Marantz CD63 & CD67 mods list

[6h5c]

Yep. It's very, very faint. If shorting the zener is not enough you can replace the 7918 by a 7915 and experiment a bit with other zeners.

Ray.

[Fidelity Audio]

The reg and zener root is defo the easiest way to do it.

I'll also look into the processor side of things.

I always have mine at the lowest setting.

[6h5c]

Originally posted by rowemeister
I always have mine at the lowest setting.

Well, then I guess a 7906 will be more than enough

Ray.

[Fidelity Audio]

LOL yeah it should be.

[poynton]

Originally posted by 6h5c
Hi,

The display is turned off instantly at power-off by means of Q852...854, otherwise you would see it fade to dark. The -20V Vftd is switched to the heater voltage by Q852. You can insert a small switch there, or drive one of the transistors. It won't get rid of the controllers drive signals though.

I shorted D852 to make the display less bright (I have a fairly new player, you can read a book near the display...). Before that I always used to dim it one step. It also prolongs the life of the display.

Regards,

Ray.

So VF1 and VF2 are heater supply
and VFTD is the -24v supply for the display.
I would break the track close to the uP QF01/pin64 and fit a spst push switch in the redundant headphone socket.

Now to update the to-do list!

Andy

ps did the attachments read OK?

[Fidelity Audio]

Hi Andy

The attachments are very useful cheers

[6h5c]

Hi Andy,

Thanks for the article. Everything received o.k.
Guess I could have saved the money for that common-mode choke....

So VF1 and VF2 are heater supply and VFTD is the -24v supply for the display.
I would break the track close to the uP QF01/pin64 and fit a spst push switch in the redundant headphone socket.

Do you think that will work? I thought the outputs of the uP are switching to ground, because the cathode voltage Vftd is already supplied through the heaters. It's like a direct heated tube

Ray.

[poynton]

Hi.

In my case, the jury is still out - I think/ know better improvement can be made in other areas first.

Like snake oil, green cd ink, stabiliser rings, hard feet, soft feet or even the 'demagnetising cd' I mentioned above, some will find benefit (real or imagined) and some will not.

The problem with some/most of the improvements are that they are hard to do an A/B comparison and secondly, the improvement/degradation may be very small and subtle. I am getting older now and I know my hearing is going at the top end!

Andy

[Fidelity Audio]

2 years ago at a Kenwood seminar I and one or two thers could hear this constant high pitched noise, it was barely noticable but there.

After about an hour one of the Kenwood guys said 'Can anyone hear a high pitched noise'. To which a few said yes.

He unvailed a signal generator wired to one of their amps and speakers. 20Khz. And I could hear it. Just!!!

Most people started to hear it when it dropped below 18Khz.

One bloke (about 62 years old) who we knew was a little bit deaf on the top frequancies could only hear up to 9.5Khz LOL

[6h5c]

That's a real bummer for DIY'ers like us...
I'm trying to preserve my hearing as long as possible. Always use earplugs at concerts and drilling and things like that.

Ray.