Output mute mod...Amazing! - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 17th September 2004, 03:41 PM   #1
diyAudio Member
bobhayes's Avatar
Join Date: Sep 2004
Location: Bungawalbyn, NSW
Default Output mute mod...Amazing!

I pulled the output mute transistors out of my ancient Technics SL PJ27A cd player yesterday and I can't believe the improvement in focus and treble clarity. What a difference... sounds like a new machine. Cymbals and female voices shine where they used to be quite dull and all the instraments overtones are so much clearer.
I'm sure the transistors must have ageing problems otherwise surely the manufacturer wouldn't have put them in? Next I'm going to change the output coupling caps to Sanyo Polyphenylene electrolytics (www.cpc.co.uk) and see what happens then.
Could anyone suggest any other mods I could make without spending a fortune on the old dog?
I'm hooked now!
  Reply With Quote
Old 17th September 2004, 03:54 PM   #2
diyAudio Member
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
I modified my cheap Sony 51-disc changer a bit..
I added Sanyo OS-Con bypass caps (free samples they sent me) in the power supply,along with some small film bypass caps,and replaced the LM4558 op-amps with TL082's (I think?) and noticed a bit more "control" over the sound.The bass was a little bit more controlled,and the treble was a bit more clear..A pretty subtle difference,but not bad for a $3 trip to RadioShack. I had planned to remove the muting transistors and replace them with a relay,but never got around to it.
The power supply,output stage,and clock seem to be the most modded areas of CD-players...Maybe you could add a tube output stage,inplace of the op-amps in there.
  Reply With Quote
Old 17th September 2004, 04:04 PM   #3
diyAudio Member
bobhayes's Avatar
Join Date: Sep 2004
Location: Bungawalbyn, NSW
Thanks Digitaljunkie,
Was the 4558 you replaced driving the outputs?
The output op amp in mine is an LM833 and it looks pretty good on paper, although slightly inferior to the NE5532. Would it be worth bothering changing this.
Also there is a 4558 in there but I don't know what it does as I've only traced the circuit back to the output op amp and I have no schematic.
I looked it up on the net and guitar effects use it a lot and was described by some as 'legendary".
What was the mod I saw with a .47uF polyprop over the mains input?
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
this seems amazing... tomtt Instruments and Amps 0 15th November 2006 11:56 PM
The T-Amp really IS amazing! dgo Class D 17 17th August 2005 10:05 AM
Removing output mute transistors on a CD player filholder Digital Source 6 1st April 2005 02:44 PM
Some amazing diy! SY Everything Else 1 11th February 2005 06:03 AM
please help - no mute but did mute mod - tda1541 loomis Digital Source 1 14th November 2002 10:54 AM

New To Site? Need Help?

All times are GMT. The time now is 11:03 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2