To purchase gfa5802 spares or accessories, please contact the company via their website or visit an authorised retailer. Make offer adcom gfa 5802 stereo power amplifier basic things you need to know about home audio power amplifiers its easy to purchase a new or replace stereo components and hook it all up for fantastic results. Make offer adcom gfa5802 stereo power amplifier basic things you need to know about home audio power amplifiers its easy to purchase a new or replace stereo. Enough time for the rolling stones to release 11 new records 28 for neil young. A pure class ab power unit, driven in parallel to deliver 450 wattschannel into 8 ohms with impeccable quality. My l, r and center are all biampable, so this is the direction i plan on going. The amplifier is very smooth, producing good inner detail.
While developing the new gfa585se, every single part was put under the microscope to create. My guess is most of the difference is related to the 5802 being biased much more in to class a operation. I do not service the adcom gtp preamps like the gtp400, gtp450 and gtp500. I want to rework the jbl 4408as because i think they are a little tinny on the top end, but from what ive read from jim is that its not the tweeters but crossover components. I dont own this but ive used it at a studio with a set of tannoy 8s i believe. Download the adcom gfa5802 manuals for free hifi manuals. Adcom gfa5802 manual stereo power amplifier hifi engine. The original adcom gfa555 stereo power amplifier hit the market in 1985. The adcom gfa 5500 is likely the best value in the market. I currently use a gfa 555 with a pair of jbl 4408as and its loud and clear.
View and download adcom gfa5802 owners manual online. My editor felt it was time to survey a handful of what might be called entrylevel highend amplifiers. Polk lsi9 lsic adcom gfa 555ii oppo bdp95 denon duration. The adcom gfa2 stereo power amplifier features a stable, lownoise, lowdistortion front end using differential fet amplifiers. I have used an adcom gfa545 and gfa555 and both are great amplifiers. Looking sort of like a black ice cube on steroids, it combined several interesting technologies. The adcom gfa5002 is a power amplifier in the solid state amplifier category. Jul 29, 2014 adcom gfa555 power amplifier by anthony h. Below you will found our manuals on the adcom gfa5802. The gfa 555 mkii was said to sound like a krell in an old stereophile mag years ago. Adcom gfa585 repair service the repair service covers any repair of the adcom gfa585 power amplifier. The design by nelson pass produces a very good soundstage with strong inner detail and a smooth high end compared to many bipolar output designs.
Tested and guaranteed adcom gfs6 6 way stereo speaker selector. The gfa 5802 runs pretty hot, with the heat sinks close to 125 degrees f. The lowestpriced item that has adco used or worn previously. Unpacking before your gfa 585se left our plant, it was carefully inspected for physical imperfections and tested for all electrical performance parameters as a routine part of adcom s systematic quality control. The gfa5802 service manual notes on page 4 that a number of the mosfets in the amplifier are matched to ensure proper performance for repairs requiring.
The adcom gfa5800 is a stereo power amplifier for your passive monitors. From my talks with designers and other audiophiles, it is clear that the state of the art in power amplifiers is about to change. The adcom gfa 5800 is a stereo power amplifier for your passive monitors. Adcom high performance audio amplifiers, preamplifiers and. Enormous power at an affordable price is what this amp is all about. A computer model mimics the reactance of the very difficult speaker and duplicates the actual phase angles of the voltage and current throughout the entire audio range. The adcom gfa 5802 was designed for adcom by nelson pass. A significant step up from their classic watt gfa online by marrian zhou 4 days ago. For last 3 years we repaired more than 100 gfa 565 amplifiers. All three of these components were conceived as an advanced statement of adcoms long standing philosophy of providing exceptional performance for the money. In general, and this is purely for the two channel adcoms, they have always made a point of having excellent current capacity, a forgiving nature for some difficult impedances, and really well considered transformers.
Unfortunately all gfa 565 gfa 585 amplifiers have that problem, no exception, so you need to service all gfa 565 gfa 585 amps you have in your system. The gfa 5500 runs warm and can be mounted in a cabinet. You will receive a huge set of various service manuals, owner manuals, schematics andor parts list on dvds. The adcom produces a very deep and wide soundstage. It may sound like i was not very impressed with the adcom gfa7700, but this is not the case. Adcom gfa5800 sm service manual download, schematics, eeprom. The adcom gfa 5802 was designed for adcom by nelson pass leveraging the international rectifier hexfet t03 output devices. Adcom gfa5503 amplifier overview and full product specs on cnet. There can be several problems in the amp but most of gfa 585s have problem with leaky electrolityc capacitors.
While developing the new gfa 585se, every single part was put under the microscope to create. Adcom gfp555 gfa2535 gft555ii audiosource eq eightseries ii denon dp59l denon 301mkii. A 300wpc monster, with 16 hexfet output devices per channel. Detail is excellent without being bright like some competitors. Adcom gfa5500 manual stereo power amplifier hifi engine. Rediscovery, adcom gfa 555 mkii page 2 steve hoffman. View and download adcom gfa5802 service manual online. The highs have gotten so smooth with the classe, that i dont need a tube preamp anymore in my system. And there wasnt a whole lot of difference between the 555 mki and mkii. While they are nice units for the price, they were adcoms budget product line, and are not up to the same quality standards as the gfp models, and are unpleasant to work on. Gfa585s are excellent power amplifiers, but over the years your amp may need a service or repair. The adcom performed at a peer level and produced superb results.
The other members include the gfp750 preamp and gcd750 single play cd unit. Service manuals, schematics, eproms for electrical technicians. To open downloaded files you need acrobat reader or similar pdf reader program. Adcom gfa 5802 power amplifier repair and restoration. Adcom high performance audio amplifiers, preamplifiers. Posted on october 6, 2015 january 26, 2016 by hoppesbrain just some thoughts and pictures from this adcom gfa5802 ive just restored for jeff in washington. The amp has a very high dampening factor, is a high current design and uses 3 gain stages as opposed to 5 like many. Nelson pass designed these amps with 3 vs the 5 gain stages used by many manufacturers which possibly leads to the smoother yet more transparent sound quality. I currently use a gfa555 with a pair of jbl 4408as and its loud and clear. Perfect for all repairservice shop or audio video professionals users that want to have a lot of adcom.
Adcom gfa5300 sm service manual download, schematics. The original adcom gfa 555 stereo power amplifier hit the market in 1985. The adcom gfa1 is a power amplifier in the solid state amplifier category. Below you will found our manuals on the adcom gfa 5802. Apr 6, 1985 i am reluctant to call any given transistor power amplifier a best buy or breakthrough. The 5802 is a somewhat more transparent amplifier with a bit more authority compared to the 5500. Adcom gfa5802 sch service manual download, schematics. How to fix leaking capacitors in adcom gfa565, for good. Polk lsi9 lsic adcom gfa555ii oppo bdp95 denon duration. I will cop to being an adcom fan, and think they compare very favorably with brystons. Adcom has introduced new brand, most powerful stereo amplifier ever made before.
This was adcoms biggest and most expensive amplifier. From the beginning of the testing, i put the adcom gfa7700 up against some pretty stiff competitionamps costing up to more than twice as much. Adcom gfa5802 sm service manual download, schematics. Adcom home audio power amplifiers for sale in stock ebay. Adcom uses hex screws and they can be difficult to break loose. While you could apply this to the standard lx mod it clearly makes the most sense to add it to the elite version. Adcom ac515 owners manual english pdfadcom ac615 owners manual english pdfadcom ace315. This adcom gfa 5802 power amplifier is in fairly good cosmetic condition. Gfa 585s are excellent power amplifiers, but over the years your amp may need a service or repair. Adcom 8551 east anderson drive, suite 105 scottsdale, arizona 85255 480 6072277 voice 480 3489876 fax. The amp has signal sensing for auto turn on, as well as a 12 v trigger circuit.
The amp seems to do a great job of powering these monitors, and the owner of the studio mentioned that its the best amplifier he has heard from the monitors, which is something that can. Having purchased a gfa 5802 along with the matching gfp 750 and gcd 750 when they first came out, i can tell you that the preamp was the star of the show by a long shot. Adcom high quality service manuals user owner instruction. Enough time for a digital music revolution maybe peaking now. This is an extremely impressive amplifier designed by nelson pass using 32 mosfet hexfet output.
Each, in its way, can serve as a vital link in a system which, with carefully. This is my first step away from the receiver and into the world of seperates. The adcom gfa 5802 and its smaller brother the gfa 5300 are excellent sounding amplifiers based on a 3 gain stage design leveraging international rectifier hexfets. Enough time for most rock bands to burn out, fade away and then stage a comeback. The schematic is a technical drawing or diagram of your system, a perfect supplement to the service manual. Adcoms first electronic product, the groundbreaking gfa1 power amplifier, appeared in december 1979. Anyway, the 555 should sound just like the 545 only with more power in. It is capable of driving almost any load and delivers stunning dynamic range. Adcom gfa 5802 sch service manual download, schematics. All three of these components were conceived as an advanced statement of adcom s long standing philosophy of providing exceptional performance for the money. There can be several problems in the amp but most of gfa585s have problem with leaky electrolityc capacitors. For the baby adcom is one of the finest solidstate amps i have heard. The owners manual is used as an reference guide, instruction manual and instruction book.
Adcom gfa5802 sm service manual download, schematics, eeprom. Consumers and service centers can purchase service manuals for adcom legacy products online and download the document files within 24hrs after placing the order. The output stages of the gfa2 use highspeed bipolar transistors, and entirely separate power supplies for the two channels enable each channel to deliver its maximum power regardless of the status of the other. The gfa 5802 is part of a high end, high performance series of separate components from adcom. Well adcom gives you that champaign taste on a beer budget. The gfa 5802 although not bright, is a bit of a grainy sounding amp with very average bass and does not provide the kind of headroom you would expect with its stated power output. I have used an adcom gfa 545 and gfa 555 and both are great amplifiers. Oct 06, 2015 some notes about restoring a gfa5802 posted on october 6, 2015 january 26, 2016 by hoppesbrain just some thoughts and pictures from this adcom gfa5802 ive just restored for jeff in washington.
I measured wpc with both channels driven into 8 ohms, just before clipping. Perfect for all repairservice shop or audio video professionals users that want. The gfa5802 is part of a high end, high performance series of separate components from adcom. Adcom gfa 5802 pdf the adcom gfa was designed for adcom by nelson pass leveraging the international rectifier hexfet t03 output devices. In order to determine the performance of the gfa585se, adcom developed a computer model of a difficult loudspeaker load. If that is true, thats saying quite a bit about adcom. This website is not affiliated with or sponsored by adcom. Adcom gfa5802 valve amplifier, audiophile, gadget, history, vintage, products. Adcom gfa 585 repair service the repair service covers any repair of the adcom gfa 585 power amplifier. Adcom home audio amplifiers and preamps for sale in stock ebay. The adcom blows all of these amps away including the krell which is a.
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