GUIDANCE NEEDED to mod - MARANTZ SA 7001 - Page 4 - diyAudio
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Old 3rd August 2012, 05:35 PM   #31
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Quote:
Originally Posted by Thomo View Post
Does anybody mind if I resurrect this thread?

I've done much more extensive work on my SA7001 now and it is by far the best player I've ever owned.

Will post an updated mods list and pics if anyone's still interested.

Lee.
Lee,
Yes, please post. Maybe there's something you've done that I haven't perhaps.
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Old 6th August 2012, 06:22 PM   #32
Thomo is offline Thomo  United Kingdom
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Ok then, here goes:
Click the image to open in full size.

That's the general overview of the main player. The regs and caps at the dac are going to be tidied up pretty soon, and I'll be swapping the 4 x Black Gate smoothing caps on the dac for some 22,000uF Mundorfs. (The BG's are going into my preamp when I get around to it).

Lee.

edit: sorry about the image quality, camera packed up so resorting to the iPhone.
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Old 6th August 2012, 06:30 PM   #33
Thomo is offline Thomo  United Kingdom
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And the mods list:

http://redhillaudio.co.uk/images/lees_system/Thomo's_SA7001KI_Mods_List.pdf

Ta,

Lee.
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Old 8th August 2012, 02:16 PM   #34
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I have 2 other mods... The biggest improvement in sound quality was when I bypassed the differential hdam. I'm using only one phase of the CS4397, coupled to the current LPF by a mkp capacitor and a bleeder resistor. The result is a natural warm sound. I was inspired to do this bij de Hawk Audio MP-Dac.

TNT-Audio MP-Dac:
"While the CS4390 features balanced-differential voltage outputs, the MP-DAC uses only one phase of the signal: this may compromise dynamics and internal common mode noise rejection, but allegedly the designers have tried all possible configurations of this chip, eventually settling for the solution with the best sonics. "

The second mod was inspired by my Marantz PM-17. The HDAM of the PM-17 is similar to the SA7001 hdam, but the PM-17 has a potmeter across 2 resistors. I added a potmeters to the hdams in my SA7001 and now the dc-offset is adjustable. I used to have 80mv on the output after bypassing the output capacitors. Now it is adjusted to 0mv +/- 1mv.
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Old 8th August 2012, 06:35 PM   #35
Thomo is offline Thomo  United Kingdom
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Hi Dennusch. A couple of years ago when I was last using this player I bypassed a lot of the output stage and found it beneficial.

However, I'm now using pretty revealing ATC speakers, a much better DIY preamp and more transparent power amp. I now find that because the whole system sounds so linear, with no real peaks or dips in the frequency response I need that full output stage in for the best sound. Without it, the sound becomes slightly bright, a tiny bit harsh and the ultimate deep bass isn't as good.

The trimpot is a great idea and is something I've been thinking about myself.

Lee.
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Old 9th August 2012, 05:37 AM   #36
6h5c is offline 6h5c  Netherlands
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Hi Lee,

Impressive list, thanks for sharing! Reminds me that I still have to dig into my 8400 a bit deeper...

That may come rather sooner than later, because I noticed the laser is starting to skip now and then on SACD. I like the idea of a second clock :-)

Regards,

Ray
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Old 9th August 2012, 09:53 AM   #37
Thomo is offline Thomo  United Kingdom
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Thanks Ray, nice to hear from you.

I suggest that you take a really close look at that servo board under the mech. Those standard SMT caps hold back the sound massively. If you get those swapped out for Oscon SEPC's you will certainly get big improvements.

I still have plenty of things left to do, and some more ideas to try too.

Cheers, Lee.
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Old 9th August 2012, 11:05 AM   #38
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Quote:
Originally Posted by Thomo View Post
The trimpot is a great idea and is something I've been thinking about myself.
I used 5k trimpots, cheap and effective. I used the PM17 service manual to find the right way to integrate de trimpots onto the hdams.

In your mod list you mention 2 different clocks, CD 16.9 mhz and SACD 33.86 mhz. I have only replaced the SACD 33.86 for a low jitter clock. But i also heard an improvement for cd playback. Is that possible?
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Old 9th August 2012, 12:13 PM   #39
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Originally Posted by Thomo View Post
Thanks Lee.
Where do you install the second clock, the 16.9mhz. one?

Steve
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Old 10th August 2012, 09:56 PM   #40
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by Thomo View Post
Thanks Ray, nice to hear from you.

I suggest that you take a really close look at that servo board under the mech. Those standard SMT caps hold back the sound massively. If you get those swapped out for Oscon SEPC's you will certainly get big improvements.

I still have plenty of things left to do, and some more ideas to try too.

Cheers, Lee.
Thanks Lee, i'll look into that.

I see that Farnell has a wide range of Sanyo SVP in stock, are they any good? They are SMD's, and I like things to look nice and neat so i'd rather not use though-hole types on that board (I know, it's neurotic ;-)

Ray
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