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Old 3rd April 2013, 02:01 AM   #1
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Smile Upgrade CD Player

I have an Adcom CD player. GCD 750. Approximately 12 years old.
Took it into shop for failure of drawer to open.
According to the manual, it has 20 Bit processing, dual Burr Brown.

Is it wise to get it repaired and keep it?
Modify it?
What modifications could be done to improve it?
Or consider a more modern 24 bit player?
Thanks in advance.
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Old 3rd April 2013, 12:33 PM   #2
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I have owned an Adcom GDA-700 DAC for some number of years. I do not know whether the GCD-750 player contains essentially the same DAC circuits, but if it does, I can tell you that The GDA-700 contains an excellent digital sub-system. It features an UltraAnalog digital input reciever, the famous Pacific Microsonics PMD-100 (HDCD decoding) digital filter, and a pair of Burr-Brown PCM1702 20-bit R-2R DAC chips (which are brothers to the 24-bit PCM1704). I feel that the potential sound quality of the digital sub-system is let down some by a rather pedestrian power supply and analog sub-system design. The power supply is comprised of LM317 type 3-terminal regulators while the I/V and analog outputs both are monolithic op-amp based. Perhaps, no sins here, but no particular virtues either.

I would characterize the base sound as being decent typical CD playback, but nothing to get excited about. I made one modification that did improve the sound some. I swapped the stock (NJMs, as I recall) op-amps in the I/V converter stage with AD829 devices which I happened to have on hand. While the sound did improve, it still sounded like, well, CD. While a bit of op-amp 'rolling' did make a positive difference, I do not consider the scale of modification from which the unit truly would benefit to be practical. My GDA 700 now gathers dust. The sound is decidedly inferior to that produced by my home brew DAC projects. So, depending on your finances, I suspect that you would be better off obtaining some different model player. Be certain to sufficiently audition any prospective player before buying.
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Last edited by Ken Newton; 3rd April 2013 at 12:48 PM.
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Old 3rd April 2013, 12:53 PM   #3
dacen is offline dacen  Norway
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Here is a very useful list:
You will find that the GCD-750 contains 4 PCM1702
Attached Files
File Type: pdf cd-player-dac-transport-list.pdf (277.9 KB, 76 views)
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Old 4th April 2013, 01:33 AM   #4
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Smile thanks

Thanks for all the info.
From your description, it sounds like my Adcom GCD 750 was pretty good for it's time. My guess is that even if I do alot of upgrading and modifications it will still be an obsolete, by today's standards, cd player.

What would you recomend as a realy good player without modifications?

Also, is it better to go with a separate transport and DA convertor?


Again, thank you for your help.
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Old 4th April 2013, 01:51 AM   #5
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What is your budget?
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Old 4th April 2013, 02:51 AM   #6
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Smile adcom cd player

If the increase of quality is the same or slightly better I would spend $600.
If the increase in the quality of sound could be dramaticly improved I would spend in the neighborhood of $1000 to say $1200.
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Old 4th April 2013, 03:14 AM   #7
Mike B1 is offline Mike B1  United States
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I am using a Jolida JD100. Has a tube output stage (12AX7) and sounds good when you put some long plates in it.
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Old 4th April 2013, 02:42 PM   #8
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Quote:
Originally Posted by speedygg1 View Post
If the increase of quality is the same or slightly better I would spend $600.
If the increase in the quality of sound could be dramaticly improved I would spend in the neighborhood of $1000 to say $1200.
Your decision is complicated by the fact that you apparently don't have the option of using your GCD-750 as a transport, unless you spend part of your budget to have it repaired. Otherwise, you would need to either buy another disc player, or both another player (for use as a transport) and a DAC. There are certainly more DAC choices available than there are disc player choices. However, I won't attempt to recommed any specific models as that would be a very personal assessment based on your system, room, and ears.

Here is the link to a site with a list of DACs, catagorized by their price. I suggest identifying those models falling within your budget that are available in your area and seeking them out for audition. An integrated disc player is more convienent, and should be more cost effective, and I suggest similarly seeking ot those models within your budget for an audition. Yes, this will be a bit of a hassle, but it's the only way I know to minimize audiophile equipment selection regret.

http://www.alldacinfo.com/?page_id=242
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Last edited by Ken Newton; 4th April 2013 at 02:59 PM.
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Old 5th April 2013, 04:34 PM   #9
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Smile Thanks

Thanks Ken for all of your input. I appreciate it.
Yes, I do have a budget that I hope to use to upgrade my entire system.

If the Adcom GCD 750 comes out of the shop soon, then I'm considering using it as just a cd transport and having it feed a D/A converter. This would allow me to step up from 20 Bits to 24 Bits.

If the cost is too high to repair, then I have been looking at the "Emotiva" ERC-2 CD player which sells for about $400.
I'd welcome your opinion!

My pre amp is also an Adcom which I use only in the passive mode. It does make a difference with it's amplification stage switched out.

My active crossover is a pair of Marchand XM-6's connected in parallel ,which permits me to use them as a 3 way xover for my tri amped loudspeakers. I can vary the xover points which I see on the LEDs and I can set the gain to all 3 amps.

The eventual goal is to somehow have a 4 way active or digital crossover to add a fourth amp with 15" sub woofers.

Again, I thank you for your very helpful opinions and feel free to comment more !
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Old 6th April 2013, 02:55 PM   #10
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Quote:
Originally Posted by speedygg1 View Post
Thanks Ken for all of your input. I appreciate it.
Yes, I do have a budget that I hope to use to upgrade my entire system...If the cost is too high to repair, then I have been looking at the "Emotiva" ERC-2 CD player which sells for about $400...I'd welcome your opinion!...Again, I thank you for your very helpful opinions and feel free to comment more !
Hi, speedy,

I avoid giving specific equipment recommendations for the following two reasons. I've not heard anywhere near the majority of equipment options, and even if I had, I do not possess another persons's system, room, or ears. Having said that, It does sound to me like you are on the right track.

Another option for a new disc transport you might consider is the Tascam CD200 at about $300 or less, which features a Teac drive optimized for audio playback. With either the Tascam or the Emotiva you would have at least $600 out of a $1k budget left to spend on a DAC. I suggest checking out the Simaudio Moon 100D DAC in that price range. However, as I siad, the options are plentiful for DACs, perhaps, too plentiful. Also, at a $1k budget, you may want to audition the one box Marantz SA8004 disc player, especially, if you foresee acquiring any SACDs.

Please understand, I'm not recommending that you purchase any of these choices, indeed, I've not auditioned them myself. I'm merely suggesting that they are likely worth your effort to seek out for audition based upon their pedigree and industry reputation, and at your budget. What I do recommend is that you long audition any component before committing to keep it. A purchase is fine, so long as you have the option to return it for a full refund after a sufficiently long in-home audition period. Doing otherwise can lead to costly heartbeak in my experience, even with generally well regarded name components.

Product: CD-200 | TASCAM
http://www.uhfmag.com/Tech/Moon-100D.pdf
sa8004
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Last edited by Ken Newton; 6th April 2013 at 03:04 PM.
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