YoungSC said:
Remove QN05-08 and RN27/28. Remove ALL of the headphone circuitry.
A well known article ! Do not follow the advice about biasing the opamps into class A, though, it is not the best way.
Andy
6h5c said:
probably because you wanted a truckload of them 😉
Im sorting it out with my uni email address as i can't be bothered to pay the fee just for using a hotmail account.
YoungSC said:
Basically QN05...08 are the ones to remove to disable muting on the RCA output, and QN91/92 for the headphone circuit. If you do this both, you can also take out the driver transistors QN24/25 and two resistors that feed the muting lines (RN27/28). If you never use a headphone, you can disable the circuit by removing C901/902 and two wire links that provide +/- 12V to the circuit (U271/272).
By grounding the left-over traces you can lower the amount of interference radiated into the analog circuit. I used 100n ceramics because I use the muting lines to drive a muting relais, but you can use wire links directly to ground if you don't have that.
Regards,
Ray
Malefoda said:
The caps on the supply lines are for extra decoupling. It could be possible the LM4562 benefits from that too, but that's easy to test by trying them with and without the extra caps.
Ray
Thankyou Gents,
I shall get into it tonight.
The improvements so far are great. I'm a bit of a song flicker at heart, but last night I found myself captivated listening to song after song and enjoying it all.
I've put building room treatments on hold to do this work, but hopefully in combination with the mods I'll end up with a really satisfying sound.
Simon (from Oz)
I shall get into it tonight.
The improvements so far are great. I'm a bit of a song flicker at heart, but last night I found myself captivated listening to song after song and enjoying it all.
I've put building room treatments on hold to do this work, but hopefully in combination with the mods I'll end up with a really satisfying sound.
Simon (from Oz)
YoungSC said:
Glad to be of service!
That's what it's all about in the end: enjoying the music!
Ray
Hello guys
Been v busy at work upgrading cd players for customers😀
I seen the forum is as popular as ever.
Ray I also see you use muting relays, i love the click you get between tracks.
Brent
Been v busy at work upgrading cd players for customers😀
I seen the forum is as popular as ever.
Ray I also see you use muting relays, i love the click you get between tracks.
Brent
CD 53 SE mods
Dear All
I am doing some mods in my Marantz CD 53 and already removed the muting transistors.
I intend to remove the output caps but just mesaured 25 mv between them and ground.
I think that this value can be too high but I measured it with the CD playing.
Can it hurt my pre amp (Meridian 101) or is it safe to remove the caps.
Best Regards
Ricardo
Dear All
I am doing some mods in my Marantz CD 53 and already removed the muting transistors.
I intend to remove the output caps but just mesaured 25 mv between them and ground.
I think that this value can be too high but I measured it with the CD playing.
Can it hurt my pre amp (Meridian 101) or is it safe to remove the caps.
Best Regards
Ricardo
6h5c said:
Yes! It's the ultimate solution for me. No clicks and pops during power-up, and the audiophile 'click' between the tracks is very sophisticated 😀.
Ray
Is that a home-made pcb, Ray?
Andy
SimontY said:
Yep ! The extra cost is a bit of a nuisence but , hey, under $3 per chip !!!
I received mine yesterday morning. I've just got to find time to try them out!
Andy
