Can the Shanling SCD-T200 be modded to accept a digital input?

mattjk · 14th March 2005, 06:42 AM

I would like to use it as my main preamp, and use a dvd player as well.

ThorstenL · 14th March 2005, 09:30 AM

Konnichiwa,

Quote:

Originally posted by mattjk
I would like to use it as my main preamp, and use a dvd player as well.

In princile it could be done. It would not be easy or straightforward though. Also, quite frankly the internal "preamp" in the T200 is junk, for want of a better word. On the old version (the Gold & Stainless steel chassis) you change the jumper to the Tube Output PCb to bypass the Volume Control & Preamp circuit, the improvement in sound quality is quite dramatic.

Sayonara

Skov_dk · 27th December 2008, 11:45 PM

Hi, This subject is getting interesting once more as the interest of dac's increases with all the new digital storage systems and services now available. I'm very pleased with my scd t-200, and wish to mod it with a digital input option if possible to avoid another big and expensive piece in my system. Any guidelines, references og contact info? that would be awesome, if you could be so kind.

I'll probably eliminate the "preamp" circuit and complete other upgrades while I'm at it.
Thanks a million in advance and best regards.
Soren.

rfbrw · 28th December 2008, 02:26 AM

It would help to know more about the innards of the SCD-T200.

Skov_dk · 13th January 2009, 03:27 PM

Hi!
The innards are:
4 x 6N3 tubes, 2 for the tube output and 2 for the
headphone output.
Sony KHM-2334AAA drive.
Sony CXD2752R SACD decoding chip,
Burr Brown PCM 1738 24 bit/192kHz DAC with the following datasheet:
http://focus.ti.com/lit/ds/symlink/pcm1738.pdf

Does this bring up any ideas?

Thanks in advance and best regards.
Soren.

rfbrw · 14th January 2009, 02:42 AM

It is possible but not easy.The software controlled nature of the PCM1738 complicates matters. The switch between DSD and PCM is software controlled and you would need to intercept that process in order to activate the '1738 which presumably mutes when no disc is present or playing. You would also have to add a second two way switch to select between the SPDIF input and the output of the DSD/PCM selector.

Skov_dk · 15th January 2009, 02:54 PM

Luckily I'm a pro software guy, eventhough it might not help in this case.
But are there any guidelines somewhere? just general with modding this sort of chips that way eventually. Or any reference to persons who might know how to do this?

The switching part is farely easy I guess compared to cracking the part with DSD and PCM. But any guidelines are very welcome as well.
Thanks in advance and best regards.
Soren.

rfbrw · 17th January 2009, 07:40 AM

The how bit is easy. It is implementing the how bit that is tricky. It is best done with a board designed for the task at hand.

Skov_dk · 17th January 2009, 05:11 PM

Aha. So if I just can find the right board then some wire cutting, solding and wiring could do the job with adding an option for a digital input ?
And it should be in connection with a switch between the SPDIF input and the output of the DSD/PCM selector.

Now how to find the right board if possible?

rfbrw · 22nd January 2009, 03:18 AM

There is no board that quite does what you need. They are either too big, require a lot of add ons or major modification and any combination of boards would probably take up too much space.
Some other things to consider;
a. How to switch between inputs? Does one add a switch to the front panel or perhaps set up the unit to automatically default to the external input in the presence of audio data? Is this new input under remote control and if it is to be, how?
b. How does one indicate the selected input ?
c. What is an acceptable level of cosmetic alteration?

14th March 2005, 06:42 AM	#1
mattjk diyAudio Member Join Date: Aug 2004 Location: Huntington Beach, Ca	Can the Shanling SCD-T200 be modded to accept a digital input? I would like to use it as my main preamp, and use a dvd player as well.

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27th December 2008, 11:45 PM	#3
Skov_dk diyAudio Member Join Date: Dec 2008	Hi, This subject is getting interesting once more as the interest of dac's increases with all the new digital storage systems and services now available. I'm very pleased with my scd t-200, and wish to mod it with a digital input option if possible to avoid another big and expensive piece in my system. Any guidelines, references og contact info? that would be awesome, if you could be so kind. I'll probably eliminate the "preamp" circuit and complete other upgrades while I'm at it. Thanks a million in advance and best regards. Soren.

28th December 2008, 02:26 AM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	It would help to know more about the innards of the SCD-T200.

13th January 2009, 03:27 PM	#5
Skov_dk diyAudio Member Join Date: Dec 2008	Hi! The innards are: 4 x 6N3 tubes, 2 for the tube output and 2 for the headphone output. Sony KHM-2334AAA drive. Sony CXD2752R SACD decoding chip, Burr Brown PCM 1738 24 bit/192kHz DAC with the following datasheet: http://focus.ti.com/lit/ds/symlink/pcm1738.pdf Does this bring up any ideas? Thanks in advance and best regards. Soren.

14th January 2009, 02:42 AM	#6
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	It is possible but not easy.The software controlled nature of the PCM1738 complicates matters. The switch between DSD and PCM is software controlled and you would need to intercept that process in order to activate the '1738 which presumably mutes when no disc is present or playing. You would also have to add a second two way switch to select between the SPDIF input and the output of the DSD/PCM selector.

15th January 2009, 02:54 PM	#7
Skov_dk diyAudio Member Join Date: Dec 2008	Luckily I'm a pro software guy, eventhough it might not help in this case. But are there any guidelines somewhere? just general with modding this sort of chips that way eventually. Or any reference to persons who might know how to do this? The switching part is farely easy I guess compared to cracking the part with DSD and PCM. But any guidelines are very welcome as well. Thanks in advance and best regards. Soren.

17th January 2009, 07:40 AM	#8
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	The how bit is easy. It is implementing the how bit that is tricky. It is best done with a board designed for the task at hand.

17th January 2009, 05:11 PM	#9
Skov_dk diyAudio Member Join Date: Dec 2008	Aha. So if I just can find the right board then some wire cutting, solding and wiring could do the job with adding an option for a digital input ? And it should be in connection with a switch between the SPDIF input and the output of the DSD/PCM selector. Now how to find the right board if possible?

22nd January 2009, 03:18 AM	#10
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	There is no board that quite does what you need. They are either too big, require a lot of add ons or major modification and any combination of boards would probably take up too much space. Some other things to consider; a. How to switch between inputs? Does one add a switch to the front panel or perhaps set up the unit to automatically default to the external input in the presence of audio data? Is this new input under remote control and if it is to be, how? b. How does one indicate the selected input ? c. What is an acceptable level of cosmetic alteration?

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