6h5c said:
Ray there is some little difference, I listened to it all last night with LEDs on. (switch being fitted today with cyan led's).
I will report with findings after weekend. I want to make sure I am right and not just believing it is better. If its worse I will say.
Everything sounded good last night though!!!!
I will get the wife to switch it on and off (without me knowing which position it is in) for the tests.
rowemeister said:
Hi.
If you are replacing the ribbon, IMO the 2 crucial cables are the +5v supply and the HF signal. If you look at the routing, the +5v is at the end of a run with the uP also taking power - noisy!! Remember, most of the RF board is analog so this +5v should be from a clean source. Similarly, the routing of the HF signal leaves a lot to be desired and is a prime candidate for coax direct to R501. I suggested this earlier in the thread.
Andy
I do like ray's earth point😀
been looking at the pcb layout to see if i can take the digital earth somewhere else
idea is use star earth on brass bar (main earth)
everthing earths to the bar.
allan
been looking at the pcb layout to see if i can take the digital earth somewhere else
idea is use star earth on brass bar (main earth)
everthing earths to the bar.
allan
I am not worried about the 5V rails as I am going to build a reg pcb for servo digital 5v , analogue 5v , HF & RF 5v.
I'll source some small coax for RF to HF also.
A star point earth sounds very good indeed.
I'll source some small coax for RF to HF also.
A star point earth sounds very good indeed.
ray just added the pcb layout (component layout)
explains why he put his main earth near U221 analoge rca's
it was in one of his pictures
allan
explains why he put his main earth near U221 analoge rca's
it was in one of his pictures
allan
rowemeister said:
Hi Brent,
Cool, i'm curious about the results.
awpagan said:
Thanks Allan, i'm flattered
!poynton said:
Hi Andy,
I scanned the PCB-layout of the CD57/67 PCB. If you want it I can send you a new CD57_67_doc.pdf, just give me a PM.
Ray.
awpagan said:I think you gentlemen have past this long ago
allan
The mods on that site are good. I like the idea of using coax for the digital signals, but I don't want my player to look like that! Maybe if I run into very thin coax some day, I will do that mod.
Ray.
awpagan said:
Hm, I wish it were that simple....
You would want to keep the top trace, cause that runs to the +/-12V groundpoint 😀.
All the local groundpoints are also connected through the top-layer groundplane. Not bad, but they should have designed a real double-sided PCB. That would have saved a lot of wire bridges. Maybe in the future i'm going to solder some litz wire across the board.
A virgin plain PCB, ready to be mounted 😀
(with Thorsten's circuit, that is)
Attachments
I also have a Marantz CD63 special edition CD player and I am wondering what mods will deliver the best change.
Are you able to tell measured differences or are all the differences you are hearing by ear only?
Are you able to tell measured differences or are all the differences you are hearing by ear only?
burnedfingers said:
Well, my mods have added 67% to sound quality, but my sound quality meter needs calibrating.
Hmmmm top ground plain, dam forgot about that😱
o'well
looks like i'am going to have to take the pcb out again
this time just looking at ground planes. 😀
new pcb?
how about i2s out to separate dac etc
but this destroy's all the fun😀
allan
o'well
looks like i'am going to have to take the pcb out again
this time just looking at ground planes. 😀
new pcb?
how about i2s out to separate dac etc
but this destroy's all the fun😀
allan
LOL @ Simon 😀
Surley all mods to audio are for the ear only?
But yes most mods discussed on this thread have given significant gains in all areas of audio
Surley all mods to audio are for the ear only?
But yes most mods discussed on this thread have given significant gains in all areas of audio
Quote:
Well, my mods have added 67% to sound quality, but my sound quality meter needs calibrating.
What were those mods if I may ask?
Well, my point is..I have seen fist fights develop over the sound of capacitors and if you blindfolded the same people they couldn't tell what the better sounding cap was.
I don't put a lot of blind faith into what people think they hear in the way of changes. Has anyone run any distortion tests to see if there was an improvement?
Well, my mods have added 67% to sound quality, but my sound quality meter needs calibrating.
What were those mods if I may ask?
Well, my point is..I have seen fist fights develop over the sound of capacitors and if you blindfolded the same people they couldn't tell what the better sounding cap was.
I don't put a lot of blind faith into what people think they hear in the way of changes. Has anyone run any distortion tests to see if there was an improvement?