Retrobike Forum Index

It is currently Thu Dec 08, 2016 12:53 pm

* Login   * Register * Search  * FAQ

Forum rules


**Classified Rules & Guidance - Feedback - Dispute Procedure - Gold Trader Status - All Adverts Need A Price - 5 Adverts Maximum - Leave Prices In Sold Adverts**



Post new topic Reply to topic  [ 1706 posts ]  Go to page Previous  1 ... 35, 36, 37, 38, 39, 40, 41 ... 171  Next
Author Message
 Post subject:
PostPosted: Sat Jun 09, 2012 9:06 am 
King of the DuckBoard
King of the DuckBoard

Joined: Sun Jan 28, 2007 12:30 pm
Posts: 21466
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:


Top
 Profile  
 
 Post subject:
PostPosted: Mon Jun 11, 2012 9:22 pm 
Retro Guru
User avatar

Joined: Thu Oct 13, 2011 9:30 am
Posts: 958
Location: Malvern
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.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Jun 11, 2012 9:31 pm 
King of the DuckBoard
King of the DuckBoard

Joined: Sun Jan 28, 2007 12:30 pm
Posts: 21466
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?


Top
 Profile  
 
 Post subject:
PostPosted: Mon Jun 11, 2012 9:46 pm 
Retro Guru
User avatar

Joined: Thu Oct 13, 2011 9:30 am
Posts: 958
Location: Malvern
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:


Top
 Profile  
 
 Post subject:
PostPosted: Mon Jun 11, 2012 10:00 pm 
King of the DuckBoard
King of the DuckBoard

Joined: Sun Jan 28, 2007 12:30 pm
Posts: 21466
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.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Jun 11, 2012 11:31 pm 
Classified Mod
Classified Mod

Joined: Wed Dec 30, 2009 8:34 pm
Posts: 12697
Location: Fife in Scotland
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:


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jun 12, 2012 12:34 am 
King of the DuckBoard
King of the DuckBoard

Joined: Sun Jan 28, 2007 12:30 pm
Posts: 21466
RobMac wrote:
Tintin do you know what a WM-36 is? :shock:


I had one BITD :D

Love Walkman 8)


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 13, 2012 6:26 pm 
King of the DuckBoard
King of the DuckBoard

Joined: Sun Jan 28, 2007 12:30 pm
Posts: 21466
Just got this 14th birthday version of the Walkman. Goes well with my Black walkman :D


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 13, 2012 6:47 pm 
King of the Skip Monkeys
King of the Skip Monkeys
User avatar

Joined: Wed Nov 07, 2007 4:34 pm
Posts: 26174
Location: Moomin Valley
I'll see your walkmans and raise you:

Image


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 13, 2012 7:17 pm 
King of the DuckBoard
King of the DuckBoard

Joined: Sun Jan 28, 2007 12:30 pm
Posts: 21466
:D very nice the DD2 8) Soon will have a couple more Walkmans to show.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1706 posts ]  Go to page Previous  1 ... 35, 36, 37, 38, 39, 40, 41 ... 171  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: adlyhobart and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group