Marantz CD63 & CD67 mods list - Page 1747 - diyAudio
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Old 19th September 2011, 03:24 PM   #17461
UV101 is offline UV101  England
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I'll definitely try with both and report my observations. My player is pretty advance now with 24 decent regs ( like SPower) including 6 on the dos (when I build and fit it!!!).

Just need to speak to Lee about some 2sk170's and I'll have everything I need!!! Can borrow some off my old dos to start with ;-)
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Old 19th September 2011, 05:28 PM   #17462
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Looks great, Ant. I copied your dual stripboard layout to build mine - I found that really helpful - cheers.

Ricardo, yes I did increase those cap values a few months ago. Perpetual motion only started after fitting the decoder regs, but it's possible something else happened in the process.
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Old 19th September 2011, 09:41 PM   #17463
UV101 is offline UV101  England
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Is there any reason for using BD560C on the CFP pair?

Could I use BC640 for example? How would this effect things?

Thanks :-)
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Old 19th September 2011, 10:51 PM   #17464
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hiya brent, simon.
looking@ a valve ouput stage any thoughts just rebuilt a pair of radfords sta25 i had.
valve verus dos do like the lm4562s tho .
cheers guys alan
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Old 19th September 2011, 11:01 PM   #17465
SimontY is offline SimontY  United Kingdom
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I don't think I've ever heard valves in a CD player! If you have no fear of the dangers, go ahead I say, maybe some of the emotion the cd63 sometimes lacks will come back.... or not.
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Old 19th September 2011, 11:05 PM   #17466
nad is offline nad  United Kingdom
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Quote:
Originally Posted by Ben Hanke View Post
Looks great, Ant. I copied your dual stripboard layout to build mine - I found that really helpful - cheers.
Thanks - no problem, glad to be of use (cheers Martin).
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Old 19th September 2011, 11:07 PM   #17467
UV101 is offline UV101  England
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I put a musical fidelity X10D clone on the back of my TDA1541 and it was crap!

With valves, it very much depends on the design. unless you are using top flight implimentation, it wont work.

My Audio Aero has a valve output stage and although its very very good, I'm still not 100% convinced.

Go DOS in the 63 with decent components if you want something special. Rays boards are pretty cheap. Thats the route I'm taking :-)
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Old 20th September 2011, 07:47 AM   #17468
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Personally I do not like the sound of valves at line level. Some areas they are very good but lack in others. They sound nice in amps as long as the quality is there. Icon audio stuff always sounds well especially diving some old quad electrostatics.

Dos is the best option for me.

Brent
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Old 20th September 2011, 09:24 AM   #17469
6h5c is offline 6h5c  Netherlands
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Hi, i'm back

Good to see there's plenty DOS-talk around

Seems the current sink needs some experimenting? Theoretically, it should be an improvement over a resistor. Maybe i'll implement a transistor-LED version in the next batch of boards, just like the one in the input stage. This would be even more versatile, and more easy to tweak to the correct current.

I'm glad you sorted out the sound now, Brent and others. Is it possible you guys could test the board with such a current sink? It's fairly simple to do: replace the FET T7 by a BC550C, replace the 100R resistor (R13) by a LED and insert a 10k resistor from the LED's anode to the +12V. R14 sets the current, it should be around 100R for 10mA to flow through the output buffer.

If you want to do it really quick-and-dirty you could even use the LED's voltage from the input stage and tie T7 base to T5 base .

Ray
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Old 20th September 2011, 09:31 AM   #17470
UV101 is offline UV101  England
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This is the X10D clone in the CD960. I upgraded all the elco's to larger value panasonic FC and replaced the film caps with Mundorf Supreme (after this picture was taken). The main output caps were mounted on the back of the player and were rather large 4.7uF supremes! The valves were cryo treated but I cant remember which ones! The I/V was burson with simple mica/RC55Y feedback filter. That was it from the DAC out. I tried with and without the valve stage and binned it off in the end. I stayed with just the Burson I/V & filter for everything I did with the various TDA1541 output stages since.

Click the image to open in full size.

The Aero uses minature 6021w valves and the design is much better but still falls somewhat short of what most valve enthusiasts would call "good". Mine is not the factory SE but I've got the 0.22uF supremes alone with replacement std valves and several opamp changes to the output circuit. I've also just ordered a couple of relays so I can remotely switch the whole valve stage in and out.

Click the image to open in full size.
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Last edited by UV101; 20th September 2011 at 09:37 AM.
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