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The *NOT BORING!* Hi-Fi faff chat and sales B&W 603 S2
http://www.retrobike.co.uk/forum/viewtopic.php?f=17&t=80994
Page 38 of 174

Author:  tintin40 [ Sat Jun 09, 2012 9:06 am ]
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apache wrote:
http://www.scribd.com/doc/27113994/Marantz-PM350-Amp-service-manual

Looks very straightforward. Knock yourself out :)


I'd blow it up. :lol:

Author:  apache [ Mon Jun 11, 2012 9:22 pm ]
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Here you go chap. Done a bit more...

Image

1) Headphone amp + power supplies removed
2) Power feed to servo controller cleaned up with passive filters
3*) Dedicated and balanced left / right +/-15v power supplies for analogue output stages designed / built - more headroom, lower noise design than original 12v supply
4) DAC clock layout rejigged to reduce trace inductance and probably reduce clock jitter and noise. XTAL case bonded to ground and glued to board with hot glue
5 & 6) Passive filtering for digital DAC supply (will replace this 5v supply with it's own dedicated supply next)

* This board sits where the output buffer was before it, and all mute circuits were removed. No pops or cracks, ultra quiet.

Output is DC coupled as the supplies are matched so there is no DC offset at the O/P's of the op-amps.

Author:  tintin40 [ Mon Jun 11, 2012 9:31 pm ]
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WoW 8) Looks excellent work. Shame i don't live near you. I'd bring amp & Sony cd player.

I bet you could have fixed my Nakimich deck?

Author:  apache [ Mon Jun 11, 2012 9:46 pm ]
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Anything can be fixed - it's just a matter of cost. :lol:

What Sony have you got? A lot of more recent stuff is very integrated and all surface mount, which doesn't really offer the scope for meddling :wink:

Author:  tintin40 [ Mon Jun 11, 2012 10:00 pm ]
Post subject: 

apache wrote:
Anything can be fixed - it's just a matter of cost. :lol:

What Sony have you got? A lot of more recent stuff is very integrated and all surface mount, which doesn't really offer the scope for meddling :wink:


A Sony CDP-590
I'm busy collecting Sony Walkman. Have 3 now and just won a 4th a mint 94 anniversary in London so no postage.

Author:  RobMac [ Mon Jun 11, 2012 11:31 pm ]
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tintin40 wrote:
I'm busy collecting Sony Walkman. Have 3 now and just won a 4th a mint 94 anniversary in London so no postage.


Tintin do you know what a WM-36 is? :shock:

Author:  tintin40 [ Tue Jun 12, 2012 12:34 am ]
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RobMac wrote:
Tintin do you know what a WM-36 is? :shock:


I had one BITD :D

Love Walkman 8)

Author:  tintin40 [ Wed Jun 13, 2012 6:26 pm ]
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Just got this 14th birthday version of the Walkman. Goes well with my Black walkman :D

Author:  legrandefromage [ Wed Jun 13, 2012 6:47 pm ]
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I'll see your walkmans and raise you:

Image

Author:  tintin40 [ Wed Jun 13, 2012 7:17 pm ]
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:D very nice the DD2 8) Soon will have a couple more Walkmans to show.

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