upgrade marantz CD94mkII

ronrhe · 17th January 2009, 03:31 PM

Does any of you have experience with upgrading a marantz cd94mkII?

It's an old cd player with 2 TDA1541A Single crown's in deferential mode and 4x upsampling, but with a lot of NE5534 behind the dac's.

I have the folowing options:

- make it a NOS dac by deleting the upsampling.

- make the dac's parallel. So 2 TDA1541 single crown parallel.

- straight from the DAC to a single FET like the http://www.lampizator.eu/LAMPIZATOR/...ishizator.html and direct to the output.
I like this solution because it's very simple.
Or must i use some different kind of I/V conversion?

I think a discrete output will be better than opamps.

Reading DiyAudio is lots of different possibilities, but wich is best for me?

Regards
Ronald

Gabdx1 · 20th January 2009, 07:58 PM

You could try to get that HDAM analog output driver for DAC, TDA1541 thing on ebay... it cost around 100 $ with shipping....

All it need is a 0-36vac or 0-18-018 vac transfor , proly 15 VA is enough.

poynton · 20th January 2009, 09:59 PM

To Start, I would improve the power supplies - extra regulators and maybe more transformers.

A new clock

Change output muting to relay if not already on this model

But whatever you do, remember the golden rule of modding......

Go slowly ! One mod at a time.......

Andy

Extreme_Boky · 21st January 2009, 12:12 AM

You obviously haven't tried the search engine....

94 mk II before / after

Boky

Gabdx1 · 21st January 2009, 12:52 AM

all the suggestions are interesting and could make a huge difference in the sound

Still , HDAM analog output driver for DAC is worth installing, it looks like brand new and was designed by marantz/phillips

It will replace the output stage... its like changing the amplifier.

ronrhe · 29th January 2009, 01:24 PM

Boky,

i did search and found your topic about the 94mkII.
But.. there is nothing about a discrete analogue output. You use opamps, i will not.
There is nothing about making the DAC parallel and NOS.

I also found http://www.diyaudio.com/forums/showt...09#post1719109
wich does parallel dac's and NOS and use analogue output. But in some different situations.

I believe the changes to NOS, parallel and analogue output wil have more input on the sound than the changes you made. (at least i hope it will...)

Ronald

Gabdx1 · 29th January 2009, 06:12 PM

Ronrhe,

You have many choices :

HDAM - designed by philips and used by marantz in their top players = they do it in china - replication 90 $ us
= you just buy the module and plug it to the TDA output : it amplifies and buffer the signal and filter high frequency.

Build your own output/filter stage

Build the one of monica2 ( cant remember the name)

Build a tube output

Use any preamp with modification / aikido / etc

17th January 2009, 03:31 PM	#1
ronrhe diyAudio Member Join Date: Jan 2009	upgrade marantz CD94mkII Does any of you have experience with upgrading a marantz cd94mkII? It's an old cd player with 2 TDA1541A Single crown's in deferential mode and 4x upsampling, but with a lot of NE5534 behind the dac's. I have the folowing options: - make it a NOS dac by deleting the upsampling. - make the dac's parallel. So 2 TDA1541 single crown parallel. - straight from the DAC to a single FET like the http://www.lampizator.eu/LAMPIZATOR/...ishizator.html and direct to the output. I like this solution because it's very simple. Or must i use some different kind of I/V conversion? I think a discrete output will be better than opamps. Reading DiyAudio is lots of different possibilities, but wich is best for me? Regards Ronald

20th January 2009, 09:59 PM	#3
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	To Start, I would improve the power supplies - extra regulators and maybe more transformers. A new clock Change output muting to relay if not already on this model But whatever you do, remember the golden rule of modding...... Go slowly ! One mod at a time....... Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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20th January 2009, 07:58 PM	#2
Gabdx1 diyAudio Member Join Date: Jan 2009	You could try to get that HDAM analog output driver for DAC, TDA1541 thing on ebay... it cost around 100 $ with shipping.... All it need is a 0-36vac or 0-18-018 vac transfor , proly 15 VA is enough.

21st January 2009, 12:12 AM	#4
Extreme_Boky diyAudio Member Join Date: Dec 2003 Location: Sydney	You obviously haven't tried the search engine.... 94 mk II before / after Boky

21st January 2009, 12:52 AM	#5
Gabdx1 diyAudio Member Join Date: Jan 2009	all the suggestions are interesting and could make a huge difference in the sound Still , HDAM analog output driver for DAC is worth installing, it looks like brand new and was designed by marantz/phillips It will replace the output stage... its like changing the amplifier.

29th January 2009, 01:24 PM	#6
ronrhe diyAudio Member Join Date: Jan 2009	Boky, i did search and found your topic about the 94mkII. But.. there is nothing about a discrete analogue output. You use opamps, i will not. There is nothing about making the DAC parallel and NOS. I also found http://www.diyaudio.com/forums/showt...09#post1719109 wich does parallel dac's and NOS and use analogue output. But in some different situations. I believe the changes to NOS, parallel and analogue output wil have more input on the sound than the changes you made. (at least i hope it will...) Ronald

29th January 2009, 06:12 PM	#7
Gabdx1 diyAudio Member Join Date: Jan 2009	Ronrhe, You have many choices : HDAM - designed by philips and used by marantz in their top players = they do it in china - replication 90 $ us = you just buy the module and plug it to the TDA output : it amplifies and buffer the signal and filter high frequency. Build your own output/filter stage Build the one of monica2 ( cant remember the name) Build a tube output Use any preamp with modification / aikido / etc

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