Title: ADCOM GFP-565 2 Channel Pre-Amp/Processor Amplifier -Tested Item Attributes Brand: ADCOM Type: Power Amplifier Number of Channels: 2 Model: GFP-565 Function Tested: Powers on - Tested Complete: As shown CONDITION:Used This item is used-may have marks, spots or other imperfections Dust or dirt from storage and use. ***Condition Disclaimer*** This is a USED item donated to Goodwill of Orange County. Please see images for further detail and ask any questions you may have before making a bid. Note: Any testing of electronics for power and/or functionality will be mentioned within the listing above ONLY if applicable. In some instances we may not have the necessary equipment to test certain electronics therefore these will be auctioned off AS-IS with no refunds. WEIGHT & DIMENSIONS: Weight:10.60 Shipping Weight:11.00 Dimensions:17.00 x 15.00 x 4.00

Part of a complete Adcom system being sold separately. This auction is for the preamplifier only. It is in overall nice condition, does show some scratches and a few nicks. Nothing serious. Fairly priced. PLEASE LOOK AT ALL OF THE PICTURES PROVIDED AND ASK FOR MORE IF NEEDED. PLEASE ASK ALL QUESTIONS YOU MAY HAVE. THE MAJORITY OF MY ITEMS ARE SOLD AS IS DUE TO THEIR NATURE AND RARITY. SOLD AS IS. NO RETURNS. NO REFUNDS. Shipping quote is only for the Continental U.S.A. Shipped with UPS or FedEx. USPS for Media, and smaller light stuff. Feedback will be given, when feedback is received.

This is a hard to find Adcom GFP-555 pre-amplifier. Item is in good working condition. Buyer pays $55 for shipping to Canada and USA except Hawaii or Alaska.

This Adcom GFP 715 preamplifier is a high-quality device that offers 2 channels, 4 audio inputs, and 1 phono input. It is a great addition to any home audio setup and is perfect for those who want a reliable and efficient preamp. The brand, Adcom, is known for producing top-quality audio equipment, and this model is no exception. With its easy-to-use controls and high-quality sound, this preamplifier is sure to impress any audiophile. It is ideal for use in a variety of settings, including home audio, TV, video, and consumer electronics. Whether youre looking to upgrade your existing setup or youre just starting out, the Adcom GFP 715 preamplifier is a great choice. Two Channel Full Function PreampClass A line level preampHigh-resolution audio bandwidth4 audio inputs1 phono input stageTape output w/monitor functionExternal processor loopBass,treble,and balance adjustFront panel headphone input

This is a hard to find Adcom GFP-555 pre-amplifier. Item is in good working condition. Buyer pays $55 for shipping to Canada and USA except Hawaii or Alaska.

ADCOM GFP-555 Stereo Preamplifier w/ Musical Concepts 120 AC Power OPS UNTESTED Selling as us! No Returns!

Excellent condition, tested and working. Like the GTP-400 tuner/preamp, the GFP-565 combines the design talents of Walt Jung and Adcom's product-development director C. Victor Campos. The 565's main amplification circuitry and power supplies were designed by Walt, while component selection was a collaborative effort. Walt's contributions involve far more than the fine-tuning of existing circuitry, since the phono preamp and line-level stages employ unique circuit topologies which he developed. Walt's reputation as the foremost authority on the use of IC op-amps in high-performance audio circuitry is further reinforced by the GFP-565 preamp, in my opinion. Victor Campos brought his rare talents for realizing a first-class design through the final stages of production without compromising the performance along the way. In fact, the production version of the GFP-565 is, if anything, slightly better than the pre-production prototype I first evaluated. As has been the case with other Adcom products, the 565 is completely American in design, and although the main printed circuit board is manufactured in the Far East, final component assembly and testing are done right in East Brunswick, NJ. The GFP-565 was designed to satisfy purists, who normally demand as simple a signal path as possible, as well as those audiophiles in need of a full-featured preamp. These two seemingly contradictory requirements were addressed by supplying the 565 with three sets of outputs. The bypass outputs are intended for the purists (among whom I include myself). No tone controls or filters corrupt the signal path when the bypass outputs are used, but the balance control is still operational. The bypass outputs are also direct-coupled, eliminating any possibility of sonic degradation normally associated with coupling capacitors. The bypass outputs still allow the use of an external processing loop, so they are not absolutely purist in the sense of minimizing every possible switch contact. A mono switch and loudness contour are also available when the bypass outputs are used, but the contour switch and its associated filter components are connected to a tap on the volume control, so these components and switch contacts are not in the signal path. Like the GTP-400, the loudness contour's characteristics are based on the studies of Robinson and Dadson. The contour characteristics are gradually reduced as the volume control is advanced, but the circuit should be switched out when listening at normal volume levels. Similarly, the mono switch does not actually place contacts in the signal path; it simply connects the left and right channels together. A few purchasers may wish Adcom had included separate left/right mono switching, helpful for playback of the double-duration mono CDs from Rodolphe Productions. However, if you purchase the 1953 Clemens Krauss performance of Wagner's Ring (footnote 1), which you should if you love this music, you'll receive a free L/R mono switchbox. Although the switchbox is a cheap, flimsy affair that you'd never want to leave in your signal path, the box could easily be connected to the 565's external processing loop, to be switched in only when necessary. Plans for constructing such a switch have also appeared in Audio Amateur (footnote 2). For those in need of the tone controls, two additional outputs providing those features are included. The normal output is capacitor-coupled with a high-quality film device, whereas the lab output is direct-coupled. The tone controls provide boost or cut below 300Hz and above 3kHz, with a minor side effect on information between those two frequencies. A high-cut filter is also provided via the main and lab outputs. The filter characteristic is very gentle, being only 2.7dB down at 20kHz. This might be just enough high-frequency cut to remove some of the edge from a cheap CD player, but I would hope that anyone purchasing the GFP-565 would be using sources worthy of its own performance. Six inputs are provided on the GFP-565, including phono, CD, tuner, tape 1 and 2, and video/aux. Separate selector switches are provided for listening and recording, and since two tape outputs are also included, tape copying in either direction is possible. The 565 does not have an infrasonic filter for the phono preamp. I asked Victor Campos why he had dispensed with this feature when it had been included on previous preamps, including the GTP-400 and the GFP-555. Victor said that he believed that any infrasonic filter compromised the sound quality of the phono preamp. The GTP-400 and GFP-555 contained the filter because of the fact that these less expensive preamps would probably be used with cheaper turntables which generate more infrasonic noise. The 565 will probably be used with more expensive turntables which do not suffer from this problem. Of course, this still does not address the record-warp issue, but the GFP-565 does not become unstable when fed a large amount of infrasonic information from a warped LP. When I compared the 565 to the Audio Research SP-11 II (more on this later), I found that warped LPs played through the SP-11 II caused visibly greater infrasonic movement of my woofers than the same discs played through the 565 at the same playback level. The SP-11 II contains a switchable infrasonic filter. The circuitry in the GFP-565 is based on IC op-amps, but their implementation is rather sophisticated. The ICs used in the 565 are specially selected devices bearing Adcom's own part numbers. Both the phono preamp and the line-level stage employ high-current, low-output-impedance IC buffers within the feedback loop. These IC buffers are not op-amps, instead being unity-gain devices designed to work with an op-amp to form a complete gain stage. The op-amp's output feeds the input of the high-current buffer, which in turn drives the feedback loop and the next stage of amplification. This configuration allows the op-amp to provide the necessary gain without being affected by the loading of the next stage. The IC buffers are externally biased for pure class-A operation, and each device is mounted on a small aluminum heatsink. The implementation of the buffers in the phono preamp is rather unusual. The gain of the phono preamps is accomplished with an ultra-low-noise IC op-amp. A low-noise op-amp will not, however, produce a silent phono preamp unless the RIAA equalization network has very low impedance at high frequencies. In any feedback-based RIAA preamp, the noise level will ultimately be limited by the impedance of the RIAA feedback network. Adcom uses an RIAA network with an impedance of approximately 250 ohms at high frequencies, whereas most other IC-based phono preamps have an impedance of 1k or higher, which in turn results in a higher noise level. So why do other manufacturers use a high-impedance feedback loop when they could optimize the noise performance by lowering the impedance? Very simple. Few, if any, IC op-amps can supply enough current to drive a low-impedance RIAA network while still maintaining low distortion. Adcom's high-current IC buffer makes the use of a low-impedance RIAA feedback network possible. The op-amp provides the necessary voltage gain, with its output feeding the input of the buffer. The buffer, in turn, drives the RIAA network, with plenty of current to spare. The result of all this is the quietest phono preamp I have ever encountered. The low output impedance of the IC buffers in both the line-level and phono stages also improves dynamics by an order of magnitude over what the op-amps could achieve by themselves. The output stages of the IC op-amps are also operated in class-A, not with the common pull-down resistor technique, but using a more sophisticated current-source arrangement. All integrated circuits are soldered to the PC board, eliminating contacts in the signal and power-supply lines which result when IC sockets are used. The phono input is a fixed-gain circuit designed for use with cartridges whose outputs are 2mV or higher. The designers deliberately avoided making an all-purpose phono preamp with switchable gain for low-output moving-coil cartridges. I can't argue with this approach. A phono preamp circuit should really be designed for a single gain setting; doing otherwise will invariably result in compromised performance. You can't optimize a phono preamp for high-output cartridges, throw in a switch and resistor, and expect the preamp to perform equally well with low-output cartridges. An optimum preamp for low-output cartridges requires a circuit topology tailored for that purpose.

ADCOM GFP-555 Stereo Preamplifier w/ Musical Concepts 120 AC Power OPS UNTESTED Selling as us! No Returns!

Great tested pair of ADCOM audio equipment. Free pickup in OC CA.

In very good condition. Unit powers on and orange indicator light comes on. Have not been able to connect to a sound system for testing/playback. For this reason it is listed as parts only, no returns.

A Very Nice Condition Adcom GFP-710 Pre-Amplifier. The 710 is the evolution of the GFA-565 with better components and a better phono section. They are remote controlled and it includes the original remote too! Serviced by the Original Adcom service center and fully tested. Its a beauty!

After a long consideration and some sadness, I am selling my Adcom Flagship Stereo components. I am the original owner and they were all bought at the same time in late 1998. They have been rack-mounted in a smoke-free home with Adcoms optional rack mount ears every since. In fact, I had our builder install the space for the rack mount with plenty of ventilation behind and access via closet door. And, as you can see in the photo, there has been a rack fan on a thermostat and it turns on anytime the surface of the amplifier hits 95 degrees F. The components are in very good shape cosmetically, and excellent shape functionally. In fact, the amplifier was cleaned, inspected, and bench tested just a week or so ago at one of our VERY reputable vintage audio gear tech shop. You can read the receipt / report in the photos and here is a transcript of the voice message Joseph (technician) left on my phone: Hello Michael, its ____ from Magnetic Tape. Im happy to report that the Adcom power amplifier checks out perfectly fine on the bench. Everything seems to be OK. The Bias and D/C offset are perfect and did not require any adjustment. It produces 256 watts per channel at the rate of distortion level on our analyzer, so everything seems to be AOK. Power supply is regulated properly. I see no leakage on the main filter capacitors. We we think youre going to be good to go . . . no reason to change anything out on it. Both channels are running even and balanced after a couple of hours. Theres no drift. The heat is even. We cant find any bad solder connections visually. We see no bulging or leaking caps. . . In addition, about every year or so, I completely removed each component, removed the top, and blew out any dust, and used de-oxit sparingly to clean with a cotton swab connection points. On the preamp, I also would put a drop of two of de-oxit into the volume and balance pots to keep those squeaky clean. All of it still works perfectly and sounds fantastic. FOR 10 days Im going to put it all up for auction as a set to give someone who wants a complete solution a change to buy it as a package. After that Ill list components separately with accompanying photos. But I didnt pull it out of the rack yet because I know the condition and they area all in very excellent condition with maybe a few scuffs from putting in and removing, but nothing major. WHY AM I SELLING IT ALL? Because a couple years ago my dad left me a little inheritance money when he passed away and he get me into my love of music and great audio gear and I have an opportunity to buy a couple McIntosh components for a possible upgrade over this fine Adcom gear. Each has original boxes, manuals, remotes, and power cords. Ill also send the various press clippings from various publications lauding how great this equipment was. The amp and preamp were said to be desinged by the great Nelson Pass. Good luck bidding. Domestic shipping only and buyer pays shipping. NOTE: THE ONLY THING IN THIS LISTING THAT IS UP FOR SALE / BID is the Adcom GFP-750, Adcom GFA-5802, and Adcom GCD-750 - circled in the photo.

ADCOM GFP 565 Brand: ADCOM Model: GFP 565 Functionality: Condition: Good - shows some sign of wear Check out our other items! Be sure to add NCJW/LA to your favorites list! so you do not miss any listings!We want this to be a pleasant buying experience. If you are not happy with your purchase, please contact us.

ADCOM GFP 565 Brand: ADCOM Model: GFP 565 Functionality: Condition: Good - shows some sign of wear Check out our other items! Be sure to add NCJW/LA to your favorites list! so you do not miss any listings!We want this to be a pleasant buying experience. If you are not happy with your purchase, please contact us.

Item is not tested. We dont have a way to test the unit. No accessories included. All the items included are what you see in the pictures. Item is sold AS IS for parts or repair. No returns accepted.

A Very Nice Condition Adcom GFP-710 Pre-Amplifier. The 710 is the evolution of the GFA-565 with better components and a better phono section. They are remote controlled and it includes the original remote too! Serviced byt the Original Adcom service center and fully tested. Its a beauty!

Selling these items in good working condition please check pictures for condition DOES NOT COME WITH ANY OF THE WIRES OR CONNECTIONS.SPEAKER IS NOT INCLUDED AS WELL. Any questions feel free to ask. Thanks for looking

Works great. Looks great. Tested.