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Bias test fail
Bias test fail
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Old 13th April 2012, 02:26 AM   #1
rman is offline rman  Canada
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Default Bias test fail


With the Hi-Fi News test record, I can get through the bias tests at 12 and 14 decibels, but can't get rid of a buzz in the right channel at 16 decibels.
The turntable is a Sony PS-LX4. Cartridge is ADC QLM 36 mark 3 with new stylus. Is this a reasonable result from this level of equipment? Could the cartridge be be worn out? It sounds ok to me but I have never listened to an expensive, turntable. Would a low end Rega Turntable pass this test?

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Old 16th April 2012, 07:08 AM   #2
h_a is offline h_a  Europe
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Hi Rolf,

if the buzzing occurs only for one channel it appears that antiskating is not set optimally.

Well, if the stylus is new than this is what it is able to track; the turntable is not going to change much as this is mostly a cartridge property.

Before judging sound quality, be sure to use proper load capacitance (the one recommeded for your cartridge by its manufacturer) in your phono amp.

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Old 19th April 2012, 03:56 AM   #3
rman is offline rman  Canada
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Hi h_a.

Thanks for the reply. I guess the antiskate just is not strong enough for some reason. The only load capacitor I have now is the miller capacitance of the 6922 input tube and the turntables output leads.

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