Marantz CD63 & CD67 mods list

[Fidelity Audio]

I use the exact same HexFreds in my cdp. I found them to help the dynamics of the sound a very tiny bit over the schottky I were using.
I have been looking and you can get 4amp versions now HFA04TB60 and they are alot cheaper than the 8amp ones.

Brent

[Fidelity Audio]

I have finalised a few of the tx upgrades and sorted a few loose ends on clocks and reg locations where possible.

Simon saw it in the flesh yesterday.

SEE PICS HERE

Brent

[Fidelity Audio]

I had a very pleasent listening session at Simons last night with good ales and a nicely improved sound over the last visit a few months ago.

Very sweet vocals, plenty of natural bass and good treble timing.

Brent

[SimontY]

Originally posted by rowemeister
...a nicely improved sound over the last visit a few months ago.

Very sweet vocals, plenty of natural bass and good treble timing.

Thanks man!

The improvements are:

* use of Marantz MA-500 mono power amps
* massive toroid in preamp
* BG AC type in preamp
* C1 clock on servo in CD63
* S Power on DAC analogue in CD63
* S Powers on output stage

I'm pretty sure none of those mods were in place last time.

The sweet vocals are a product of the Marantz amps and the Black Gates in the preamp.

The treble timing was improved by the C1 on the servo, as were detail levels.

The S Powers on the output stage took that treble and made it clear and present. Forthright and accurate.

Simon

[Fidelity Audio]

err no dont thinks so, maybe the DAC analogue had the SPower on.

Excellent news on the regs. It pleases me.

Brent

[RCruz]

Originally posted by rowemeister
I have finalised a few of the tx upgrades and sorted a few loose ends on clocks and reg locations where possible.

Simon saw it in the flesh yesterday.

SEE PICS HERE

Brent

Hi Brent

Incredible pics...... really great stuff there.

Can you suggest an upgrade opamp for the audio section of my CD 53 SE ?

[Fidelity Audio]

Thanks

I like the audio from the LM4562NA, especially with black gate caps on the power rails, if you don't want black gate then Cerefine or Silmics are decent enough.

Brent

[Thomo]

Originally posted by rowemeister
Thanks

I like the audio from the LM4562NA, especially with black gate caps on the power rails, if you don't want black gate then Cerefine or Silmics are decent enough.

Brent

I agree. Also check out the Rubycon ZA, ZL etc caps. These sound excellent also.

Lee.

[RCruz]

Originally posted by rowemeister
Thanks

I like the audio from the LM4562NA, especially with black gate caps on the power rails, if you don't want black gate then Cerefine or Silmics are decent enough.

Brent

Thank You brent

I would like some gidance on this because I am not familiar with the concept.

May I just replace the opamps without any more mods ?

Are these the same size and the same pin distribution as the original ones ?

What about the power input... does it need to be modified ?

Must I do some major modifications in the original PCB layout?

Regards

[Fidelity Audio]

No modifications required the opamps are a straight swap, I would however recommend shorting out the 4 feed resistors right next to the opamps. This seemd to give more punch to the bass.

Brent