Fully Serviced
All items are meticulously serviced and restored to meet factory specifications
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Adcom
The Adcom GTP-550 is designed with two Dolby Pro Logic modes: Dolby Pro Logic and Cinema.
In the Cinema implementation of Dolby Pro Logic, the front channels are equalized and diminishing multiple delays are added to the rear channels. This more closely approximates the sound of a large theatre.
In the Dolby Pro Logic mode, the GTP-550 presents a spatially correct soundstage with precise lateral imaging and front to back depth. This is the second of two preferred modes to properly process Dolby Surround encoded video soundtracks, a growing number of CDs and even the audio portion of some computer games.
The GTP-550 also includes three Digital Signal Processing modes. These delay modes create psycho acoustically correct environments, from an intimate nightclub to an outdoor stadium, all at the touch of a button. This wide array of delay mode options gives you the power to create custom sound-fields for your favourite videos or music events.
The Stadium mode is used for non-Dolby Surround encoded material to recreate a large and acoustically reverberant environment well suited for video sporting events and play back of music events performed in large outdoor arenas. A slight upper midrange frequency emphasis is added to the front channels to enhance intelligibility. Stadium mode is also well suited for playback of older epic movies.
The Concert Hall mode replicates a relatively large indoor performance space. Front channel frequency response is flat for maximum musical clarity while the diminishing multiple rear channel delays first seen in Cinema mode enhance the sense of spaciousness.
In Nightclub mode the GTP-550 synthesizes a smaller and more intimate sound-field ideal for many types of jazz and popular music. Nightclub mode is also a good choice for playback of classic movies with mono soundtracks.
The Five Channel Stereo mode makes full use of a home theatre system's speaker complement and is intended primarily to reproduce large scale musical events such as a full orchestra concert or an opera. In addition, the GTP-550 also includes a two-channel stereo mode for true stereo sound.
When it comes to FM broadcasts the GTP-550's highly sensitive tuner section delivers the clearest sound the transmitted signal allows. All tuner circuitry is isolated on its own low-loss, epoxy board and constructed with specially crafted RF, IF and multiplex decoding circuits for minimal interference and optimal clarity.
The GTP-550 combines the extensive switching and signal processing capabilities with a rare degree of operational simplicity. Straight-forward design and logical control groupings replace the usual intimidating front panels with often inaccessible and confusing multi-function controls.
All these features are easily operated by the GTP-550's infrared remote for total control from anywhere in the room. And the GTP-550 is fitted with high quality input and output connections for four audio and four video sources. This configuration ensures complete compatibility and flexibility for all your home entertainment needs for years to come.
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.005%
Signal to noise ratio: 100dB (line)
Output: 2V (Pre out)
Digital inputs: optical, coaxial
Dimensions: 108 x 432 x 324mm
Weight: 7.7kg
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There’s something undeniably magnetic about vintage audio gear. The tactile weight of milled aluminum knobs, the warm glow of dial lamps, and—above all—the rich, analog sound that today’s sterile streaming boxes can’t quite replicate. But time is merciless: capacitors dry out, switches oxidize, and those gorgeous walnut cabinets lose their sheen. That’s where the art (and science) of our vintage audio refurbishment comes in.
Why Vintage Audio Still Matters
In the golden era of hi-fi—roughly the mid-1960s through the early 1980s—companies like Marantz, McIntosh, Pioneer, Sansui, and Technics were engaged in an arms race of build quality. This was before cost-cutting plastics and disposable designs; amplifiers were over-engineered, receivers were works of art, and turntables were precision instruments.
Owning one wasn’t just about sound; it was about status and permanence. These machines were built to last a lifetime—or two. The irony? Decades later, they often do, provided they’re given the care they deserve.
The Philosophy of Refurbishment
Refurbishment is not just about fixing; it’s about preserving authenticity while ensuring reliability. The goal is to keep that lush, analog character alive without compromising safety or sound quality.
Some enthusiasts chase museum-level originality—keeping every factory component in place. Others opt for sympathetic modernization, upgrading parts that never existed in the ’70s to improve performance. Both approaches can be valid; it depends on your vision.
The Turntable Store refurbishing process.. step by step
Step 1: The Initial Encounter
When we first meet a 40-year-old amplifier, we resist the urge to plug it in right away. That dusty Marantz 2270 might look gorgeous, but old electrolytics and brittle insulation can short instantly under full voltage.
Instead:
Tip: A faint musty smell? That’s often the scent of old phenolic boards, not trouble. But a burnt smell? That’s trouble.
Step 2: Deep Cleaning & Control Detox
Dust is the enemy of good sound, that is why we clean the interior carefully with compressed air and a soft brush.
The real magic comes with switches and potentiometers. Over decades, oxidation builds up, causing scratchy controls and dropouts. A deep contact clean in each pot and switch, followed by vigorous cycling, often restores silky-smooth operation.
Step 3: Electrical Resurrection
This is where science meets art:
Step 4: Cosmetic Glory
Refinishing the walnut cabinet can transform a unit. We do use real wood oil or Danish oil, not polyurethane. We clean the glass dial carefully; those silkscreened letters are fragile.
Knobs? We polish with metal cleaner, but never use abrasives on anodized aluminum.
Faceplate lettering? We avoid harsh chemicals—just mild soap and a microfiber cloth.
Step 5: Calibration & Sonic Check
After the repair and cleaning, it’s time to dial in the performance:
When done right, the result is astonishing: a sound that breathes—liquid mids, velvet highs, and bass with a tactile presence that modern gear rarely matches.
Our promise for Audiophile-Level Results
Why It’s Worth It
The payoff isn’t just sonic—it’s emotional. Restoring a 1970s Marantz or Sansui is like bringing a classic car back to life. Every glowing dial lamp, every smooth rotation of a volume knob, connects you to an era when music mattered enough to build machines like this.
And when you drop the needle on your favorite record and hear that warm, enveloping sound, you’ll know: this wasn’t just a repair. It was a resurrection.
We have a 14-day return policy, which means you have 14 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at theturntablestore@gmail.com. Please note that returns will need to be sent to the following address:
The Turntable Store
45 Market Square
Manheim PA 17545
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at theturntablestore@gmail.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, like turntable needles and custom products (such as special orders or personalized items). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at theturntablestore@gmail.com.
We ensure our customers have the best shopping experience
All items are meticulously serviced and restored to meet factory specifications
We pack with precision and ship in brand new, appropriately sized, boxes.
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