead capacitance use some oscilloscope probe wire. About 18pF/M. Has tiny centre conductor specifically to keep capacitance low. But best answer is to mount a phono preamp right in turntable at base of tonearm.
Doc
Doc
Thanks for the information.
On the turntable there is no place to mount preamplifier board and PSU.
But I'll see if I get cable oscilloscope probe.
Thanks Jose.
On the turntable there is no place to mount preamplifier board and PSU.
But I'll see if I get cable oscilloscope probe.
Thanks Jose.
Hello. Roxbrough, you're right. The turntable cable came with a common look and apparent low quality. So I'm looking at forums excited to build one with gold plated connectors; -looking "hi end".
When I bought a measuring capacitance I realized the extent of the cable that I built.
"180 pF at 80 centimeters."
Yesterday I found the original of the turntable, medi capacitance and "1 meter 45pF"
Result, then replaced the old cable (1982).
Greetings and until we get a proper cable will not change it. (I saw on Ebay a cable with 4PF / m).
When I bought a measuring capacitance I realized the extent of the cable that I built.
"180 pF at 80 centimeters."
Yesterday I found the original of the turntable, medi capacitance and "1 meter 45pF"
Result, then replaced the old cable (1982).
Greetings and until we get a proper cable will not change it. (I saw on Ebay a cable with 4PF / m).
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