Marantz CD-50 and CD-60, TDA1541, CDM4/19

[Mayday]

Just looking for a smooth surface.
Will clean and re-grease again.

 

[Kim Schultz]

Any updates on the 7220 seperate ps and the reclock ?

Btw, greetings from Denmark

Regards
Kim

 

[Mayday]

Any updates on the 7220 seperate ps and the reclock ?

Btw, greetings from Denmark

Regards
Kim

Hi there neighbor

Btw, my stepfather is from Denmark.

I've ordered a 27R 3W resistor today to give the TPR a final test with a 175mA load.

I'm waiting for replacement elcos for the ones I soldered in the wrong way while running a fever...poff.

Then I'll start by replacing them, fitting the TPR w transformer.

Regards,
Jonas

 

[Mayday]

Recieved replacement caps today

Don't know if I'll have time to work on the CD-60 today though.

 

[Mayday]

Got 4 of these today, two goes in the CD-50 and the other two in a CD-75dx.
6,8uF/250V

 

[Mayday]

Replaced the exploded caps. Rubycon ZL and ZLH.
Put Sanyo OScon SEPC for all digital IC's

 

[UV101]

How's things sounding? I'm busy moving house which is why I've been a bit quiet.....

 

[Mayday]

Sounding good, but still haven't gotten around to the regs or clock.

I hope moving isn't too much work and that the new house is good

 

[Mayday]

CD-75DX

Hmm, where could I find a replacement rubber ring for the disc-holder attached to the motor?

Examples of what I'm talking about, but just the "o-ring"

Philips CDM 2/10 lasereinheit | eBay

Philips CDM 2/10 lasereinheit | eBay

 

[coolnose]

eBay: 6 Stk. Antriebsriemen für CD Player usw. 35 mm x 1,5 mm


Dunno if they send to Sweden though, but why shouldn't they..

I will order from them this week if they are willing to ship to France.

Cheers,

Max

 

[Mayday]

eBay: 6 Stk. Antriebsriemen für CD Player usw. 35 mm x 1,5 mm


Dunno if they send to Sweden though, but why shouldn't they..

I will order from them this week if they are willing to ship to France.

Cheers,

Max

Thanks mate, but arent thoose drivebelts?

But maybe they fit in place of the rubber ring that is between the metal "wheel" and the disc?

 

[Mayday]

NOS converted the CD-75DX

Replaced diode damaged by leaky cap.

Replaced leaky cap with 3x2200uF in parallell, these will of course be secured in place.

 

[coolnose]

Thanks mate, but arent thoose drivebelts?

But maybe they fit in place of the rubber ring that is between the metal "wheel" and the disc?

Those are the drivebelts for cdm 2 indeed, my mistake.

No clue where to find the rubber seal.. industrial supply ? make one yourself out of a sheet of rubber ?

 

[Mayday]

Maybe I could take an o-ring and cut to size. remove the old worn out rubber and glue the new in place with CA-glue?

 

[coolnose]

I quick shot on google gave me this..

Flachdichtungen, Gummidichtungen und Formteile aus Silikon

A local supplier of industrial goods should be able to help you out, maybe even ebay, I didn' check any further..

 

[Mayday]

I think I might be able to get a rubber ring/sealing with the right dimensions (more or less) from the local carparts shop.

 

[Mayday]

More CD-75DX.

Made a small, nothing fancy, well heatsinked reg for SAA7220

Got Vin from Vin pin on the original 7805

Grounded the reg as close to SAA7220 I could

Removed the resistor to Vdd on SAA7220, connected the reg through out leg in the hole left (a few mm from 7220 Vdd pin) and soldered it there.

Result, not tested yet as there's much more to be done

 

[Kim Schultz]

Did the same on TDA1549 based player.

I also added a dedicated 7805 for the dac in a Philips CD740.
It really makes a difference

Together with all the cap upgrades in the player, and signal taken directly from the dac via 3,3uF Obbligato's, it makes for an extremely nice sounding machine.

I haven't started working on the CD40 yet, other than replacing the tray drive wheel.

I also got another player to work on, a Teac with 2 x TDA1541A, it already sound pretty good standard, but it cannot touch the modified TDA1549.

Sorry for the OT ramble, just wanted to chime in with my impression after the dedicated DAC power mod.

Regards
Kim

 

[Mayday]

I also added a dedicated 7805 for the dac in a Philips CD740.
It really makes a difference

Together with all the cap upgrades in the player, and signal taken directly from the dac via 3,3uF Obbligato's, it makes for an extremely nice sounding machine.

I haven't started working on the CD40 yet, other than replacing the tray drive wheel.

I also got another player to work on, a Teac with 2 x TDA1541A, it already sound pretty good standard, but it cannot touch the modified TDA1549.

Sorry for the OT ramble, just wanted to chime in with my impression after the dedicated DAC power mod.

Regards
Kim

Hi Kim!
Nice to what others have done
I'm guessing the DAC in your philips is a V-out dac and not a I-out dac like the 1541A?

In my dac build I'll run it with opamps first to get an idea of that sound. Then I'll use a tube output with a single ECC86(dual triode).

Back to the CD-75dx.
I'll swap caps for ELNA RJH and sanyo OScon SEPC. Some Rubycon ZL too.
Will give the TDA1541A separate regs as well(+5,-5 and -15) and the SAA7210.

It doesn't seem to have bipolar output caps like the cd-50 and cd-60, but rather old elna silmic's. I could replace them with 6,8uF MKP's anyways?

 

[Kim Schultz]

Hi May-day.

Yep the TDA1549 is a v out dac, and I also tried it briefly with a 6N16 cathode follower, but the soundstage was much smaller and not as accurate.
It also lowered the output too much.

The sound might have more to do with the fact that there was two cheap film caps in the signal path, instead of just one now.

Tomorrow I might try it with a SRPP 6N16 stage with two Obbligato caps instead.
It should give higher output and better sound with the better caps.
And I already have the tube stages build.

I also used lots of Oscon's and they work well and are cheap too.

Regards
Kim