Beautiful condition, works perfectly, from my vintage audio collection.

Classic Adcom DAC with the well regarded PCM63 chips...Ive enjoyed the musicality of this unit since purchased here on eBay by a seller who is well versed in modifications of this unit (I am not) I will include a copy of our communication regarding this unit and I quote Tricked out. Every single cap in the output stage has been upgraded with the best option I could find. I did it in 2 stages. First stage was socket the opamps and replace with OPA627 and new film bypass caps. That was the biggest bang for the buck. Then I went back in and upgraded every cap sparing no expense.That brought it to a new level. I also upgraded several caps in the power supply section with Panasonic FC. Another forum member has a power supply cap upgrade suggestion I went with. Didnt notice any difference with that upgrade,but having new caps in an old unit is always good. Theres literally nothing that could be done at this point to make it any better Faceplate is really nice as is the rest of the unit with the exception of the top cover which exhibits some rust bubbles but certainly not terrible...A nice custom fabricated 5 foot 10 Gauge (A little overkill) power cable included...Buy with confidence from an eBay member since 1998!

ADCOM GDA-600 Digital to Analog ConverterAudio DACUntested + Cables What you see in the pictures is what you will receive. There is no power cord but they are readily available. The 2 braided purple cables are ~7 feet long. The Adcom will be carefully wrapped and shipped in a cardboard box. Shipping will be via USPS Ground Advantage, FedEx, or UPS and cost $17.00

This PCM 63 vintage DAC is considered a good starting point for mods and Ive included the parts needed to update the op-amps (updated op-amps not included). Includes a pair of RCA cables as well as the power cable.

This item belonged to my uncle. I know nothing about it and it is used and seems to work when plugged in.

This item belonged to my uncle. I know nothing about it and it is used and seems to work when plugged in.

This item belonged to my uncle. I know nothing about it and it is used and seems to work when plugged in.

DETAILS:GRADE A+TESTEDPowered onAS-ISWith everything in the photo SHIPPING:* We ship out the order when payment is cleared. Same day shipping for all SKUs beginning with BPC. SKU is at the bottom of the description. Payment MUST be cleared before 3PM for same-day shipping.* We offer FREE GROUND SHIPPING on all of our listings to the continental U.S. If you would like faster shipping, we have several options at checkout. If you need faster, please purchase with free shipping, and send us a label. * We also offer shipping to international destinations and also ship to APO/FPO addresses.* If you purchase multiple items, we will consolidate your orders.* A shipping notification will be emailed to you once your order has been shipped. * We do not ship on Sundays or public holidays, otherwise we ship every day during the week. If expedited shipping is paid for, we will do our best to ship on Saturdays. RETURN:* We stand behind our products. If the item does not function AS LISTED, we will offer you a free return. PLEASE CONTACT US FIRST. Thank you! :-)* We will only provide a return shipping label from the original address the item was shipped to. If any item is forwarded to a different address or out of the USA, the buyer will be held responsible to pay for the return of the item back to the address we have on file for where the item was delivered. We do not cover international returns. ALL items returned will be subject to a restocking fee equivalent to 10% of the purchase price (unless DOA). FEEDBACK:If there is any problem that makes you lower your feedback rating, please contact us directly via eBay message and we will solve any and every concern to guarantee your 100% satisfaction. All messages will be answered within 24 hours even on weekends (except public holidays). Please check your spam/junk folder in your email if you do NOT receive a response from us. SKU: #SC-641

This PCM63 based DAC is fully operational and in excellent working order. I recently modified the DAC by replacing all its electrolytic capacitors - Nichicon MUSE (FG, KZ and ES) for power supply and Elna Silmic II for the analog section. In addition, the two opamps were replaced with socketed OPA627, the 0.1uf bypass caps were replaced with Vishay 1837. Now the DAC is in a different league with better clarity, dynamics and staging. There are some minor blemishes on the chassis, but the faceplate is in perfect condition. No cables come with the unit.

COAX 1 input had a cap on it when I bought it. Have not tested this input or the optical, I only used one input and a coax switcher. OPA627 and associated caps replaced on both channels. Nice sounding PCM63 DAC!

The AdcomGDA-600 Digital to Analog Converter adds to the musicality of signals processed through it, in its own way. It has its own sound, mojo/character, yet in the best kind of way!!The AdcomGDA-600 is top-notch technology for its time, and its audio quality is certainly competitive today. This converter’s overall character is much more about the unique audio and/or ‘musical’ experience, than pure technical analysis of its numbers as a D/A converter.This unit is in excellent working order, and all functionality has been checked prior to packaging/shipping. There are some very minor blemishes on the chassis, and the faceplate (control panel) is in outstanding condition as well (see images). The power cord is included, and also a PDF owner’s manual is supplied on CD ROM. Technical Specifications: DIGITAL· Input format: S/PDIF, AES/EBU· Input type· S/PDIF Coax (RCA x 2)· S/PDIF Optical (Toslink® x 1)· AES/EBU (XLR X 1)· Input isolation: Transformer coupled· Input decoding: Crystal CS 8412receiver· Digital output: S/PDIF Coax (RCA X 1)· Digital filter: Burr-Brown Linear Phase· Resampling rate: 8x (352.8kHz for44.1 kHz input)· DAC type: Selected R-2R Burr-BrownPCM-63· Resolution: 20 bits· Phase inversion: Digital domain (manual selection) ANALOG · Frequency response: + 0, - 0.5 dB (DC - 20kHz)· THD: 0.009% (20 Hz - 20kHz, full scale) 0.002% (1 kHz, full scale)· Signal to noise ratio 106dB (20Hz - 20kHz, unweighted) >112 dB (20Hz - 20kHz, A wtg.)· Dynamic range: 98dB· Channel-to-channel crosstalk 106dB (20Hz-20kHz) 112dB (1kHz)· Output voltage: 2.234 V RMS (full scale)· Output impedance: 77 ohms· Output type: Single ended (RCA x 2)· Output mute: Relay activated (Power, Unlock) · F

Classic Adcom DAC Tested Toslink and coax inputs, both work well. I am not able to test the AES input. generally excellent condition, with a few scratches in the paint on the top of the case -- see photos. Looks can be deceiving. When it was released, this DAC was considered the best you could get under $1500. Perhaps that explains why, to this day, the ADCOM GDA-600 is known as one of the great sleeper DACs. In keeping with a successful begin with the basics approach, Adcoms engineers carefully re-thought the power supply used in this exciting new product. Isolated on its own circuit board, it incorporates a bi-directional AC filter, two transformers, seven separate stages and 27 filter capacitors to increase circuit isolation and minimize noise and unwanted interference.An industry acclaimed Crystal Semiconductor receiver, custom-configured for minimum jitter, forms the front end for conversion circuitry that includes a high speed digital filter and dual selected Burr-Brown 20 bit ladder-type DACs. Each units master clock duty cycle is individually computer-calibrated to insure the highest accuracy.Linear phase anti-imaging filters, 1% metal film resistors and Adcoms proprietary linear gain amplifiers give exceptional analog performance. Again, individual calibration assures minimal DC offset.The GDA-600s flexibility is assured by four impedance-matched inputs: three S/PDIF inputs (two coaxial, one optical) and an AES/EBU XLR input. A buffered S/PDIF output lets you record entirely in the digital domain.Compliance with stringent FCC Rule 15 standards assures minimum RF and EMI emissions and the highest levels of compatibility with other high performance components in an audio-only or an audio/video home entertainment system.The GDA-600 is truly an example of Adcoms forward-thinking engineering where low jitter design, Class A analog circuitry and Adcoms dedication to the highest quality, custom-configured electronic parts combine for a groundbreaking improvement in digital sound.

Enhance your audio experience with this high-quality ADCOM GDA-600 digital to analog converter. Designed to deliver exceptional audio performance, this DAC is compatible with Adcom and features a sleek black finish that complements any home audio setup. Whether you're a music enthusiast or a professional looking for a reliable audio converter, the ADCOM GDA-600 is the perfect choice for you.

This listing is for. used GDA-600 Digital to Analog Converter. The unit powers up but has not been tested. DAC TYPE: Selected R-2R Burr-Brown PCM-63 Sold As-Is. Included Items:ManualLine Cord -----See associated Listing:ADCOM GSA-700https://www.ebay.com/itm/196077271453 ADCOM GDD-1https://www.ebay.com/itm/196077192654

Used, has a good amount of wear and tear as seen in pictures. Works great, have been using it the last several years without any issue. Power cord included. Please message with any questions

Transform your digital audio into high-quality analog signals with the ADCOM GDA-600 Digital to Analog Converter AUDIO DAC. Designed to deliver superior sound the GDA-600 was manufactured in the United States between 1994 and 1996, and weighs 12 lbs. Unit has been tested and is fully functional. The face is very clean. There are some light scratches to the top (see photos). A power cord is included. GDA-600 The GDA-600 Digital to Analog Converter brings you closer to the reality - and to the astonishing potential - of digital sound by controlling the inherent distortions and design compromises evident in most digital sources. In keeping with a successful begin with the basics approach, Adcoms engineers carefully re-thought the power supply used in this exciting new product. Isolated on its own circuit board, it incorporates a bi-directional AC filter, two transformers, seven separate stages and 27 filter capacitors to increase circuit isolation and minimize noise and unwanted interference. An industry acclaimed Crystal Semiconductor receiver, custom-configured for minimum jitter, forms the front end for conversion circuitry that includes a high speed digital filter and dual selected Burr-Brown 20 bit ladder-type DACs. Each units master clock duty cycle is individually computer-calibrated to insure the highest accuracy. Linear phase anti-imaging filters, 1% metal film resistors and Adcoms proprietary linear gain amplifiers give exceptional analog performance. Again, individual calibration assures minimal DC offset. The GDA-600s flexibility is assured by four impedance-matched inputs: three S/PDIF inputs (two coaxial, one optical) and an AES/EBU XLR input. A buffered S/PDIF output lets you record entirely in the digital domain. Compliance with stringent FCC Rule 15 standards assures minimum RF and EMI emissions and the highest levels of compatibility with other high performance components in an audio-only or an audio/video home entertainment system. The GDA-600 is truly an example of Adcoms forward-thinking engineering where low jitter design, Class A analog circuitry and Adcoms dedication to the highest quality, custom-configured electronic parts combine for a groundbreaking improvement in digital sound. Adcom GDA-600 Technical Specifications DIGITAL Input format.....S/PDIF, AES/EBU Input type S/PDIF Coax (RCA x 2) S/PDIF Optical (Toslink® x 1) AES/EBU (XLR X 1) Input isolation.....Transformer coupled Input decoding.....Crystal CS 8412 receiver Digital output.....S/PDIF Coax (RCA X 1) Digital filter.....Burr-Brown Linear Phase Resampling rate 8x (352.8kHz for 44.1 kHz input) DAC type.....Selected R-2R Burr-Brown PCM-63 Resolution.....20 bits Phase inversion.....Digital domain (manual selection) ANALOG Frequency response.....+ 0, - 0.5 dB (DC - 20kHz) THD 0.009% (20 Hz - 20kHz, full scale) 0.002% (1 kHz, full scale) Signal to noise ratio 106dB (20Hz - 20kHz, unweighted) >112 dB (20Hz - 20kHz, A wtg.) Dynamic range.....98dB Channel-to-channel crosstalk 106dB (20Hz-20kHz) 112dB (1kHz) Output voltage.....2.234 V RMS (full scale) Output impedance.....77 ohms Output type.....Single ended (RCA x 2) Output mute.....Relay activated (Power, Unlock) GENERAL Power requirements 97 - 132 VAC, 50/60 Hz 220-240VAC,50/60Hz Power consumption (nominal).....15watts at 120VAC Fuse.....3/8 amp, Slow blow Dimensions 17(432mm) x 3 1/2(89mm) x 10 1/2(267mm) Shipping weight.....12 lb.

Used with some wear and scratches, see pictures. Tested, working. Comes with an AC power cord.

VTG ADCOM GDA-600 Digital to Analog Converter, Unit was found to power on, no additional testing performed. No power cord included