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

ADCOM GDA 700 DIGITAL-TO-ANALOG CONVERTER AUDIO DAC + HDCD IN GOOD WORKING CONDITION ** PLEASE SEE ALL THE PICTURE FOR MORE DETAIL, WHAT YOU SEE AND WHAT YOU WILL GET** IF YOU HAVE ANY QUESTION, PLEASE ASK BEFORE YOU BUY! THANKS FOR LOOKING! OUR POLICY WE MUST RECEIVE PAYMENT WITHIN 2 DAYS AFTER AUCTION ENDED.TEXAS BUYER WILL PAY 8.25% SALES TAX. WE USUALLY SHIP WITHIN 1-2 BUSINESS DAYS AFTER WE RECEIVED A CLEAR PAYMENT. WE ONLY SHIP TO PAYPAL CONFIRM ADDRESS. WE DON’T SHIP TO P.O/APO/AFO BOX. WE SHIP WORLDWIDE. EXTRA SHIPPING FEE WILL APPLY FOR ALASKA, HAWAII AND PUERTO RICO. PLEASE ASK BEFORE YOU BIDS OR BUY AN ITEM. IF YOU RECEIVED AN ITEM “NOT AS DESCRIBED”. PLEASE CONTACT US A.S.A.P AFTER YOU RECEIVED AN ITEM. SO, WE CAN RESOLVE THE PROBLEM. DEAR BUYER PLEASE CONTACT US BEFORE YOU SEND AN ITEM BACK OR LEAVE THE NEGATIVE FEEDBACK IF THE ITEM NOT AS DESCRIBED

Working Condition: ExcellentCosmetic Condition: ExcellentOwners: 1Tobacco Exposure: NoService History: NoneMSRP: $2400Included: Manual, OEM Power Cable, Factory packagingShipping: FedEx Ground (CONUS only)I bought this new from Schiit Audio in July ‘18 and used sparingly in my audio room in a second home. Love, love, love the smooth detail from an ink-black background this DAC provides - probably the best DAC I ever owned; but due to health issues must sell all but a couple prized pieces that will go to kids. Even though its a terrible cliche, Im kind of assuming that if you are looking at this, you will have read lots of reviews and are familiar with its excellent performance so wont list the specs here. Hope someone can put this outstanding piece to good use. You will absolutely love the sound.

Selling this beast of a headphone Amp Dac Pre Amp by Audio GD. This is the NFB 11-28 I won’t accept anything less than 20% off list. Comes with power cord and I can throw in a USB cable. May show slight signs wear but presents very well. Dragon not for sale nor any other equipment possibly shown except the Audio gd NFB 11-28 Direct from manufacturer. Fully discrete analog stages without any OPA and de-coupling caps in the signal path. Non- feedback ACSS analog amplifiers . Built with 4 pcs 20W (in total 80W) high speed Toshiba output transistors, able to drive most of the headphones out there . Total of 6 groups dedicated power circuits are used to purify the power supply. High-End grade parts built in , ALPS 27 volume pot . CMC pure copper RCA sockets ect. 3 channels digital input : coaxial / Optical / USB DAC output : RCA (User can setting with either variable level as DAC with preamp combo or fixed output level as dedicated DAC ) Headphone output : 6.3MM SE The NFB-11 applies the newest ESS high-end Sabre32 DA chip ES9028 which can support up to 32Bit/384KHz input . To be achieve the best performance of ES9028 , must work in current output mode. in voltage output model, there is -12DB THD+N loss . The standard current model design usually need 3 amps (OPA) , the first amp implements I/V conversion, the ES9028 output current signal to voltage signal . The second amp is responsible for conversion balanced signal ,to single-ended signal and implement the low pass analog filter , then go through the volume control fed to the third amp, (the headphone amp ). Every amp usually have two gain stages built in to the ES9028 chip . Signal must go through total of 6 gain stages and finally arrive at the output stage. The NFB-11 applies Non-feedback ACSS design. The ES9028 feed to the ACSS circuit without any OPAs . The ACSS circuit naturally working in current mode . The ACSS amp only have one current gain stage , the ES9028 output signal only goes through one stage . The shortest signal path can reproduce the best detail and dynamics almost without any sound coloration .It showes the real performance of the ES9028 dac. So our ACSS design is the best combo with ES9028 to achieve the best performance .

I am the original owner, and bought it new last year. I have too many amps, and am thinning the collection.Standard remote control included. From the website:The R28 NOS is a Fully Balanced solid state preamp with 9.5 watts per channel headphone amp and a resistor ladder DAC. We continue to be shocked at this level of sonic performance along with this feature set at this cost. Comparable products sell for $3000.00-$4000.00 range from the competition. The preamp or DAC alone is worth he price of the entire product. DAC’s of this quality typically sell for over $3000.00. The R28 features 8 fully discrete R2R DAC modules to combine into a real balanced push/pull digital decoder as well as 4 fully discrete real balanced DSD native decoders. The DAC uses two 90/98 MHz Accusilicon 318B femto clocks to provide ultra low jitter. The Amanero USB input supports 32bit / PCM384K PCM and up to DSD 512 asynchronous transfer. Clocking is done by a custom programmed FPGA. The whole digital circuit is built around one custom programmed FPGA and 5 CPLD programmable chip sets to separate the different circuits for avoid any interference in the data process in parallel mode. The R28 headphone amp has two gain modes, 12DB in the low gain position to drive higher efficiency headphones at over 95dB sensitivity, and 22DB on high gain with the full 9.5 watts to drive any lower efficiency phones such as the HifiMan HE6 at 85dB efficiency. The custom internal software that runs the unit is upgradable to improve sound quality in the future. All digital process mode settings are accessible by buttons on the front. The analog output stage is superb and has a tremendous effect on any DAC’s sound quality. After the D/A conversion by the R2R D/A modules the analog signal is run by fully discrete matched-transistor output stages. These high speed special ACSS output stages are zero-feedback and a current driven design as opposed to the voltage design of most other DAC’s. They are Special because almost all other designs need to convert the signal multiple times from and to current or voltage, resulting in less detail and a less defined sound stage. The Output stage in the R28 has 4 pairs of 15W transistors to offer tremendous output capability. This Diamond Differential design avoids switch distortion. It works in full Class A mode but doesn’t draw large idle current. This balanced drive design lowers noise and distortion and improves the sound stage presentation and transparency.

Audio-gd NFB-12 Headphone AMP/DAC Preamps This item is pre-owned and may show some slight signs of wear due to normal use. This item is in good condition overall. Tested and is 100% fully functional. Please look at the photos to make your own determination of this items condition

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

This ADCOM GDA-700 Digital-to-Analog Converter with HDCD is a top-of-the-line unit that offers exceptional audio quality and versatility. It has four different audio inputs including Coaxial Digital, Digital Optical TOSLINK, AES/EBU XLR, and S/PDIFF, AES/EBU input formats. It also features Dual Burr Brown PCM-1702P, Phase Inverstion Switch, Digital, and Pacific Microsonics PMD-100 HDCD, making it a great choice for audiophiles. This unit is in excellent working condition and has been thoroughly tested to ensure that it meets the highest standards of quality. Whether youre looking for a new digital-to-analog converter for your home theater system or simply looking to upgrade your audio setup, this ADCOM GDA-700 is an excellent choice. I purchased this item new and was in my 2 channel system for years. Works perfect. Thanks

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

I am the original owner, and bought it new last year. I have too many amps, and am thinning the collection.Standard remote control included. From the website:The R28 NOS is a Fully Balanced solid state preamp with 9.5 watts per channel headphone amp and a resistor ladder DAC. We continue to be shocked at this level of sonic performance along with this feature set at this cost. Comparable products sell for $3000.00-$4000.00 range from the competition. The preamp or DAC alone is worth he price of the entire product. DAC’s of this quality typically sell for over $3000.00. The R28 features 8 fully discrete R2R DAC modules to combine into a real balanced push/pull digital decoder as well as 4 fully discrete real balanced DSD native decoders. The DAC uses two 90/98 MHz Accusilicon 318B femto clocks to provide ultra low jitter. The Amanero USB input supports 32bit / PCM384K PCM and up to DSD 512 asynchronous transfer. Clocking is done by a custom programmed FPGA. The whole digital circuit is built around one custom programmed FPGA and 5 CPLD programmable chip sets to separate the different circuits for avoid any interference in the data process in parallel mode. The R28 headphone amp has two gain modes, 12DB in the low gain position to drive higher efficiency headphones at over 95dB sensitivity, and 22DB on high gain with the full 9.5 watts to drive any lower efficiency phones such as the HifiMan HE6 at 85dB efficiency. The custom internal software that runs the unit is upgradable to improve sound quality in the future. All digital process mode settings are accessible by buttons on the front. The analog output stage is superb and has a tremendous effect on any DAC’s sound quality. After the D/A conversion by the R2R D/A modules the analog signal is run by fully discrete matched-transistor output stages. These high speed special ACSS output stages are zero-feedback and a current driven design as opposed to the voltage design of most other DAC’s. They are Special because almost all other designs need to convert the signal multiple times from and to current or voltage, resulting in less detail and a less defined sound stage. The Output stage in the R28 has 4 pairs of 15W transistors to offer tremendous output capability. This Diamond Differential design avoids switch distortion. It works in full Class A mode but doesn’t draw large idle current. This balanced drive design lowers noise and distortion and improves the sound stage presentation and transparency.

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

Unit is in great condition with box.

Audio-GD NFB-12 DAC/ Headphone Amplifier w/PowerThis item is pre-owned and may show some slight signs of wear due to normal use. This item is in good condition overall. Tested and is 100% fully functional. Please look at the photos to make your own determination of this items condition.

Vintage ADCOM GDA-700Digital-to-Analog Converterwith HDCDExcellent ConditionFully Functional Guaranteed About This ADCOM GDA-700 D/A Converter: This ADCOM model GDA-700 is a tested fully functional Digital/analog processor with HDCD features. It is in virtually excellent cosmetic condition. An original printed ADCOM GDA-700 Owners Manual along with some brochures and the original unfilled warranty card is included. Includes the AC power Cord (120 VAC USA plug version).This ADCOM GDA-700 is known for its terrific bass, a great sense of pace, and open and spacious soundstage...wide dynamic expression and smooth...refined treble in which RH praised (in Vol.17 No.3).Features of the D/A Converter are:The ADCOM GDA-700 is housed in a standard U-shaped chassis, with a top cover held on by Mark Levinson–style countersunk Allen screws in front and Philips screws in back. The inside of the cover is fitted with a layer of damping material.Pacific Microsonics HDCD process decoder/filter.. Ultra-Analog AES21 receiver module.Dual Burr Brown 20-bit digital-to-analog converters.Class-A biased, direct coupled (no capacitors) analog output stage.. Over 13,000µF of power supply filter capacitance.Balanced and single-ended analog outputs.Toroidal transformer used for audio section.Independent transformer for digital section.Anodized aluminum front panel.Heavy gauge steel chassis for greater durability.GFA-535II Specification:DIGITAL SECTION Input Formats: S/PDIF, AES/EBUInput Type: S/PDIF Optical (TOSlink x1), S/PDIF Coax (RCA x2), AES/EBU (XLR x1)Input Isolation: Transformer coupledInput Decoding: Ultra-Analog AES21Digital Filter: Pacific Microsonics PMD-100 HDCDResampling Rate: 8x (352.8kHz for 44.1kHz input)DAC Type: Dual Burr Brown PCM-1720PResolution: 20 bitsPhase Inversion: Digital Domain (manual selection)ANALOG SECTION frequency Response: DC to 20kHz +0, -0.5 dBTHD: 0.009% (20-20kHz, full scale)Signal to Noise Ratio: 102 dB (20-20kHz, unweighted), >105 dB (20-20kHz, A weighted)Dynamic Range: 98 dBChannel-to-Channel Crosstalk: 106 dB (20-20kHz), 112dB (20-20kHz)Output Voltage: 2.234 V RMS (full scale)Output Impedance (Unbalanced): 77 OhmsOutput Impedance: (Balanced): 150 OhmsOutput Format: Balanced, UnbalancedOutput Type: Balanced (XLR x2), Unbalanced (RCA Coax x2)Output Mute: Relay activated (Power, Unlock)DAC Type: Dual Burr Brown PCM-1720PPower Consumption (maximum): 25 Watts GENERAL Power Supplies: U.S.A. & Canada AC 115V 50Hz/60HzChassis Dimensions (W x H x D): 432 mm x 76 mm x 267 mm (17 x 3 x 10-1/2)Maximum Dimensions (W x H x D): 432 mm x 76 mm x 292 mm (17 x 3 x 11-1/2)Weight: 4.5kg (10lbs)Weight Packed: 5.9kg (13lbs.) Guarantee:This products has been fully tested and verified in good working condition. I want you to be fully satisfied with your buying experience from me and to keep your business and satisfaction. Cancellation & Returns Policy:Returns: This item offered includes a 30-day money back return; if for any reason you are not satisfied, just send it back for a full cost refund. Product must be returned in same condition as sent, with any and all accessories received. Cancellations: Any request made by a buyer to cancel a purchase after payment has been sent will result in a partial refund being issued to cover the cost of non-recoverable fees as charged to the seller. Payments & Shipping: I accept payment using eBays Managed Payments and will ship item(s) only to confirmed eBay addresses, please do not request alternative ship to address unless you register the address with eBay prior to buying item(s). Shipping is done by the next business day after payment is received unless otherwise noted. Your payment is expected by the close of the sale. International Buyers: I do sell internationally using eBays Global shipping program. This is a third party exporter that will determine the cost for shipping and collecting any duties for sending this item to your country. Please Note: Import duties, taxes and charges are not included in the item price or shipping charges. These charges are to be paid by the buyer. Buyer is responsible for checking your countrys customs office to determine what these additional costs will be prior to bidding/buying. These charges are normally collected by the delivering freight (shipping) company or when you pick the item up do not confuse them for additional shipping charges. We do not mark merchandise values below value or mark items as gifts - US and International government regulations prohibit such behavior.

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

Another great sounding DAC on offer here. Specs were and still are impressive for the time. Highly versatile box featuring a headphone amplifier with DAC and can also act as a preamplifier as well. 3 inputs: Optical, Coaxial RCA and USB. Sounds and looks great! What you see is what you will receive. If you need a power cable, let me know after purchasing and Ill find one to throw in. Will be carefully packaged for safe transit. Lower 48 domestic sale only. No international orders. This is a 120v unit! http://audio-gd.com/Pro/Headphoneamp/NFB11/NFB11EN.htm

Silver Schiit Yggy Upgradable DAC - Some small marks, but in great condition. Serviced for Unison USB a year or so ago. Condition 8.5/10. - Analog 2 - Unison USB - OG DAC You can send this in for a chassis upgrade and reactivate the warranty for 2 years. Same if you opt for More is Less or Less is More on the DAC.

Dose NOT Power on SOLD AS IS PARTS OR REPAIR ONLY

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.

Dose NOT Power on SOLD AS IS PARTS OR REPAIR ONLY

Selling my well used Audio-GD R27 2021 - wish I could keep it, but my equipment stable is getting crowded. I upgraded the stock feet to thicker and heavier ones to prevent slippage when I plug/unplug cables, and for better cooling. All internal stages run in class A so it does get quite warm. The sound signature also leans a little warm, so I recommend it in combination with solid state equipment. I used it for a variety of scenarios:Fixed DAC outputting to a separate analog all-in-one stage DAC and digital preamp supporting a First Watt J2 power amp and standalone powered subwoofer Headphone amp Internet streamer (with a Wiim Mini attached to the toslink input)USB input from a PCIIS input from a Audio-GD DI-20HE

This is the original Unison USB version! Bought this straight from the Schitter demo floor. This is the highest end DAC they have with many preferring the original versions tuned by Mike Moffat. But overall, she looks fantastic! Pic is for ref only! Introducing the Schiit Audio Yggdrasil OG DAC, a top-of-the-line power amplifier with USB audio inputs. This model is a floor model directly from Schitter, and boasts of analog features. It is a great addition to your home audio system, providing exceptional sound quality and versatility. Perfect for music enthusiasts and audiophiles who want to elevate their listening experience.

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.