Hi all 😉
Simon, what mods did you do on the servo board? I searched for a substitute for the drive opamp too, but no succes, it can drive a huge current for an opamp. Only thing i did was decoupling with bigger and better caps (to reduce low freq rumbles on PS) with beads.
I am also fond on the S1 or maybe S2 dac. It gives hearable lower distorsion: better background and low level information, more blackness in the music (silences are more silent) Dynamics are better controlled and not "peaking" and less "distorting" with high level dynamic music parts. This with my cd880 his original S1.
But, unfortunately i hear on about -90dB a very faintly low level distorsion on it, on the left channel.
Have to figure that out.....
Simon, what mods did you do on the servo board? I searched for a substitute for the drive opamp too, but no succes, it can drive a huge current for an opamp. Only thing i did was decoupling with bigger and better caps (to reduce low freq rumbles on PS) with beads.
I am also fond on the S1 or maybe S2 dac. It gives hearable lower distorsion: better background and low level information, more blackness in the music (silences are more silent) Dynamics are better controlled and not "peaking" and less "distorting" with high level dynamic music parts. This with my cd880 his original S1.
But, unfortunately i hear on about -90dB a very faintly low level distorsion on it, on the left channel.
Have to figure that out.....
Hiya, I just put bigger, better caps on the board - replaced all the electrolytics. I might do more later...!
Simon
Simon
tubee said:But, unfortunately I hear on about -90dB a very faintly low level distorsion on it, on the left channel.
You can hear -90 dB ?
jean-paul said:
Volume cranked up, with ear on speaker. And sort intermodulation with some sort of low level treble music. I fear 1 transistor of output stage from dac is
Hi Guys,
Been really busy at work so only just got time to catch up on the thread!
I've also put what little time I had spare into the CDP. I've got a Burson from Brent that I'm now using as an I/V stage. I have a single 1k8 feedback resistor and no filter on the I/V at all.
All I can say I wow! Those Bursons are absolutely fantastic. The sound is Subsonic! So much more presance. Its well worth looking at modding the I/V.
I've also got a devide by 2 circuit to fit onto the DAC that I've not had time to fit yet so I'l let you know how that goes. I know Lee already fitted his and is well impressed.
I'll keep you updated!
BTW, I can't measure it but I'm pretty certain I can't hear -90db!🙄
Ian
Been really busy at work so only just got time to catch up on the thread!
I've also put what little time I had spare into the CDP. I've got a Burson from Brent that I'm now using as an I/V stage. I have a single 1k8 feedback resistor and no filter on the I/V at all.
All I can say I wow! Those Bursons are absolutely fantastic. The sound is Subsonic! So much more presance. Its well worth looking at modding the I/V.
I've also got a devide by 2 circuit to fit onto the DAC that I've not had time to fit yet so I'l let you know how that goes. I know Lee already fitted his and is well impressed.
I'll keep you updated!
BTW, I can't measure it but I'm pretty certain I can't hear -90db!🙄
Ian
I've also been distracted with an irritating Linux server. Hohum.
Interesting comments about the Burson! Nice one.
Let us know how you get on with the /2 🙂
I might indulge in that sort of thing again. Another opportunity to make it look shoddy 😉
Interesting comments about the Burson! Nice one.
Let us know how you get on with the /2 🙂
I might indulge in that sort of thing again. Another opportunity to make it look shoddy 😉
jean-paul said:
Of course you cannot hear -90dB but you will hear much cleaner low level retrieval, better HF, deeper sound stage etc..
Cheers,
I'm pretty sure we all knew what you were getting at!!!🙄
Anyone interested in discrete I/V but not wanting to spend the £ on Burson may want to check out the CD63/67 mods thread.
Although I've not heard them, they look pretty well made and they are definately cheaper!
or
"If u want to know more about OPA SUN V2."
http://www.audio-gd.com/enweb/pro/diy/OPA.htm
Might be worth a look??
Still not had time to fit that D2 circuit to pin 2! Hopefully I'll get a chance tomorrow 😀
I'll keep you posted
Ian
Anyone interested in discrete I/V but not wanting to spend the £ on Burson may want to check out the CD63/67 mods thread.
Although I've not heard them, they look pretty well made and they are definately cheaper!
or
"If u want to know more about OPA SUN V2."
http://www.audio-gd.com/enweb/pro/diy/OPA.htm
Might be worth a look??
Still not had time to fit that D2 circuit to pin 2! Hopefully I'll get a chance tomorrow 😀
I'll keep you posted
Ian
Fitting that divide cct on my dac made a huge difference to the sound.
Massively improved clarity, detail, spaciality and dynamics. I don't really know what it's done in technical terms, as this pin was tied to the 5v supply originally.
Cheers, Lee.
Massively improved clarity, detail, spaciality and dynamics. I don't really know what it's done in technical terms, as this pin was tied to the 5v supply originally.
Cheers, Lee.
I've def seen that pin described as clock in on one of the other threads (poss ultimate NOS) so I'm guessing its clock in unless its state (high) causes the clock to come from somewhere else???
Would like to inderstand why its /2 though? If its clock in could it not be fed direct??
I would also like to understand what this pin is doing!
Anyone................
Would like to inderstand why its /2 though? If its clock in could it not be fed direct??
I would also like to understand what this pin is doing!
Anyone................
I think you're referring to the bit clock. This isn't the same as Master Clock.
I2S clocks out 16 bits per sample from the SAA7220. So, if you multiply the bit length by the sample rate by the number of overamples and then double it for stereo this gives you ...16 x 44100 x 4 x2 Hz , or about 5.6Mhz - which is exactly half the master clock.
So if you divide the master clock by 2, you magically get the correct frequency for the bit clock - that hasn't been munged by the SAA7220, and had so much jitter added.
I2S clocks out 16 bits per sample from the SAA7220. So, if you multiply the bit length by the sample rate by the number of overamples and then double it for stereo this gives you ...16 x 44100 x 4 x2 Hz , or about 5.6Mhz - which is exactly half the master clock.
So if you divide the master clock by 2, you magically get the correct frequency for the bit clock - that hasn't been munged by the SAA7220, and had so much jitter added.
philpoole said:
That makes sense - TY philpoole
rowemeister said:
Another example might be
"my ex wife munged my plans to become a millionaire by shagging the neighbours husband, kicking me out and legally robbing me of everything I owned during a bitter divorce"
DEF one for you profanisaurus Brent!!
😀