Adcom gfa 555 nelson pass. Hersteller: Adcom Modell: GFA-555; Baujahre: 1985-1990; Hergestellt in: USA; Farbe: schwarz, weiß Dec 1, 2022 · Despite the success of the GFA-555 (the initials stand for ‘Great F**cking Amplifier’, by the way), Adcom was taking a hit on warranty returns for it, because for some reason they had decided not to use the specific driver transistors Pass had specified (Motorola MJE15030/31 pairs) and instead had substituted 2SA1011/2SC2344 transistors. The original 555 was designed by Nelson Pass Nelson Pass. Oct 16, 2015 · First, neither Nelson Pass or our EchoWars recommend mod'img them other than ensuring that they have good elyticaps and fuses, acceptable offset, and proper bias. II was similar to the Pass designed 555 except for the drivers. Stock No. Adcom GFA-555ms Power Amplifier. Sep 3, 2021 · Saying all of that, someone local is selling their GFA 555 and it's about as pristine as it gets including the owners manual. ADCOM GFA-555 Front ADCOM GFA-555 Rear Reports Links Apr 23, 2021 · From my experience with Adcom, their boards are printed with nice clear text. Aug 14, 2016 · Nelson Pass-designed stuff is certainly no slouch in the sound department. Nelson Pass. Allgemein Produktart: High End Hochleistungs Endstufe . 67. I, while preserving its virtues: excellent imaging specificity, a deep, well-defined bass, and a superb sense of dynamics. At 200 watts per channel, it offers exceptional value and superior performance at a reasonable price. The heatsinks were much more substantial than the original and construction overall much better. Most of th Sep 7, 2007 · I know old post, but I have to set the record straight for the archives. Dec 14, 2003 · There has been much discussion about the Adcom GFA-555. AND it will be far better than a refurbed Adcom Sep 3, 2022 · Talking about the old Adcom 555, but it is a Pass design! I've been selling replacement boards for the GFA-555 for some time now, and I am about to design new versions with some subtle improvements. I don't have that amp so have just glanced at the stuff in passing. Feb 24, 2021 · Malheureusement je n'ai jamais franchi le pas sur l'Adcom et quelques part, j'ai toujours ce regret de ne pas l'avoir essayé. The ADCOM GFA-555 II is among the world's greatest audio power amplifiers of all time. Jusqu'à ce qu'ils redemandent à Nelson Pass un nouveau circuit. New posts Search forums Subscribe. Did Nelson Pass design the Adcom 555II amplifier for Adcom, if yes, then more questions. Adcom's later models did get some bad press, which was partly due to sub-standard components. a. This is the most desirable version, the revised Mk II released in 1990. I'm currently running a Croft Acoustics Integrated Phono amp. Feb 27, 2019 · This was a fun project! Adcom had a sensational success with the GFA-535 in the 80s and 90s. Il Re è tornato. NEW! ADCOM GFA-585SE CLASS A/B AMPLIFIER Dec 16, 2009 · Originally Posted by RushM3 /t/1207124/adcom-gfa-5500-vs-gfa-555-ii#post_17784742 Thanks for the info. The usual problem with a non working example is open 4 amp rail fuses on the driver boards, replace all four with 4 amp MDA ceramic type fuses. What the guys said above. II to be significantly more neutral as regards midrange and treble tonal quality than the Mk. This Adcom GFA-555 power amplifier is the first version, which means it was manufactured between 1985 and 1990 (the year the GFA-555 II was introduced); it also means this was designed by the legendary Nelson Pass (who is said not to have been involved with some subsequent versions of the design) The Adcom GFA-555 stereo power amplifier has a long history. Adcom GFA-555 power amplifier Anthony H. The ADCOM GFA-555 II is one of the world's greatest 200 watt-per-channel stereo power amplifiers, designed by the legendary Nelson Pass. Aug 16, 2002 · The 555Mk. This is a rare Silver one. After I completely hooked up the Adcom GFA-5500 that way like my Adcom GFA-555's are the 5500 sounded a lot smoother and much more toned down with much more clearity. It is designed by Nelson Pass who designed other brands of amplifiers like Threshold and Passlabs. Its performance is exemplary; I haven't heard any other amplifier surpass it today. 2sb817/2sd1047. Hard to go Daten []. The newer SE version is a redesigned amplifier that weighs 36 pounds and carries a list price of $1299. Still made in the US and the original 555 design only improved with little detail like accessible rail fuses and higher end input jacks. The link providedabove by ZeroG is to a thread in the DIY Audio forum where NP made a post confirming this, and alludes to designing the 535 and 545 as well. Since there are so many of these amplifiers on Ebay, can the design be Jun 26, 2023 · This Adcom GFA-555 power amplifier is the first version, which means it was manufactured between 1985 and 1990 (the year the GFA-555 II was introduced); it also means this was designed by the legendary Nelson Pass (who is said not to have been involved with some subsequent versions of the design). A great bargain! For 300 bucks, you got a true dual-mono amplifier designed by Nelson Pass. Aux US, l'ensemble a connu un vif succès et Il existe aussi des améliorations sur le GFA-555 dont celui de l'upgrader en double-mono. For many years I had an Adcom GFA-5802 which is a Nelson Pass design without the Nelson Pass price on the used market you should be able to get one for about $1,000. 7610762395869 Feb 14, 1992 · The Adcom GFA-545 (GFA stood for GREAT F****G Amp) designed by the legendary Nelson Pass (First Watt and Pass Labs) this was the best bargain audio in the world at the time. Jul 17, 2019 · Nel 1979 Adcom presenta quindi il proprio primo amplificatore, il punto di svolta però avviene nel 1985, quando venne lanciato il GFA-555 disegnato da Nelson Pass. Of course everything you can read about the new ones is marketing hype, etc. I do like that model though as it is a nice Nelson Pass designed amp. The Adcom GFA-555 represents the most advanced thinking in audio amplifier design. They may not be in competition with the best of the best, but they are certainly not "shit Dec 12, 2014 · THAT will bring the venerable design well into the 21st century and Sound like NO 555 before. Basterebbe solo questo nome a giustificarne il valore, addirittura più oggi di allora, ma l’amplificatore aveva oggettivamente caratteristiche interessanti: 200 watt per canale e Jul 20, 2019 · Humm, that's a hard question to answer. Il celebre progetto di Nelson Pass oggi torna in una nuova veste. Reviewed Jan 04th, 2015 by firthoffifth2523 Gfa-555Ms Is Rated At 200 W Into 4 Ohms, Takes Both Unbalanced And Balanced Inputs And Provides High Performance, Ultra Low Distortion Output Power All From A Neat Package. Je ne connais le 555 que par ouï-dire. La réponse du maître lui même. GFA555 front. The GFA-2 model provides 100 watts of high current power using dual power supplies to keep one channel from affecting the other. ADCOM earned worldwide acclaim with the GFA-555 – a power stereo amplifier designed by Nelson Pass. ADCOM GFA555 Service Manual. . [7] [8] Nelson also designed the GFA-5XXX MOSFET-based series of high-bias class-AB amplifiers for Adcom (i. Dec 23, 2021 · When Chenin retired, his son Alec took over the running of the company, and he and Ain brought in Nelson Pass to design the Adcom GFA-555. Soundstage is wide and deep with good detail. Aug 16, 2002 · Ok, time for silly questions/comments, it's Friday. This was a Bipolar Junction Transistor (BJT) based design. ) The Nelson Pass-designed Jun 26, 2023 · This Adcom GFA-555 power amplifier is the first version, which means it was manufactured between 1985 and 1990 (the year the GFA-555 II was introduced); it also means this was designed by the legendary Nelson Pass (who is said not to have been involved with some subsequent versions of the design). Great deals on Adcom Gfa 555. I own a lot of hi fi gear (life long hobby). com. These were 130 watt/ 140v devices. Feb 3, 2024 · Roy Hall showed me some of the new Adcom designs at CAF 2023 but all of the products were on static display. I have a question about thermal tracking. Sep 20, 2012 · Adcom made a series of quality power amplifiers culminating with the Nelson Pass designed 555. ) IMO. It's avaialble today for only about $350 used, so it's a bargain. ) are much better than the 4 digit newer models (5400 5800 etc. And the GFA-5802 was, as Leroy points out, the most prodigious of the lot! H9 knows all this history in great detail. The opening slate of equipment are updated and modernized versions of components ranging from the Nelson Pass designed Adcom GFA-555MS ($1,399) and GFA-555se ($1,699) and other models from the previous Jun 27, 2019 · I think the GFA-555 was designed by Nelson Pass (not the later versions of the 555). The GFA-555, introduced in March 1985, was a phenomenally successful product. At 200 watts per channel, it offers exceptional value with serious HI-FI sound. [9] [10] 6 days ago · GFA-555se power amplifier represents the pinnacle of ADCOM’s audio engineering. This is in excellent cosmetic shape , and it sounds amazing. There are also mods and upgrades that are out there. ADCOM GFA555 II Service Manual. e. The GFA and big brother GFA 5802 are MosFet (HexFet) based solid state amplifiers designed by Nelson Pass. Besides the well reviewed Adcom GFA-555, Nelson Pass had called the GFA 5800 that he designed the best sounding amp Adcom ever made. SALE! ADCOM GFA-555ms $1299! - New CLASS A/B 125 watts per channel in 8 ohms, premium RCA’s, and a detachable power cord. Full professional review continues Feb 16, 2024 · But it was the GFA-555, a power amplifier designed by Nelson Pass, that earned the brand worldwide acclaim in 1985. May 1, 2010 · It is a well known fact that NP designed the GFA-555. Dec 17, 2014 · Is there any advantage to buying the Adcom GFA-555 II vs. " Mar 5, 2019 · ADCOM 파워앰프 gfa-555-2 국내 메이져오디오 수입상 태영교역 정식수입품 ADCOM 파워앰프입니다. Not in the same league as a Krell, but not much is. Do some searches. ADCOM의 GFA-555는 Stereophile이라는 잡지에서 2002년에 발표된 stereophile 40주년 기 Oct 12, 2024 · SALE! ADCOM GFA-555SE $1599 till 10/15/2024! - New fully balanced CLASS A/B 200 watts per channel in 8 ohms with XLR inputs, premium RCA’s, and a detachable power cord. At the 1990 SCES, Adcom finally announced a revised version of the '555 to sell for $800, the GFA-555 II. II Adcom used beefier drivers i. I thought I would show what the Stereophile Mag. local pickup in NJ: Solid State Amplifiers: USD $450. Liner Notes. -5300, -5400, -5500, -5800). What other Adcom models did he design? b. So were the GFA-565 mono monsters. MHO of modern Pass amps is that he has attempted to voice them in various ways, where in the older designs he leaned more towards accuracy. I know these have a following because of the Nelson Pass input on these, or maybe that was the 555 II, but I know these amps also have their shortcomings due to no relays for the outputs. As for the GFA-555, GFA-545 ORIGINALS, they are widely considered the 'best' of those series as Adcom introduced 'noise' into Pass's design in later modelsalthough no deal breaker. What type of topology is used ? c. The Adcom amps are generally very well-regarded. ) Known for his work on brands including Adcom, Threshold, Pass Labs and his side project – First Watt, Pass has a perspective on the specialty audio business that few others possess. In the Mk. I think the horror stories began when Adcom cut Nelson Pass out of the loop and lesser engineers were tasked to upgrade/upscale the original designs. 0萬元 【杰士音響→中古二手買賣交換】美國ADCOM GFA-555 II大功率 . Designed by the legendary Nelson Pass, this amp has become a cult among studio operators. Tale amplificatore fa parte dei mostri sacri dell’alta fedeltà oramai da trentacinque anni e ha visto quasi contemporaneamente nel tempo affacciarsi alla ribalta altri costruttori Adcom was one of the champions of reasonably priced high end gear that played beyond its price point. Dec 1, 2020 · Nelson pass design circuit; Remarks . Jan 20, 2019 · daywalker702, As I understand it, the Adcom 555 II amps were designed by Nelson Pass and are stable down to 1 ohm. Jan 2, 2022 · the adcom gfa-555. Forums. Sep 8, 2007 · I have a GFA 535II (60 wpc @ 8 ohms) that I think sounds fantastic! The older Adcom amps with 3 digit model numbers (535, 545, 555 etc. Also they used a 33 ohm resistance across the driver emitters. Fast & Free shipping on many items! Adcom Gfa 555 for sale | eBay Apr 16, 2011 · The original Adcom GFA-555 was designed by Nelson Pass. It was an ADCOM milestone that became a classic step-up for budget amplifiers at that time. En deux mots, le 555 (I) est un design de Nelson Pass. The Adcom GFA 5800 is unlike most amplifiers as it uses only MOSFETs in the signal path. Also, understand that your 585 is a more complex amp (and more of a pain to work on) than the your 555. Je me contente d'un Stasis 2. (After having worked at Adcom since 1981, Ain moved to Polk in 1988, but came back to Adcom as Executive Vice President in 1991, before moving over to Boston Acoustics in 2003. It's a great time to upgrade your home theater system with the largest selection at eBay. Anyway, this is a fantastic Nelson Pass designed power amp. There is a lot of documentation on that amp. 7675179040989 Aug 16, 2002 · Granted the above thread is for an Adcom GFA 555, not a 585, but there is A LOT of great troubleshooting information there. More models of the same series: Pictures . Nelson Pass was brought in as consultant for the now legendary GFA-500 series amplifiers that were designed with an austere black finish, with white and silver models available as special-order options. 1. For those who desire the power finesse in a two-channel amplifier, look no further than GFA-555ms. Assuming it's solid, does anyone have opinions on this amp? I know it was designed by Nelson Pass and is highly regarded. I spotted an Adcom GFA 555 II in the window for $250. It was still just a shade and I mean a shade different in complete clearity and warmth than the GFA-555's sound. A friend picked up a GFA 5800 and I didn't think that it even sounded close to what mine sounds like! Oct 8, 2015 · An old-school electronics repair shop in my neighborhood is liquidating. Aug 23, 2015 · Hi Luigi. This amp was designed by audio legend, Nelson Pass. In the mid 1980s, Pass designed the well-reviewed Adcom GFA-555 amplifier. John Atkinson wrote: To sum up, I feel the GFA-555 Mk. However, even Nelson Pass has stated on DIY Audio that the Adcom 555 was not a great bridged amp. Ma anche dettaglio, timbrica raffinata ed equilibrio grazie al nuovo Progettista. Je crois que tu seras loin d' être déçu avec celui-ci. -Ken Rockwell. This is a beast, and it can push any size speaker with 200 watts per channel. 美國PASS LABS NELSON PASS設計的 Adcom GFA-555 II 旗艦 300W*2後級3. Designed by Nelson Pass, the amplifier weighed 30 pounds and cost about $680. 00: NJ : Jun 29, 2023: 5 : FOR SALE: Adcom GFA-555, first-generation Nelson Pass design, very good condition: Solid State Amplifiers: USD $510. The original version was introduced in March, 1985. The 5500 and 5802 have a very smooth midrange and top end compared to many bi polar based amplifiers I've owned. Jan 22, 2024 · Two updates of the classic GFA-555 are offered: the 2 x 125-watt GFA-555ms ($1,399) and 2 x 200-watt GFA-555se ($1,699, bottom in photo), an updated version of the original design, described as the pinnacle of Adcom’s audio engineering: “This Nelson Pass design broke ground when it came out in the 80’s, getting rave reviews and providing GFA-555se Finale di potenza – New version. I'm not sure how closely the design follows the original Nelson Pass 555's design, etc. That these amplifiers are much in demand after so much time is strong testament to their value and durability. Their reply is below: The GFA-555se, end of story! amplifier. . It also can be bridged for a brutal 600 watts at 8 ohms mono output. Feb 20, 2021 · Adcom GFA-555 (not the II) and the GFA-565 mono-blocks are by far the best sounding designs by Nelson Pass for the money. Trasformatore toroidale Plitron. jpg. It is popular for its richness of detail and depth as well as its warm but still neutral frequency response with a very low signal-to-noise ratio. Only caveat being that it will not be inexpensive and one could Bin the Adcom and Buy a used Pass Labs amp for less or similar coin. If you're not familiar with the work of Nelson Pass, he's something of a living legend in the world of audio amplifiers and was/is the guy behind past companies Threshold, Forté, and the Nakamichi Stasis amplifiers. thought of it. This amplifier sold for around $600 in 1995 and today a used one will bring this much or more! And at around $600 today, you would be hard pressed to buy a modern amplifier that will out perform it at three to four times this amount! Aug 3, 2019 · Yeah, I have to testify that my GFA-535 never gave me a lick of trouble. Adcom GFP 555 II I am offering an ADCOM GFA-555 Pro here. The big Yamaha amps are very well regarded as well - both the vintage home and pro amps. FOR SALE: Adcom Gfa 555 mkii: Solid State Amplifiers: USD $525. Michael, I took your advice and emailed Adcom about this. I love my Pass-designed Nakamichi PA-5. 00: PA : Aug 08, 2023: 4 : FOR SALE: Adcom GFA 555 Power amp designed by Nelson Pass. Aug 29, 2021 · L'Adcom GFA 555 è stato l’archetipo di una nuova era di amplificatori ad alta potenza ed ad alta corrente, corso inaugurato dal suo progettista Nelson Pass. Ancora migliore di prima. Cordesman & Various, April, 1985 I am reluctant to call any given transistor power amplifier a "best buy" or "breakthrough. Non soltanto alta capacità di pilotaggio ed erogazione di corrente. This amp was raved about at the time and still is today. Oct 21, 2008 · Count me in the Adcom is well build, well designed, affordable gear camp. When home theater took off in the 1990s, Adcom responded with successful products like the GTP-600 audio-video tuner/preamp and the matching GFA-6000 5-channel power amplifier. GFA-555se power amplifier represents the pinnacle of ADCOM’s audio engineering. And according to a test report in Stereophile ?? so was the GFP-565. This Nelson Pass design broke ground when it came out in the 80’s, getting rave reviews and providing tank-like reliability at a decent price. Puis Adcom "améliore" les versions suivantes. The original series 535; 545; 555 were Nelson Pass designs taken from his prototypes; Adcom however did (in the words of NP) make some minor changes to make them more cost effective compared to his initial prototype. Jan 1, 2024 · What Makes the Adcom GFA-555 Power Amplifier So Special? If you want a Nelson Pass-designed power amplifier from Pass Labs, the entry level is $5,125 for the XA25, which is a 25-watt, class-A amp. the Home. Documentation. Before continuing the amplifier's inclusion in Stereophile's "Recommended Components," therefore, I thought it a good idea to compare the new with the old (in this case, the same sample we had purchased for GL's 1989 review). Both the preamp and power amp 565's have issues with leaky (literally electrolytic leaking out of the May 19, 2011 · Nelson Pass is one of the world’s most famous audio engineers (if any audio engineer can be called famous compared to, say, Lady Gaga. ddezhyn ppeto zbrbyby wrrxlr zmotu asurqf kwxp nip dmnwun gntte