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Turntable Oscilloscope Readings

After setup of my cartridge, I used an oscilloscope to verify zenith, azimuth, and anti-skate force using Analogue Productions Test LP. Phase between channels is right on (zenith), and distortion of amplitude sweep is the same for both channels (anti-skate). I minimized cross-talk for the worse channel (azimuth). All good.

The strange thing though, is when measuring channel outputs, the right channel was about twice the amplitude of the left channel as measured on the oscilloscope. However, I can hear NO difference between channels through the speakers. Balance and centering of the sound stage appears perfect.

The components involved are VPI Classic Signature turntable with VPI analogue drive system, Soundsmith Sussuro Cartridge, and Herron Audio VTPH 1-MC Plus. The oscilloscope is connected to the phono preamp via RCA cables using a BNC to RCA adapter at the oscilloscope.

Any ideas about what is going on? 
gareents

Showing 1 response by mijostyn

mijostyn's avatar
mijostyn
8,570 posts
 
Gareents, you have to look at the scale. There might not be much difference. 

oldears and Hvymec if there is a calibration error it is the same for both channels therefore it factors out. 

Cartridges can easily be off 1 dB between channels at certain frequencies. With the right scale this can look like a huge variation when in reality it is not. 
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