Philips CD304Mk2 dig. out sibilance

PetrL · 7th February 2008, 08:34 AM

Hi,

recently I bought Philips CD304 Mk2 as transport for my nos DAC. Before I used different Philipses with CDM2 or 4 and was quite satisfied. But the 304's low level detail is unbelievable, probably thanks to the CDM1 transport. The first time the soundstage is as good as from record player!

However there is sibilance mainly on leading Ss in vocals, some instruments may also sound more aggressive. Unfortunately I can't tolerate this kind of distortion. I tried to fiddle (in both directions) on load of pin 14 SAA7220 by changing the first resistor of voltage divider to which the digital trafo is connected. Then I connected the whole divider+trafo via capacitor. But no succes.

Now I don't know what to do next. Replace crapy wire, including 2 connectors, from PCB to RCA connector? Change SAA7220 from another player? Buy another CDM1 player and keep this one as spare? Any ideas?

Petr

poynton · 7th February 2008, 10:04 AM

Why is the problem in the player ?

PetrL · 7th February 2008, 10:17 AM

Poyton, I was thinking this direction as well. Maybe my system is on the edge of sibilance, but this was never problem before, with another Philipses (dig. out based on SAA7220 too), nor with record player. So... no way for CD304?

PetrL · 8th February 2008, 01:24 PM

Well, yesterday I checked the supply voltage of SAA7220 and found only 4.36V, with all drop from 5.01V on the 4R7 resistor just before decoupling capacitors, so the Philips must have intended so (?). This also gives lower consumption than the datasheet's 180 mA. Anyway, in other player I measured 4.8V and decided to short the 4R7. The difference is not night and day, but I think the sibilance decreased to more or less acceptable.

Later I'm going to replace the resistor by a choke, maybe change to SAA7220P/B, and build new dig. output per Katapum schematics here.

Onnosr · 1st April 2008, 12:20 AM

1 Did you replaced the clock ?

2 shunt the spdif output with a (carbon) resistor of 75 ohm
if you use 75 ohm coax or with 50 ohm if you use 50 ohm coax
Do the same on the spdif input from your dac.

3 let us know the result.

Regards

Onno

7th February 2008, 08:34 AM	#1
PetrL diyAudio Member Join Date: Sep 2005	Philips CD304Mk2 dig. out sibilance Hi, recently I bought Philips CD304 Mk2 as transport for my nos DAC. Before I used different Philipses with CDM2 or 4 and was quite satisfied. But the 304's low level detail is unbelievable, probably thanks to the CDM1 transport. The first time the soundstage is as good as from record player! However there is sibilance mainly on leading Ss in vocals, some instruments may also sound more aggressive. Unfortunately I can't tolerate this kind of distortion. I tried to fiddle (in both directions) on load of pin 14 SAA7220 by changing the first resistor of voltage divider to which the digital trafo is connected. Then I connected the whole divider+trafo via capacitor. But no succes. Now I don't know what to do next. Replace crapy wire, including 2 connectors, from PCB to RCA connector? Change SAA7220 from another player? Buy another CDM1 player and keep this one as spare? Any ideas? Petr

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7th February 2008, 10:04 AM	#2
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Why is the problem in the player ?

7th February 2008, 10:17 AM	#3
PetrL diyAudio Member Join Date: Sep 2005	Poyton, I was thinking this direction as well. Maybe my system is on the edge of sibilance, but this was never problem before, with another Philipses (dig. out based on SAA7220 too), nor with record player. So... no way for CD304?

8th February 2008, 01:24 PM	#4
PetrL diyAudio Member Join Date: Sep 2005	Well, yesterday I checked the supply voltage of SAA7220 and found only 4.36V, with all drop from 5.01V on the 4R7 resistor just before decoupling capacitors, so the Philips must have intended so (?). This also gives lower consumption than the datasheet's 180 mA. Anyway, in other player I measured 4.8V and decided to short the 4R7. The difference is not night and day, but I think the sibilance decreased to more or less acceptable. Later I'm going to replace the resistor by a choke, maybe change to SAA7220P/B, and build new dig. output per Katapum schematics here.

1st April 2008, 12:20 AM	#5
Onnosr diyAudio Member Join Date: Aug 2006	1 Did you replaced the clock ? 2 shunt the spdif output with a (carbon) resistor of 75 ohm if you use 75 ohm coax or with 50 ohm if you use 50 ohm coax Do the same on the spdif input from your dac. 3 let us know the result. Regards Onno

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