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Question on Pass Labs Xono - John E. or others

Trying to determine proper resistance loading for my Pass Labs Xono and a Lyra Etna MC phono cartridge. What is the measured input capacitance of the Xono phono stage set to moving coil?

I measure a total capacitance of about 725pF from the cartridge phono connectors on the right channel red and green tone arm leads (cartridge disconnected). So that total includes the tone arm IC cable (Discovery Cable?) in a Triplanar VII arm plus the Xono phono stage input capacitance that's connected to it and turned off.

This seems pretty high. The Lyra instruction table for cartridge resistance loading only goes to values of 600pF (It specifically states it's a combination of tone arm cable plus phono stage input capacitance) and notes that the pF of the phono stage should be minimal with most of the capacitance expected in the tone arm cable. Standard tone arm wiring capacitance should be 100pfpF per foot or less.

I double checked that the Xono cartridge dip switch was set to MC and all the loading capacitance value switches were off. I also zeroed out the effect of the capacitance meter test leads before I connected them to the tone arm connectors for measurement. I double checked polarity (shouldn't matter).

I can measure the phono stage alone, call Kent at Pass Labs, etc. but am wondering if I am missing something. Something here does not seem right.

Thanks for your help!




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Topic - Question on Pass Labs Xono - John E. or others - Barry 14:54:33 11/26/15 (4)

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