ADCOM GFA-555 II Power Amplifier Parts or Repair Instantaneous Distortion Alert Untested. Estate sale find. It is really clean and in good cosmetic shape other than the ding seen on the front right. When turned on Instantaneous Distortion Alert light comes on the one channel

Used functions perfectly. Will ship via fedex

Good working , fair condition Adcom gfa 555 II

This is an outstanding Adcom GFA-555 II power amplifier from the estate of a local doctor. This powerhouse features 200 watts per channel and can be used in stereo or bridged mono. It is in excellent condition both cosmetically and functionally. Adcom makes some of the finest audio products on the market. This unit looks great and works flawlessly. It is a monster! Heres some info from the web:Via Stereophile ReviewThe GFA-555 does everything well, and most things exceptionally well. It provides superb, well-controlled bass with far better speaker load tolerance than most amps. Its midrange and treble are remarkably low in coloration. There is no hint of hardness, and none of the loss of inner detail common to transistor amplifiers.With the exception of the Krells, I have never heard a more detailed, natural, and extended upper four octaves in a transistor amp. The Adcom may even be a legitimate rival to the Krell; its brighter and more dynamic; and somewhat more open. And, like the Krell, it gives the impression, on really good material, that the amplifier simply isnt there. Nor is the Adcom romantic or sweet, like New York Audios new Moscodes. Rather, it offers natural upper-octave detail that the latter miss. Other amplifiers have similar upper-octave performance, but I unhesitatingly recommend the Mcom over the very stiff competition from Tandberg and Threshold.The Adcoms soundstage is sufficiently superior that even those who claim all power amplifiers sound alike might hear the difference. It comes very close to the better tube power amplifiers in providing detailed, stable, realistic imaging with natural depth. It is not an Audio Research D-250, but is extraordinarily holographic—I suspect almost embarrassingly so. This kind of soundstage has previously cost at least $2000.I am also highly impressed with this amplifiers dynamics. Once again, it is not going to survive a one-on-one with the Audio Research D-250 or Conrad-Johnson Premier Fives, but it rivals any transistor power amplifier in its power class that I have heard—including high-powered receivers or amps with trick power supplies—at any price. It provides these dynamics into virtually any load without bloat, restriction of sound, or change in timbre. For all the nonsense published by most manufacturers about driving complex loads, this amplifier actually delivers.The Adcom does not lose sweetness and detail as its power goes up. I am normally leery of transistor amplifiers rated much above 100 watts; they too often blur detail and harmonic information, and this sonic price tag is far more costly than the added power is worth. This does not happen with the Adcom unless the distortion lights are blinking, and they only blink when the amp is delivering well over its rated 200 watts per channel (8 ohms) or 325 watts (4 ohms). By comparison, once-outstanding high power amplifiers like the Hafler DH-500 now sound annoyingly veiled.AtlantaModern is offering this amp NO RESERVE, high bidder wins it regardless of price. Thanks and Good Luck! AtlantaModern Auctions Please be sure to view our other auctions for the best in vintage sound! _gsrx_vers_1680 (GS 9.8.3 (1680))

ADCOM GFA-555 II STEREO POWER AMPLIFIER.Working, excellent sound.DescriptionThe Adcom GFA-555 represents the most advanced thinking in audio amplifier design. At 200 watts per channel, it offers exceptional value and superior performance at a reasonable price.SpecificationsPower output: 200 watts per channel into 8? (stereo), 600 watts into 8? (mono)Frequency response: 10Hz to 20kHzTotal harmonic distortion: 0.04%Damping factor: 800Gain: 27 dBInput sensitivity: 1.75VSignal to noise ratio: 110dBSemiconductors: 42 x transistors, 2 x zener diodes, 13 x diodes, 2 x IC, 2 x diode bridgesDimensions: 185 x 432 x 310mmWeight: 16kg

Please Review all Actual Item Photos with eBays Zoom Feature for more Detail Condition. Pre-Owned in Excellent Condition. Tested & working. Light Wear Shown in Photos.

ADCOM GFA-555 II Stereo Power Amplifier.Working, great sound.MADE IN USA.ADCOM GFA-555 II THD at power limits at 1 kHz.It puts out a clean, continuous 265 watts per channel into 8 ohms.It puts out a clean 370.5 watts per channel into 8 ohms on tone bursts: a 10 ms burst of 1 kHz (10 cycles) at 1 per second: 77V Pk = 54.447V RMS = 370.5W RMS burst power at 2.3600 V RMS input (120.1V AC power input).I measure:0.002% THD at 200 W.0.0022% THD at 216 W (1.8V in)0.0028% THD at 241 W (1.9V in, 808W from wall at 117.5V)0.014% THD at 253 W (1.95 V in, 117.5V from wall)0.057% THD at 256.5 W (1.96V in)0.1% THD at 257.2 W (1.963 V in, 117.5V from wall)0.11% THD at 258W (1.965V in)0.18% THD at 259W (1.97V in)0.68% THD at 265W (2.0V in, 845W from wall)Unloaded, I measure 57V RMS at 0.1% THD (120.5 V RMS power

ADCOM GFA-555 II Stereo Power Amplifier.Working, great sound.MADE IN USA.ADCOM GFA-555 II THD at power limits at 1 kHz.It puts out a clean, continuous 265 watts per channel into 8 ohms.It puts out a clean 370.5 watts per channel into 8 ohms on tone bursts: a 10 ms burst of 1 kHz (10 cycles) at 1 per second: 77V Pk = 54.447V RMS = 370.5W RMS burst power at 2.3600 V RMS input (120.1V AC power input).I measure:0.002% THD at 200 W.0.0022% THD at 216 W (1.8V in)0.0028% THD at 241 W (1.9V in, 808W from wall at 117.5V)0.014% THD at 253 W (1.95 V in, 117.5V from wall)0.057% THD at 256.5 W (1.96V in)0.1% THD at 257.2 W (1.963 V in, 117.5V from wall)0.11% THD at 258W (1.965V in)0.18% THD at 259W (1.97V in)0.68% THD at 265W (2.0V in, 845W from wall)Unloaded, I measure 57V RMS at 0.1% THD (120.5 V RMS power

Hooked up speakers in Stereo and Bridge Mode There is a low humming noise coming from the speakers in both modes but not from the unit itself. UNIT HAS MINOR SCRATCHES AND PAINT WEAR (SEE PICTURES FOR REFERENCE) SOLD AS IS Selling for PARTS OR REPAIR

ADCOM GFA-555 ii Stereo Power Amplifier Tested for all key functions.Wear from normal previous use.Not included cables or any other accessories.See photos please.Every item we sell is evaluated by our technicians according to the R2v3 guidelines and is classified as the following: Cosmetic DescriptionC0Not CategorizedC1Damaged (For materials recovery)C2Used Poor – Heavy use and ageCosmetic blemishes are significant, such as multiple heavy dents, may require repairDamages to latches, hinges, keyboards, etc. are prevalent Critical parts are missingC3Used Fair (Moderate use and age)Cosmetic blemishes are consistent with wear, including multiple dents, discoloration, and light to heavy scratchesDamage to latches, hinges, keyboards, etc.Some parts, panels, bezels, or covers may be missingC4Used GoodCosmetic blemishes include scratches and/or other surface imperfections from consistent use, but equipment is in good condition overallMinor wear of labeling may be visibleSmall dents and small areas of discoloration may be present from the removal of tagsNo damage to latches or hinges, nor any missing parts, panels, bezels, or coversC5Used Very GoodCosmetic blemishes include minor scratches and/or other surface imperfections from consistent use, but equipment is in good conditionMinor wear of labeling may be visibleMinor dents and areas of discoloration from the removal of tags No missing partsC6Used ExcellentOverall excellent cosmetic conditionMay have light scratches or other minor blemishes from normal wearMinor cosmetic blemishes have no impact on the system’s overall functionality or performanceFully cleaned with all non-original labels removedNo missing partsC7Certified Pre-Owned (Seller or Manufacturer Refurbished)Used equipment that has been fully restored to like-new condition with warrantyFully cleaned and cosmetically repaired with no blemishesNo missing partC8UnusedNew, out of box, unused equipment removed from original packaging with no signs of wear or alterationC9New Open BoxNew, unused equipment in original packaging where factory seals have been brokenNo signs of wear or alteration Product Functionality DescriptionF1 Collectible or Specialty Equipment (Core Requirement 6.(e)(3)(A)) Collectibles are rare, vintage, and no longer manufactured or supported by the OEM Specialty equipment are rare and specialized equipment not generally available in retail May have broken or missing partsF2 Verified Specialty Electronics (Appendix D) Verified removed from operation with no known defects in functionality No physical damage or defects No corrosion No missing parts Part numbers and serial numbers verified accurateF3 Key Functions Working (Appendix C – Test and Repair) A subset of the primary functions of the device that an ordinary user of the device expects to function are verified working through manual or software tests Software may not be loaded or configured Hardware required for key functions to be tested may have been removed after testing (e.g. Hard Drive) May be missing components or parts not essential to key functions Secondary functions may not be tested or working May not include Focus Materials (e.g. Battery) that are not working or not tested All missing components or parts will be listed for each itemF4 Hardware Functional (Appendix C – Test and Repair) All hardware is tested and verified working through manual or software tests No missing or damaged components or parts Software not loaded or configured No hardware defectsF5 Refurbished (Appendix C – Test and Repair) All functions tested and verified working through software tests Loaded and configured with legally licensed software for full operations Software test results are available No hardware or software defectsF6 Like New (Appendix C – Test and Repair) All functions tested and verified working through software tests Repaired with OEM original parts Loaded and configured with original manufacturer’s legally licensed software for full operation Meets OEM specifications for full original functionality Software test results are available Zero defects Please read the following terms and conditions before purchasing this item:We make our best effort to inspect items for sale, create accurate descriptions and provide photographs that fairly and adequately depict the item at the time of sale. Please note if purchasing electronic components, it is the responsibility of you the customer, to ensure current drivers/software are available for your operating system. Returns: We offer customers a 30-day warranty on most listings (restocking fee may apply). Please notify us via eBay message of any problems. The customer pays return shipping costs. Please make note of the tracking number from the shipping carrier when returning items.All items must be returned in the same condition, packaged properly.New items are accepted for return as long as the manufactures packaging is unopened. If opened, the refund amount will be assessed upon return.The refund price will exclude the initial shipping costs on items with “free shipping”.Shipping:Packages are shipped within 48 hours of payment receipt (excluding weekends and holidays). Our goal is to earn a 5-star rating from every customer!We want you to be 100% happy with your purchase. 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Used: An item that has been used previously. The item may have some signs of cosmetic wear.ColorBlackMPNDoes Not ApplyYear Manufactured2008Audio OutputsBanana Speaker JacksNumber of Outputs2Amplifier ClassABBrandADCOMTypePower AmplifierAudio InputsStereo L/R RCANumber of Channels2Number of Inputs2ModelAdcom GFA-555 IICountry/Region of ManufactureJapanPower200 W This ADCOM GFA-555 II Power Amplifier is a high-quality device that provides clear and powerful audio outputs. With its two banana speaker jacks, it allows you to connect your speakers and enjoy your favorite music or movies with great ease. This amplifier has a stereo L/R RCA audio inputs, which ensures that you get the best quality of audio inputs. Additionally, this power amplifier has a high-current output, which provides a reliable and stable power supply to your devices. It is manufactured in Japan and has a model number of Adcom GFA-555 II. This amplifier is perfect for anyone who wants to enhance their home audio experience

ADCOM GFA-555 II Power Amplifier high current amp. Some scratches/markings, etc. The thermal protection light stays on. Selling for PARTS OR REPAIR.

item is in good condition with some signs of wear. Comes with unit only. Check photos for details.

ADCOM GFA-555 II Power Amplifier high current amp. Some scratches/markings, etc. See pics.

Welcome to Audio/Video Archives, the largest home of audio literature available on eBay! This Advertisment is an exact reprint from 1991, it is printed on matte photo paper and is in Excellent condition! The Picture is the picture of the actual item. It is a beautiful piece of Audio History. I have THOUSANDS more from every major brand of Audio from 1950 up to now. ---Satisfaction is GUARANTEED at AV Archives! Take a look at my feedback for satisfied customers! I have been open since 2007 and have sold THOUSANDS of Ads, Reviews, and Brochures to satisfied customers. ---I Ship Worldwide and combine shipping, each additional item is just $1 after the first is paid. ---Each Page is 8.5 by 11 unless otherwise noted in title. ---Single Page, Single Sided Ads, unless otherwise noted in the title. ---These Ads are perfect for framing and placed in your Audio Room. ---I have a HUGE Vinyl Record Store with Thousands of Collectable records, and MANY First Pressings/Audiophile LPs. Just click on my Vinyl Record Store link on the left under categories. Email me for any specific questions, You will hear back from me usually within 4 hours, THANK YOU! Greg Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items.

Adcom gfa 555ii amplifier. Its used and have scratches but functional and sounds really good. Please refer to pictures for condition. All sales are final.

This is a great power amp. Tested and working as it should, the inner workings of this are not an issue! There is paint loss to the side panels and it looks like corrosion may be trying to creep in. It is priced with that taken into consideration. The specs on this piece are impressive with output power at 200W into 8ohms (stereo) and 600 into 8 ohms (mono), all continuous power. Gain 27 dB, sensitivity 1.75V. I don’t have a year on this but it was manufactured from 1990-1995. Feel free to message with questions. The photos represent this item, so please go over them carefully and PLEASE ASK BEFORE YOU PURCHASE if you have any questions. This is a vintage item and is SOLD AS IS! Please consider giving our shop a follow, we still have so many fun things to list! Auctions run Sunday-Sunday and we are happy to combine shipping on multiple won items. As always, thanks for looking, and have a great week!

ADCOM GFA -555 II Power Amplifier. Tested. Nice Looking and Operating Amp! Operationally tested on an audio system, and it performed as it should. The cabinet is in very nice condition with a few small finish imperfections on the front panel. No dings or scratches. Power output: 200 watts per channel into 8 (stereo), 600 watts into 8 (mono) Frequency response: 10Hz to 20kHz Total harmonic distortion: 0.09% Damping factor: 800 Gain: 27 dB Input sensitivity: 1.75V Signal to noise ratio: 110dB Semiconductors: 42 x transistors, 2 x zener diodes, 13 x diodes, 2 x IC, 2 x diode bridges Dimensions: 185 x 432 x 310mm No returns accepted. Please review pictures and ask any questions you might have.

ADCOM GFA-555 II Power Amplifier Used - Tested & Working in Great Condition! This is backed by our 30 day money back guarantee! Sale includes only items pictured Please read all policies below prior to sending an offer or making the purchase.Auction Policies Used Item Disclaimer- Because this item is used it will show minimum to moderate cosmetic wear. Please view each of the pictures to get a better idea of condition specifics. Please ask any questions regarding the condition of the item prior to making an offer or purchase. Customer Service:5 Star service is our number one priority. Our office hours are Monday-Friday 9:00AM to 5:00PM. Feel free to contact us anytime and we will do our best to address any questions or concerns. Shipping: There will be a shipping surcharge for items shipped to Alaska, Hawaii, and Puerto Rico. Please contact us for total cost before purchase. Thank you.Your purchase will be processed, professionally packaged, and quickly shipped by our shipping department. Your item(s) will be shipped via USPS, FedEx, or UPS. NOT ALL ITEMS ARE ELIGIBLE TO BE SHIPPED TO A P.O. BOX.A HOME OR BUSINESS ADDRESS MAY BE REQUIRED.PLEASE CONTACT US PRIOR TO PURCHASEIF A P.O. BOX IS YOUR ONLY OPTION Customer Pick Up: If you are in or around the Seattle area and would like to pick your purchase up in person, you can come by and pick it up during business hours. Just send us a message with the listing number and we will give you our address. Returns due to Compatibility or Buyers Remorse: Customers are responsible for checking compatibility of all parts. Returns due to incompatibility or buyers remorse will be charged a 20% restocking fee. Refunds will be processed upon return of item in good working order and verification of serial numbers. Warranty Info: Warranties, if available, are listed in each item description. If you do not agree to these terms, do not make the purchase or send an offer.

For your consideration an enhanced Adcom GFA-555ii (Which I affectionately call the GFA-575). The unit is in A+ condition. The following upgrades have been made. • Potential upgrades: (Not yet made to the unit)• Install Soft-start board.• Install larger 22,000uF or 27,000uF main caps(Soft start board needed as well as upgrading the bridge rectifiers to 35A or50A)• Install speaker protectors/ relay The output now is over 320 watts RMS into 2 channels at 8 ohms and 615watts x into 4 ohms. Tested with a steady state sinewave at 20Hz prior to clipping. My AC mains had dropped to 115v, or this output might have been more.The design vision for this upgrade was to make the design more reliable, and able to drive low impedance loads with Authority with lower distortion and more power.

ADCOM GFA-555 II (Most famous sought after classic by the discriminating audiophile) BETTER THAN NEW INSIDE - BEAUTIFUL CONDITION OUTSIDE If you would like to save on this use the blue letters on last picture Here is another fine offering from the Audio Labs of Morris Electronic Repair Boutique This ADCOM GFA-555 II is a very rare classic. Plus you will not find many of these around for the lucky people that own them keep them! The design and power is second to none. At 200 watts per channel into 8 ohms, this baby will light up your Wilson Audio Sophia Series 3 speakers or anything else you may have in quality speakers. This is a very HIGH CURRENT amp. This amp is the Nelson Pass redesign and upgrade from the 555. If you owned or liked the 555, you will love and go nut’s over the 555 II. The awesome sound stage and clean audio with super low THD, will knock your socks off and blow you away. I personally would put this 555 II up against the big boys like Krell - McIntosh - Jeff Rowland - Classe Audio - Etc. It will hold it’s own, if not easily surpass! BUT WAIT THERE’S MOREThis particular GFA-555 II is very special, it has been upgraded with a Brand New double sided audio driver board with all brand new audio grade 1% tolerance components. Make no mistake this GFA-555 II is not your Dad’s 555 II. It will surpass anything out there in the 555 II world. It’s sonic sound stage is nothing short of Awesome. If you have quality speakers & preamp to run this, you will lack for nothing in incredible listening pleasure from this power amplifier. This Amp is Perfection in Audio Reproduction. I am a one man shop, with 30 years as a electronic tech, so each piece of high quality audio equipment gets my personal attention, of which I repair, clean, adjust, and inspect everything as if I were keeping for my own. I have personally been completely through the internals of this 555 II power amp, insuring everything is to factory specs. I leave no stone unturned. So you can bid / buy with confidence knowing you are going to receive a very high quality amplifier in perfect condition electronically. This unit (after initial check out on a Sencore PA-81 analyzer) has undergone hours of testing under load, driven by a Carver CD TL3200 music source, into a Harman Kardon 825 pre-amp and pair of Paradigm Esprit B/P 8 ohm 300 w Towers. PLEASE NOTE: When I refurbish a amplifier, I don’t just repair the problem and sell it. I completely disassemble it, meticulously clean everything, (just check the pictures) I make the internals as close to new as possible, with the driver board being brand new with all new components. So that you will have a minimum of 25 years of enjoyment from your new amp, without component failure or component degradation. (Excluding) shorted speaker wires, inferior speakers that can’t handle the power, or turning up the volume to the degree that you can fry eggs on the rear heat sinks. Or blow the windows out in your house. :-) All four electrolytic’s 47uf @160wvdc have been upgraded with new Nichicon electrolytic capacitors 100 uf @160wvdc on the power output PCB’s. with added .1 uf 400 wvdc mica’s in parallel. The driver bias voltage was adjusted to 9.5 mv per side.The rail caps have been tested as follows:C1 rated at 15,000 uf and allowable 9,000 ua leakage. Tested 18,000 uf / 340 ua.C2 rated at 15,000 uf and allowable 9,000 ua leakage. Tested 18,100 uf / 380 ua.C3 rated at 15,000 uf and allowable 9,000 ua leakage. Tested 18,100 uf / 390 ua.C4 rated at 15,000 uf and allowable 9,000 ua leakage. Tested 17,300 uf / 320 ua.The ser.# of this unit is 402020523This unit draws .5 amps at 116 vac at idleThe DC offset is .2 mV on the left and .2 mV on the right this is super low, almost perfect. This 555 II is bridgeable to operate in mono block mode, just by switching a small switch on the back plate. PLEASE NOTE: I only ship to the US, No international shipping. As always I pack everything with the best of materials, so as to thwart the gorilla UPS handlers. It will arrive alive and unscathed. The Service manual & Owner manual will be included (reproduced from the original) along with a cover letter, so in the unlikely event you should have an issue, or even a general question you can contact me directly at my real E address. Thank you for taking the time to read all my verbiage, for this is one High Current Fantastic Powerhouse of an amplifier in like new, excellent condition. Any issues you should have I take care of them, Pronto! Period! This is why I maintain a 100% positive feedback.I answer all submitted questions.

For your consideration an enhanced Adcom GFA-555ii (Which I affectionately call the GFA-575). The unit is in A+ condition. The following upgrades have been made. • Potential upgrades: (Not yet made to the unit)• Install Soft-start board.• Install larger 22,000uF or 27,000uF main caps(Soft start board needed as well as upgrading the bridge rectifiers to 35A or50A)• Install speaker protectors/ relay The output now is over 320 watts RMS into 2 channels at 8 ohms and 615watts x into 4 ohms. Tested with a steady state sinewave at 20Hz prior to clipping. My AC mains had dropped to 115v, or this output might have been more.The design vision for this upgrade was to make the design more reliable, and able to drive low impedance loads with Authority with lower distortion and more power.

For your consideration an enhanced Adcom GFA-555ii (Which I affectionately call the GFA-575). The unit is in A+ condition. The following upgrades have been made. • Potential upgrades: (Not yet made to the unit)• Install Soft-start board.• Install larger 22,000uF or 27,000uF main caps(Soft start board needed as well as upgrading the bridge rectifiers to 35A or50A)• Install speaker protectors/ relay The output now is over 320 watts RMS into 2 channels at 8 ohms and 615watts x into 4 ohms. Tested with a steady state sinewave at 20Hz prior to clipping. My AC mains had dropped to 115v, or this output might have been more.The design vision for this upgrade was to make the design more reliable, and able to drive low impedance loads with Authority with lower distortion and more power.