Azimuth adjustment using Oscilloscope

Posted by Ungie (M) on May 16, 2009 at 10:35:29

Hi everyone,

I have finally got around to checking my visual azimuth setting with a test LP and a digital oscilloscope. The nice thing about this scope (Tek TDS360) is that it can measure the voltage for you while you look at the traces. Makes it much faster when you have short 1kHz left and right bands. I noticed that with my visual azimuth alignment that I was reading 110mV right channel crosstalk and 75mV left channel crosstalk. I tried slowly changing the azimuth bit by bit on my VPI JMW 12.6 arm and found that as I tilted the cartridge by adding more mass on the "right" side the crosstalk voltages reduced but the left channel crosstalk waveform became very squished as if the top of the wave was being clipped. The right channel crosstalk always remained looking like a sine wave. Does this make sense?
I should note that I was measuring at the tape out of my pre-amp and I swapped the input channels to my phono stage a few times to insure that there was perfect channel balance though the rest of the chain.
Also the output voltage of each channel was reading about 1.82V while those crosstalk figures were measured.
Can anyone shed any light on this?
I'm a little bothered that to get the lowest crosstalk figures that I needed quite a bit of tilt and visually it looks quite a bit off compared to my visual alignment.
Thanks for any light that can shed on this!

Andrew

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Topic - Azimuth adjustment using Oscilloscope - Ungie 10:35:29 05/16/09 (7)

RE: Azimuth adjustment using Oscilloscope - Karma16 09:45:39 05/18/09 (0)

One minor suggestion - kavakidd 15:13:05 05/16/09 (0)

I've also been exploring this kind of stuff recently... - John Elison 13:28:02 05/16/09 (4)

RE: I've also been exploring this kind of stuff recently... - Ungie 07:44:00 05/17/09 (1)

Very Interesting.... - John Elison 08:59:50 05/17/09 (0)

RE: I've also been exploring this kind of stuff recently... - Ungie 14:37:29 05/16/09 (1)

RE: I've also been exploring this kind of stuff recently... - John Elison 16:53:27 05/16/09 (0)

Azimuth adjustment using Oscilloscope

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