Marantz CD63 & CD67 mods list

[SimontY]

Originally posted by poynton
Simon, got the sick bag ready????

I paid £15 for 10 inc. postage! HeHe

Andy

Classic Ebay bargain!

My fave so far that I got was 128 7" bass drivers for about £70.

Altho my 2kva isolation tx was a good buy too, think that was £35, or maybe less.

[poynton]

Originally posted by SimontY




My fave so far that I got was 128 7" bass drivers for about £70.

Ok - I have to ask - what on earth do you do with 128 7" bass drivers???

( apart from reselling them singly on Ebay for £5 each )

[SimontY]

Originally posted by poynton
Ok - I have to ask - what on earth do you do with 128 7" bass drivers???

Augmenting the bass range of my speakers (inc. bi-amping) and particularly
http://www.diyaudio.com/forums/showt...232#post831232

I'm having a go at making my speakers into 3-way by rolling off the current mid/bass section and introducing some extra cabs loaded with these babies. 8 per speaker isobaric push-pull is what I am knocking up right now, and it could be ok, certainly should take a LOT of power.

Also, we modified 6 (removed cones, added steel bar across frame, blocks of wood etc.) to use as floorshakers in my friends bassment. We also used 4 in his 'bar' area to bring up the midrange and upper bass in there, just mounted in-wall.

So that's 10 down and possibly 16 to use in the current project...

(apart from reselling them singly on Ebay for £5 each)

Yes, I have considered this and will probably try a few and see if anyone takes them. They're decent enough units and I can sell them with a suggested cabinet or even plans, so I think it's a nice product for a fiver. And good markup!

[Fidelity Audio]

Ray quote

Do not, by any means, run the clock off the +12V!!!!

The Audiocom clock runs off of a +9V to +18V supply.

I gave the option to run it from the standard 12V cct short term.

I have my clock running from a 12V audiocom reg supplied from the now barely used +20V rail.

[Franz G]

My latest modifications: second tranny with rf filter, fast rectifier and some caps for the audio voltages.

Absolutely great players, this marantz series.

Franz

[6h5c]

Hi Franz,

Nice job, it's starting to look like a KI already .

What's the PCB floating above the HDAM cans? Some PSU filtering?

Regards,

Ray.

[Franz G]

What's the PCB floating above the HDAM cans? Some PSU filtering?

No, this is a simple LC low pass filter (ca. 50kHz/12dB).

All the modifications are according to Gerald Gessner. The audio part consists just 50% of an OPA2134 followed by the LPF.

Franz

[poynton]

Originally posted by Franz G


No, this is a simple LC low pass filter (ca. 50kHz/12dB).

All the modifications are according to Gerald Gessner. The audio part consists just 50% of an OPA2134 followed by the LPF.

Franz

Hi.

How close does the tray come to the Tx / board??

Do you have a link for this mod??

Andy

[poynton]

Originally posted by 6h5c

.................It is an exact copy of Thorsten's circuit.................

Hi.

Did you keep any of the original filter after the DAC or did you change everything as per Thorsten's circuit????

Andy

[6h5c]

Originally posted by poynton
Hi.
Did you keep any of the original filter after the DAC or did you change everything as per Thorsten's circuit????

Andy

Hi Andy,

I took out the resistors directly at the outputs of the DAC and connected it to Thorstens filter instead. The circuit sounds very good, but I have some HF noise present in my tweeters. I'm now figuring out if it is radiation from my nearby clock PCB, or because the circuit uses only one output and thus it is not cancelled out in some way.

Originally posted by Franz G
No, this is a simple LC low pass filter (ca. 50kHz/12dB).
All the modifications are according to Gerald Gessner. The audio part consists just 50% of an OPA2134 followed by the LPF.

Franz

Franz,

Do you have a schematic of the passive circuit you use?
Is there any noise residue with this passive circuit?

Regards,

Ray.