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Nelion Audio

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Nelion Audio last won the day on February 19

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  1. Hello, Yes of course we are still doing these mods. We always calibrate the meters when serviced.
  2. I'm sorry, I don't offer to replace the RCA jacks on a C-4000 or 4000t.
  3. The Carver C-19 is a unique design, both in terms of its features and its circuitry. It's most notable feature is its vacuum tube output stage. In every respect, it is a solid state pre-amp, however, both the Main Output and Phono Amp stage utilize vacuum tube 'buffers' that create that coveted organic feel in the music signal. This preamp is considered a flagship of the Carver era, and there's many reasons to accept this status. Close attention to detail and the preservation of the fidelity of the source material is what this preamp is all about. The signal stages are meticulously designed to preserve the music signal and reject all other forms of interference and coloration. The gain stages are capacitive coupled, but to avoid any non-linearities, the coupling is also compensated with differential filters and bypass circuits. The result is a preamp with many options, such as Spectral Tilt, adjustable Gain, 2 processor loops, and Left and Right tone controls, without compromising its design goal, which is a faithful but musical preamp for vintage and modern media. The preamp runs hot, so 30 or so years after operation, it needs a lot of attention. The unit has many electrolytic capacitors that need to be replaced, and much of the solder joints are stressed and need to be reflowed. The Main Power Supply regulator circuits also need to be updated and usually, completely reflowed. The circuit boards are double layered, and very thick, so while the solder and board itself are typically in decent shape, the traces and contacts start to fail after time. The unit is difficult to rework because of the double layers and tremendously thick cladded vias. DIY projects and repairs often end in tears - this unit is not recommended for beginners! All consumable parts are replaced, solder joints reflowed where needed, dials and knobs are reconditioned, unit is cleaned inside and out. All functions tested and verified. Any needed repairs or mods are included in the restore cost except cruel and unusual damage, such as missing or broken RCA connectors or excessive corrosion. New RCA jacks shown at the Main Output 1 and 2: Inside after restore (the silicone rings on the vacuum tubes are not typical, client provided) Restore Cost: $550 New RCA Jacks (per pair): $50 New Tubes: *Quote Only Comes with Nelion Audio 3 year parts and labor warranty.
  4. We use OPA2134. However the pinouts are quite different, so you have to use an adaptor.
  5. The A Series Carver Amplifiers were late in Carver's Production years. Although not Magnetic Field Coil amplifiers, they still inherited many of Bob's amplifier topologies that create an accurate, musical and powerful sound reproduction. Although the extent to which Bob was involved in the A series design is not known, it is unmistakably an extension of his earlier designs. The A-series amps utilize voltage rail switching to produce immense dynamic power without having to add cumbersome heat sinks. The high voltage rails are engaged by Power MOSFETS which modulate to the output signal and turn on only when the music amplitude demands, feeding the output sections that are direct coupled with multiple paralleled transistors for high current output. Featuring bridge-tied mode, gain adjustments for each channel, VU meters and 5 way binding posts, the A series power amplifiers are remarkably suitable for almost any musical set up. Our restoration addresses minor failure points, replaces all consumable parts*, calibrates the signal transfer function, and a full cleaning inside and out. We also offer an IEC socket modification, Gold RCA posts, Gold 5-way speaker binding posts, and meter light LEDs for an additional fee. Before restoration: After Restoration: Added speaker binding posts. Price: $350 + shipping (A-753x $400 + shipping) Gold RCA jacks: $50 (A-753x $75) LED meter lights (color of your choice): $60 (A-753x $65) Gold 5-way binding posts: $55 (A-753x $75) IEC socket: $50 Nelion Audio 3 year parts and labor warranty included. *We do not replace the main power supply capacitors unless necessary. At the time of this writing, they are still within the life expectancy. If we must, we will quote. Contact Service
  6. The Carver C-4000 and 4000t are similar but also very different. However, restoring them and upgrading them are similar enough to include together. These preamps require a complete overhaul after nearly 40 years of use. We replace all the electrolytic capacitors with either high temp, long life type, bi-polar or low ESR where appropriate. We tear the unit down completely and recondition all the wipers on the attenuation knobs and buttons. Some units require factory updates and power supply fixes. All of these units also require the phono amps, time delay, auto correlator and sonic holography circuits to be tuned and calibrated. The unit is also cleaned and polished, fully tested and we listen to it to ensure it sounds better than ever. The results of our work are stunning! Gundry Filter Circuit for C-4000/400t Sonic Holography Frequency Response (stock): Sonic Holography Frequency Response With Gundry: Note the two 'dips'. This enhanced equalization expands the holographic imaging of the SH processing to our natural, non-linear perception of sound location. It's function is to attenuate frequencies which our ears are naturally very sensitive too, such as baby crying and sirens. By adjusting the frequency response of some audio processing, such as Sonic Holography, the result is a better sound image, especially at high volume levels where certain mid-range frequencies dominate our ear/brain system and smear our perception of depth and detail in the music. Signal Path Upgrade The line out amp stage and tone circuits are pretty simple and elegant for these preamps. But if you want even tighter response and lower noise, go for this upgrade to make the unit even more blissful to the ears. We will install high grade op-amps in place of the stock RC4136 chips, 1% metal film resistors and Polypropylene Capacitors in critical areas of the Line Out amp and Tone Control in addition to the already impressive components used for the Base Restore. High quality parts and expert workmanship. Gundry Filter board installed on the Sonic Holography PCB. New LEDs for the faceplate. Restore Price: $450 Gundry Filter for Sonic Holography: $60 Signal Path Upgrade: $100 LED color change: $50 Remote control Volume: $175 IEC socket: $50 Comes with Nelion Audio 3 year parts and labor warranty. Contact Service
  7. Restoral of this little gem involves replacing all electrolytic capacitors, reconditioning of the output transistor thermal isolators, replacement of critical resistors and pre-drive transistors, service bulletins and full cleaning inside and out. Full restore price: $400 Binding Post Upgrade: $50 LED color change: $50 Comes with Nelion Audio 3 year parts and labor warranty.
  8. We service a wide variety of audio amplifiers; including Phase Linear, Sunfire, Carver Tube Amps, Adcom, Hafler, McIntosh, Pioneer, Yamaha, Krell, and more! Service Base fee: $150 The base fee covers basic repairs to a component to restore its operation. The fee covers up to $20 in parts. If more work is needed, or if expensive parts are required, a quote is submitted for approval before work is done. If the component cannot be reasonably repaired within an hour or two, a quote is submitted right away. If the quote is refused and work was not performed, the fee drops to $50. If the repairs cannot be performed due to lack of information or resources, the fee drops to $50. Most repairs do not exceed $300. If you need a custom shipper, please let us know. We can make a custom box for most models and send it for a small fee. Don't get frustrated over shipping - we will take care of you! Contact Service
  9. We are so happy you have come to visit! Please view the announcement above for contact information and for services.
  10. This service is a full restoration and possible upgrade which includes cleaning inside and out, replacement of all consumable parts, reflow of questionable solder, service bulletins, new LEDs (your choice of color) for the meters, new 5-way binding posts, high-quality output relay, and the mkII upgraded components. The mkII upgrade gives your 500(t) a much higher power rating, more headroom, less commutation distortion, better current sourcing and performance into low impedance loads, and tighter bass and transient control. We are the only techs authorized to perform this mod. Any other 'pros' out there claiming they can do this upgrade have copied information available on our websites and perform these upgrades without our permission. Our prices are well worth every penny. We stand behind our work 100%. If we can impress Bob Carver himself with our work, you can't be disappointed! FAQ: Are repairs covered under the restore? Yes. When we say restore, we mean it. It's not a gimmick. We really do tear down and replace all components known to go bad over time. Only extraordinary things like human meddling, corrosion, cracks, etc might not be covered, but only if these problems impede the operation of the unit. We have to cover a 3 year warranty, so we will make sure the unit is as flawless as possible. How they look when we get them: How they look when we're done: Features of Restore: - Long life high temp capacitors throughout - High performance audio grade capacitors in signal paths - Replace all power rectifiers - Replace output protection relay - Replace meter bulbs with LEDs of your color choice - Perform factory service bulletins where needed - Calibrate, burn-in and test to specs. I also listen to all the amps I work on. It doesn't leave my bench unless is sounds like it should. mkII features: - Replace voltage trim pots - Replace and upgrade power switching diodes - Replace high power switching transistors and drivers in power supply - Replace entire pre-drive stage transistors to higher voltage, higher power type - Replace input opamp buffer to audio grade device - Completely upgrade and rebuild output stage transistors for more linearity, durability and higher power handling - Upgrade speaker binding posts to modern 5-way gold or silver - m500 models are upgraded with the 't' mod, as recommended by the factory. Comes with a 3-year parts and labor warranty. Specs: Power into 8 ohms: Stock: 251 watts MKII: 395 watts Clipping into 8 ohms: Stock: 270 watts MKII: 410 watts Dynamic into 8 ohms: Stock: 380 MKII: 520 watts Signal Path Upgrade: High grade polypropylene capacitors are installed in critical areas to maintain proper signal conditions while under heavy loads or heat stress. While the amplifier is extremely resistant to trouble caused by noisy or heat stress conditions, this upgrade will take it a step further to increase the amp's performance in demanding circumstances. LED options: Warm White: Blue: Amber: Cool White: Green: All new power output transistors for high linearity and power handling: Binding Posts (gold shown) and optional IEC socket Although the Dim Switch will still dim the LEDs, The LED driver can be trimmed to your brightness preferences (Driver model 002 shown): Base Restore Cost: $380 + shipping mkII upgrade add: $150 (includes Gold speaker binding posts and LEDs of your choice) Extras: IEC socket: $50 Signal Path upgrade: $65 Gold RCA jacks: $50 M500 power switch (added to back of unit): $50 12V input on/off trigger: $50 Install 't' Mod on M-500 model: $20
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