Bias test fail

rman · 13th April 2012, 02:26 AM

Hi

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?

Cheers.
Rolf.

h_a · 16th April 2012, 07:08 AM

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.

Hannes

rman · 19th April 2012, 03:56 AM

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.

Cheers.
Rolf.

13th April 2012, 02:26 AM	#1
rman diyAudio Member Join Date: Oct 2007	Bias test fail Hi 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? Cheers. Rolf.

16th April 2012, 07:08 AM	#2
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	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. Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2 transistor kits

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19th April 2012, 03:56 AM	#3
rman diyAudio Member Join Date: Oct 2007	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. Cheers. Rolf.