Capacitance of tone arm?

[gurevise]

Guys,
Do you guys know what the capacitance of the usual tonearm is?
I have old Linn Basik with old Basik LV X arm. Would you think that it is similar to capacitance of the one foot of cable?
I think, a usual SHIELDED cable is about 25...30 pf per one foot.
I need this to calculate the optimum load for my Shure V15 cartridge.
Let me know.
What you think guys.

Thanks
Sergey
Dayton, OH

 

[Brett]

I need this to calculate the optimum load for my Shure V15 cartridge.
Let me know.

Borrow, or buy a cheap cap meter and measure it.
Also try loading the Shure with 68k.

 

[sreten]

By looking at the tonearm cable and comparing to the specs
for different cable available from suppliers I estimated most
tone-arm cables used to be 200 to 300pF per meter.

I used to shorten them to fit the siting and then play with
adding capacitance to the amplifier input, you also need
to add the input capacitance of the amplifier.

🙂 sreten.

 

[hybris]

Gurevise,

Most Interconnects have 120 pF as a capacitance. And the inputs of amplifiers are appr. 100pF. The total amount of 220pF is precisely the advised value for Shures.

Values from to 400 pF will tame the high frequency resonance, so there will be a slight decrease of extreme HF when there is no HF resonance peak in the curve. But the usual midrange suckout will be cured. So the curve will be bettered a bit.

 

[Brett]

Most Interconnects have 120 pF as a capacitance. And the inputs of amplifiers are appr. 100pF.

Rubbish.
Having measured a few, tonearm cables vary in capacitance by quite a bit. The VDH ones that camoe with my Rock TT were over 400pF and they weren't a meter long. As most "higher performance" carts are MC, and therefore less affected by capaitance many manufacturers seem to worry about it less and design/spec cables for other parameters.

Ditto, the input capacitance of lots of phono stages, both hollow and solid state, varies over quite a range.

I use a Decca as one of my carts, so this has been as issue I've had to address to get excellent performance out of it.

Affects of loading on carts

 

[fdegrove]

Hi,

I use a Decca as one of my carts,

The Decca is a moving iron type of cart....

While I don't know how this type of cartridge is affected by a capacitive load, ( from passed experince with the Stantons, I don't it cares), the MM carts certainly are, MCs don't care as far as I know.

Cheers,😉