Adcom Model GFP-565 High Performance Stereo Preamplifier w/BOX-NICE. I had my local electronics shop test everything and clean the pots. Good to go!

This is a reprint of the StereoPhile Review done in 1990. It has 7 pages of information, tests, graphs and pictures. The GFA-565 MONO Amp and the GFP-565 Preamp, some of Adcoms best equipment EVER! Here you have the THOROUGH folks at Stereophile taking both through its paces with a full test of each and comments about both. You will be amazed at what they get the amplifier to put out under test conditions! The picture is exactly what you will receive, 7 pages of RARE information. You will love it if you have this AMplifier or Preamp! -This is a an exact re-print of a classic Audio Advertisement. -Each page is 8.5 by 11 -Shipping is $3 in the USA and $6 ANYWHERE else, I ship WORLDWIDE! Each additional item is only $1 more to ship! -As always, your satisfaction is GUARANTEED at Electronics Archives! If you are unhappy with any purchase, email and I will get you a resolution or a refund! -Email me with any questions, I put 10-20 new Ads and Brochures on my site EVERY DAY! THANK YOU! Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items.

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.

Adcom is in very good cosmetic condition, with minor to none scratches see pictures. It has been tested and is in working conditions. Let me know if have further questions. We ship internationally!

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.

Beautiful condition, nice and super clean, from my vintage audio collection, sounds great.

ADCOM top of the line products, as the GFP 565 is , were designed to compete favorably with High End audio manufacturers costing many times more. ADCOM was considered by many to be entry level high end. High end can get Very expensive. Preamps can get in the $3,000 to $10,000 price range. The 565 came on the market at $799.00 in black. The white version was $50.00 extra on special order. For sale is the WHITE. The strengths of the 565 in my opinion are: Extremely quite phono section. Extremely quite overall performance. Flexibility on connecting to amplifiers. I used the bypass option which bypasses all tone controls and direct couples the preamp to your amp giving you the purist path to your amp. Many source components can be connected to the 565. Here are some specs: Solid-state stereo preamplifier. Output impedance (bypass, normal, and lab outputs): 100 ohms; Output level: 2.0V (rated), 10.0V (max); THD plus noise: 0.0025% (high-level), 0.009% (phono). IM distortion (SMPTE): 0.0025% (high-level), 0.0025% (phono). Frequency response (±0.5dB): 5Hz–90kHz (high-level), 5Hz–70kHz (phono). RIAA accuracy: 20Hz–20kHz ±0.1dB. Weighted S/N ratio: >100dB (high-level), >95dB (phono). Power consumption (120V AC/50–60Hz): 10W.Dimensions: 17 W by 12 9/16 D by 3¼ H. Weight: 11 lbs.

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

This ADCOM power amplifier, model GFP-565, is the perfect addition to any home audio system. With its high-quality sound and reliable performance, it's sure to impress any audiophile. The brand ADCOM is known for their top-of-the-line audio equipment, and this preamplifier is no exception. Designed for use with consumer electronics and TV, video, and home audio systems, this preamplifier is versatile and easy to use. Its compact size and sleek design make it a great choice for any home entertainment setup. Whether you're a music lover or a movie buff, this ADCOM preamplifier is sure to enhance your viewing experience.

Adcom Model GFP-565 High Performance Stereo Preamplifier w/BOX-NICE. Free returns offered!

This his from my person collection, it’s mint and works perfectly. I am OCD with my equipment, this was service and clean inspected, and is a perfect example of of vintage GFP565. This Adcom GFP-565 vintage preamplifier is a top-quality unit with outstanding analog features that is sure to enhance your audio experience. The preamp includes 4 inputs, including AUX, Phono/Turntable, Stereo L/R RCA, and Pre Out, allowing you to connect multiple audio sources. Additionally, the preamp has 2 outputs, Stereo L/R RCA, and 2 channels, making it a perfect fit for your home audio system. The preamp has a sleek black design and is in mint condition, having been tested and serviced. The Adcom GFP-565 is a unit type and was manufactured in the United States, making it a high-quality and durable piece of equipment. Get this preamp and add an extra layer of depth and clarity to your audio experience.

This ADCOM Preamplifier Model GFP-565 is a reliable and high-quality audio device that has been tested for its performance. It is a perfect addition to your home audio system and can provide you with a great listening experience. The brand ADCOM is known for its durable and long-lasting products, and this preamplifier is no exception. Overall, the unit is in good condition, with the exception of one scratch on top. With its easy-to-use controls and efficient performance, this preamp is ideal for both music enthusiasts and professionals alike. It has been designed to provide you with the best possible sound quality, and it succeeds in doing so with ease. Whether youre watching your favorite movie or listening to your favorite music, this preamp is sure to impress.

Tested and in nice working condition. There is a small dent on top rear left corner, I presume from the foot of a component stacked on top. I do offer free local pickup in Orange County CA! I will also be selling an Adcom GFA-545 2 amp in another listing.

Adcom Model GFP-565 Solid State High Performance Stereo Preamplifier with ORIGINAL BOX AND MANUAL TESTED AND WORKS BEAUTIFULLY Beautiful high-quality amp and comes with all the original manual and box with the original Styrofoam and plastic to keep it extra safe and storage or shipping whatever you need to do when not using it. Will be shipped out fast and safe in 24 hours or less and extremely well protected when shipped.

This was currently installed and working sold as is no returns no shipping outside the US thanks