New opamps and caps in Marantz CD-40

Restoration and upgrade of non-working Marantz CD-40 based on the Philips TDA1541A 16-bit DAC. New opamps and electrolytic capacitors.
Music used in this video by order:
Summer Evening by Keys of Moon | / keysofmoon
White Petals by Keys of Moon | / keysofmoon
Eclipse by Keys of Moon | / keysofmoon
Music promoted by www.free-stock...
Attribution 4.0 International (CC BY 4.0)
creativecommon...

[@TechStuff365]

Good heat spreading technique when soldering the opamps.

[@audioupgrades]

Thanks for noticing.

[@pascalphase2556]

A rare footage vidéo ! thank you

[@jimsregaturntableshifijukebox]

Wishing you a very happy New Year. Jim 🏴󠁧󠁢󠁳󠁣󠁴󠁿 ☺

[@audioupgrades]

Thank you 😊 A happy new year to you too. Here's hoping that 2022 brings nothing but good sound and good tidings.

[@karlharrison2449]

Great stuff. Thanks.

[@ewhibs]

Xtra points for Barry White!

[@audioupgrades]

@@ewhibs Whehey! You recognised it.

[@toterttitentel497]

hi do you have any link for the kit or some manual of what you did, thanks in advance

[@audioupgrades]

Hi, I used the service manual from here: www.hifiengine.com/manual_library/marantz/cd-40.shtml For opamps I used MUSES 8920 because they are affordable and have a nice midrange. For power supply and digital circuits caps I used Nichicon KW, Panasonic FC / FM and Wurth ATG8. For analog circuit I used the same Nichicon ES plus KW. The stock blue film caps are good quality Philips so keep those. Good luck!

[@vincentsemper]

Hello, did u change also the smd caps ?

[@audioupgrades]

Hello. I left the smd resistors and caps in place. Generally, they have little impact on sound.This was a simple upgrade with new opamps and electrolytic refreshers to make better use of the TDA1541 dac. On more elaborate units, I'll change smd bypass caps to radial film caps.

[@srboljubsrbic7431]

What abouth does Philips axial electrolitic caps? 🤔

[@audioupgrades]

Those are axial due to a height restriction. The plastic bars of the case block those sites, preventing the use of radial caps. It was important to change the other caps in the drive circuit because they were broken and preventing the disc from spinning and reading. The axial caps took a bit longer to source so I changed them later.

[@srboljubsrbic7431]

@@audioupgrades i disagrie. does are bad very often,u can use radial and just lye them on bord.

[@audioupgrades]

@@srboljubsrbic7431 The player worked perfectly and sounded great without changing the axials. I don't like mashing things up, so I replaced them with axials later. They weren't in stock so they took a few weeks extra.

[@srboljubsrbic7431]

@@audioupgrades ok,but does regulate curent of laser so they are important...i can send u the picture how i have done it on my ...

[@audioupgrades]

@@srboljubsrbic7431 I have changed them for new axials already. If you use radials you have to leave the legs too long and shield them with silicone tubing. I prefer honouring the original design, when possible.

[@raoulduke1914]

pretty hard to see what you are doing and no list of parts replaced

[@audioupgrades]

Fair comment. I replaced all the radial electrolytic capacitors. They had dried out and caused the CD driver circuits to malfunction. It's a fairly common fault in really old CD players.

[@raoulduke1914]

@@audioupgrades Tx, and what opamps did you put in? Also what did you think of the results? any noticeable improvement?

[@audioupgrades]

@@raoulduke1914 Opamps = Muses 8920. It wasn't running when I got it. After the fix it sounded very good straight away. Muses 8920 are affordable and always sound good.

[@raoulduke1914]

@@audioupgrades tx good info for those looking here. I have some BB opa604 I might try after recapping. I guess you wouldnt want to spend too much on such a budget player.

[@audioupgrades]

@@raoulduke1914 Exactly, that's why I use Muses 8920 on low-end equipment. Mind you, with the 16 bit TDA1541 dac, it still has potential.