Modded Adcom GDA-600 D/A converter
heiney9
Posts: 25,165
Things have been really slow in the Classified's in the past year or so, but I'm going to give this a try.
This is a heavily modded Adcom GDA-600 D/A converter. I did the mods w/ the help of a few on here and a friend of mine who is steadier with an iron than I am. The mod is about 6 years old. The original thread I detailed the journey is gone since they switched to Vanilla (or atleast I can't find it).
The power supply was modded with Panasonic FC, Nichicon (Fine Gold) and Muse caps (almost all of them were replaced) about 8-10 caps in all, IIRC.
On the analog side,
a pair of dual BB - OPA627 opamps were installed. They are from Cimmaron Technologies and are mounted on an adapter that makes them easily removable. Light years ahead of the originals. Caps were mounted to the under side of the op-amps to prevent oscillation, so I have no doubt any other current dual op-amp could be swapped in each channel. Including discretes.
All the caps in the signal path were replaced with RTE and Multicap polypropylene types. About 10 caps in all.
Total material costs at the time was just shy of $150.
It was totally transformed, read all the reviews or ask anyone that owns one here on the forum. A bunch of guys followed the lead set by George Daniel and every person was wowed!!
Here is a really long link that covers the entire process w/ testimonials and reviews.
http://forum.polkaudio.com/discussion/97185/the-adcom-gda-600-modification-thread/p1
If I can find my original pics of the mod I will post them later.
Unit condition is about 7 close to an 8. Top has some light scuffing, hairline scratches, front face is clean, no fading or dings. Everything works, I miss the versatility of 2 coax, 1 optical and 1 AES/EBU. I think I have the original box.
I was keeping this in the audio closet, but I will probably never have a need for it. A great, analog sounding unit that I have owned for a very long time.... never disappointed.
$200 plus shipping
H9
P.s I have a pair of Burson discrete voltage regulators that I will throw in deal. I never put them in, they are brand spanking new!
This is a heavily modded Adcom GDA-600 D/A converter. I did the mods w/ the help of a few on here and a friend of mine who is steadier with an iron than I am. The mod is about 6 years old. The original thread I detailed the journey is gone since they switched to Vanilla (or atleast I can't find it).
The power supply was modded with Panasonic FC, Nichicon (Fine Gold) and Muse caps (almost all of them were replaced) about 8-10 caps in all, IIRC.
On the analog side,
a pair of dual BB - OPA627 opamps were installed. They are from Cimmaron Technologies and are mounted on an adapter that makes them easily removable. Light years ahead of the originals. Caps were mounted to the under side of the op-amps to prevent oscillation, so I have no doubt any other current dual op-amp could be swapped in each channel. Including discretes.
All the caps in the signal path were replaced with RTE and Multicap polypropylene types. About 10 caps in all.
Total material costs at the time was just shy of $150.
It was totally transformed, read all the reviews or ask anyone that owns one here on the forum. A bunch of guys followed the lead set by George Daniel and every person was wowed!!
Here is a really long link that covers the entire process w/ testimonials and reviews.
http://forum.polkaudio.com/discussion/97185/the-adcom-gda-600-modification-thread/p1
If I can find my original pics of the mod I will post them later.
Unit condition is about 7 close to an 8. Top has some light scuffing, hairline scratches, front face is clean, no fading or dings. Everything works, I miss the versatility of 2 coax, 1 optical and 1 AES/EBU. I think I have the original box.
I was keeping this in the audio closet, but I will probably never have a need for it. A great, analog sounding unit that I have owned for a very long time.... never disappointed.
$200 plus shipping
H9
P.s I have a pair of Burson discrete voltage regulators that I will throw in deal. I never put them in, they are brand spanking new!
"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
Post edited by heiney9 on
Comments
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Heck of a deal here kids, and you all know Brock spit shines his gear every night before turning in. If you want to explore external dacs and don't have too much scratch to throw at it, this is your ticket.HT SYSTEM-
Sony 850c 4k
Pioneer elite vhx 21
Sony 4k BRP
SVS SB-2000
Polk Sig. 20's
Polk FX500 surrounds
Cables-
Acoustic zen Satori speaker cables
Acoustic zen Matrix 2 IC's
Wireworld eclipse 7 ic's
Audio metallurgy ga-o digital cable
Kitchen
Sonos zp90
Grant Fidelity tube dac
B&k 1420
lsi 9's -
15 caps were replaced in the powers supply section.
See page 4 of the link I posted for a complete breakdown of parts and photos!!
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
Shot you a pmChrisPreamp: Anthem Pre 2L (Jan-Phillips Green) Processor: Marantz SR7012 Amp: B&K 200.5Streaming: Bluesound Node 2IDAC: Eastern Electric Minimax Plus4K Bluray: Panasonic UB820Mains: Von Schweikert VR2Center: Von Schweikert LCR15 Subs: 2 SVS Sb13 Ultra (HT Only) Analysis Plus Cables
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Somebody better get this quick,,still have mine,,Brock is essentially giving this away,, it will be gone in a New York second! Still,use mine every dayJC approves....he told me so. (F-1 nut)
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*sale pending*
It is a hard decision, but I can't think when I might use it again. I'm fully invested and very happy with the EE DAC Plus (wish it had one more coax input however). I have the wonderful Keces (usb) in the office rig. Thought long and hard about a 3rd rig for awhile, but it would just be room candy as the office rig barely gets much use these days as it is.
I did pull it out the out the other day and put it in the main rig again, not too shabby. But it's time to move it along to someone that can use it.
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
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I'm looking forward to listening to this. My Sony SACD broke and I've been using my HD DVD player, which I'll now test out as a transport.ChrisPreamp: Anthem Pre 2L (Jan-Phillips Green) Processor: Marantz SR7012 Amp: B&K 200.5Streaming: Bluesound Node 2IDAC: Eastern Electric Minimax Plus4K Bluray: Panasonic UB820Mains: Von Schweikert VR2Center: Von Schweikert LCR15 Subs: 2 SVS Sb13 Ultra (HT Only) Analysis Plus Cables
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Just in case, I'll get in line, though it sounds like a done deal.Polk Lsi9
N.E.W. A-20 class A 20W
NAD 1020 completely refurbished
Keces DA-131 mk.II
Analysis Plus Copper Oval, Douglass, Morrow SUB3, Huffman Digital
Paradigm DSP-3100 v.2 -
SOLD"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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Congrats on the quick sale guys, dagame27 got a fantastic deal on this unit!
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Yep, great deal. Would have jumped on it myself if I hadn't just bought one to mod.b]Beach Audio[/b]: Rega RP6 (mods) - AT33PTG/II - Parks Budgie SUT - PSAudio NPC * Eversolo DMP-A6 * Topping D90iii * Joule-Electra LA-100 mkIII * Pass Aleph 30 * MIT S3 * Polk SRS 2.3tl (mods) * PSAudio PPP3
Beach Study: Pro-Ject Stream Box S2 Ultra & Pre Box S2 * Pass ACA * DH Labs SS Q10 * Brines Folded ML-TQWT RS 40-1354 * PSA Dectet
Beach Master: WiiM Pro * Dayens Menuetto * Zu Libtec * Dynaudio Audience 50
Beach Den: Bluesound Powernode 2i * DH Labs SS Q10 * Zu Omen DWII * Richard Gray RGPC
Town Study: WiiM Pro * Chord Qute (Pardo) * Elekit TU-8600 * MIT S3 * Revel M22 * Beyer DT-990 * Shunyata Hydra 2
Town Den: Music Hall mm5.1se - Denon DL-103r - Jolida JD9ii (mods) * WiiM Pro * Cary xCiter * Rogue 99 Magnum * Schiit Aegir * MIT S3 * Polk SRS 1.2tl (mods) * Dectet * Bottlehead Crack - Senn 600
Town Porch: WiiM Pro Plus * Sunfire Sig II * Canare 4S11 * Magnepan 1.6 * Dectet -
Yep,, parts alone will cost you thatJC approves....he told me so. (F-1 nut)
