Marantz CD63 & CD67 mods list

[Fidelity Audio]

Why thank you Simon

I think these should be called Dogs bollocks. hehe

Yep I will bypass them with 10uF blackgates and 0.1uF polypropylene.

I now have 4 top mods pending... can't wait. Hopefully early next week all the bits will be here

[Fidelity Audio]

OK they were cheap anyway lol

Would you not recommend something better than the OPA132, it is very cheap to buy and dont mind spending more.

I will be using OPA627 for ic1

[Fidelity Audio]

My brain hurts lol

[ozone_stink]

Originally posted by SimontY


Thank you very much for sharing this fantastic list of modifications.

I too have a CD63ki and I have used an Audiocom clock with a dedicated external supply, I installed new op-amps (OPA627bp), and have changed or removed dozens of other components (eg. removed muting transistors and dc blocking caps). The sound is very good.

I have yet to play with the regulators, but this is something I'll look at soon. Also, I have not touched the HDAM, yet.

From your PDF:
"the HDAM-circuit looks nice, but when moving up to better opamps and interconnects this circuit starts to
interfere and degrades sound quality. To disable HDAM: remove R651...654 (+/- 12V), R617/618 and
RH23/24. Insert wire jumper at R619/620."

I have good op-amps and interconnects etc., so it is time to try this mod. Without having the service manual in front of me, I cannot picture how your changes bypass the HDAM - does the wire jumper from R619/20 bypass the whole circuit, if so where does it connect, at the phono sockets?

I second Brent's question about how it affects sound quality.

Thanks and regards

I have the .pdf of the service manual for the CD43_53_63 on hand if anybody wants it.

BTW, everybody raves about the OPA627s even thought the AD8610s look better on paper. Has anybody compared the two back to back? -I'm using the AD8620 (dual 8610) from Brown Dog in my Rotel RCD 02 and I'm quite happy with them.

mattgwood(at)yahoo(d0t)ca

[6h5c]

Originally posted by rowemeister
OK they were cheap anyway lol

Would you not recommend something better than the OPA132, it is very cheap to buy and dont mind spending more.

I will be using OPA627 for ic1

Originally posted by rowemeister
My brain hurts lol

I can imagine why. My brain would also hurt if I had spent so much $$$ on that Audiocom stuff. You could have had a decent new player by now.

Why is the OPA132 not good enough, is it because it's not expensive enough?? Have you ever considered listening to it first?

Ray.

[Fidelity Audio]

I have the sevice manual but wouldnt mind it in pdf format

[SimontY]

Originally posted by 6h5c
I can imagine why. My brain would also hurt if I had spent so much $$$ on that Audiocom stuff. You could have had a decent new player by now.

Why is the OPA132 not good enough, is it because it's not expensive enough?? Have you ever considered listening to it first?

The Audiocom stuff might be great - have you tried it?

He is using 2134, so yes, it has been done.

I have used 2132 for a while and assessed it over many months. Then I moved to 627bp, and it is another league entirely. If you cannot hear this clearly you may need to upgrade speakers, amps, cabling, room, supports, mains etc.

edit: I misread OPA132 as OPA2132, so I'll go back to sleep now :-/

For sure, several combinations should be tried, unless they're insanely expensive.

[6h5c]

Originally posted by ozone_stink


BTW, everybody raves about the OPA627s even thought the AD8610s look better on paper. Has anybody compared the two back to back? -I'm using the AD8620 (dual 8610) from Brown Dog in my Rotel RCD 02 and I'm quite happy with them.

Hi Matt,

I agree. I think it's because the OPA627 has an 'audiophile' status of some kind. I compared it with AD8610, OPA124, OPA227.... see list.
And the winner was not the OPA627. It sounds not as clear and detailed as others.

Regards,

Ray.

[Fidelity Audio]

6h5c..

I was only enquiring if there was better for more money incase you thought I did'nt want to spend much

The super regs you see on my picture were only £16 each off ebay and they were the perfect size to fit between the big caps.

My brain hurts knowing which op amps to settle on. I know all of them are going to be good, and the Browndog pcb with 627 on will be better than my opa2134.

Anyway I have bought some opa132. You seem to like them so ill give it a go

Thanks

[6h5c]

Originally posted by rowemeister
6h5c..

I was only enquiring if there was better for more money incase you thought I did'nt want to spend much

The super regs you see on my picture were only £16 each off ebay and they were the perfect size to fit between the big caps.

My brain hurts knowing which op amps to settle on. I know all of them are going to be good, and the Browndog pcb with 627 on will be better than my opa2134.

Anyway I have bought some opa132. You seem to like them so ill give it a go

Thanks

Hi rowemeister,

No offense meant. Should have posted an extra
But i'm a bit sceptic towards Audiocom stuff.

Regards,

Ray.