Like New, Under 10 hrs. Sleeker looking than ever before, solid build qualitySmall footprint and is lightweight enough to be used in any setupVery powerful for its size, fully drove a wall of headphonesTraded linearity with a much better tonal balanceRicher, warmer and fuller sounding than any other Topping-made amplifierSuper-extended at both ends of the spectrumBetter dynamics with harder-to-drive headphones, there’s finally a fun factor on a Topping-made amplifierAn improved transient response, especially when landing sub-bass notesLacks any kind of noise or distortion even at max power, an IEM-friendly amp for sureCrazy levels of transparency and detail-retrievalSlightly wider and deeper sounding compared to their past doings could challenge even bigger and pricier ampsOffers precise imaging and an outstanding layeringLacks glare and listening fatigueAn outstanding value!

Like New, Under 10 hrs. Sleeker looking than ever before, solid build qualitySmall footprint and is lightweight enough to be used in any setupVery powerful for its size, fully drove a wall of headphonesTraded linearity with a much better tonal balanceRicher, warmer and fuller sounding than any other Topping-made amplifierSuper-extended at both ends of the spectrumBetter dynamics with harder-to-drive headphones, there’s finally a fun factor on a Topping-made amplifierAn improved transient response, especially when landing sub-bass notesLacks any kind of noise or distortion even at max power, an IEM-friendly amp for sureCrazy levels of transparency and detail-retrievalSlightly wider and deeper sounding compared to their past doings could challenge even bigger and pricier ampsOffers precise imaging and an outstanding layeringLacks glare and listening fatigueAn outstanding value!

Like New, Under 10 hrs. Sleeker looking than ever before, solid build qualitySmall footprint and is lightweight enough to be used in any setupVery powerful for its size, fully drove a wall of headphonesTraded linearity with a much better tonal balanceRicher, warmer and fuller sounding than any other Topping-made amplifierSuper-extended at both ends of the spectrumBetter dynamics with harder-to-drive headphones, there’s finally a fun factor on a Topping-made amplifierAn improved transient response, especially when landing sub-bass notesLacks any kind of noise or distortion even at max power, an IEM-friendly amp for sureCrazy levels of transparency and detail-retrievalSlightly wider and deeper sounding compared to their past doings could challenge even bigger and pricier ampsOffers precise imaging and an outstanding layeringLacks glare and listening fatigueAn outstanding value!

For sale I have two Sparkos Labs SS3602 dual discrete op amps. I bought these directly from Sparkos Labs and used them for about 3 hours in my Burson Audio DAC while I was doing some op amp rolling to find the right sound in my system. The op amps sounded very nice but I am going another route so I don’t need these any longer. Again, they were both installed at the same time in the same DAC for the same amount of time, they probably really aren’t even broken in yet, they are basically new. Let me know if you have any questions. Thanks.

Topping A90D Discrete headphone amplifier in black in flawless condition. Includes the RC-16A remote and the power cable. Ships in original packaging (will be double boxed). I ship next business day after payment is received. Ive been selling on eBay since 1999. Check my feedback and buy with confidence!

Up for auction is my used, but mint condition Topping A90D Discrete-Balanced 4.4mm and XLR Headphone Amplifier and Pre Amp. This amplifier is a premium audio device that ensures high-quality sound output with extreme power, without distortion. This is a balanced output amplifier with a relay volume controlled preamp mode for both single ended and balanced inputs, making it a versatile component for any audio setup. This headphone amplifier is ideal for anyone looking to enhance their audio experience. It has two channels and two inputs, providing a robust audio performance. Whether youre listening to music or watching movies, the Topping A90D ensures that every sound is crisp and clear. Sit back with the remote and enjoy your tunes or movies from the couch. The device will come in the original box, with the remote and power cable. I try my best to ship the same day payment is received with insurance and tracking included.

Topping A90D Discrete headphone amplifier in flawless condition, true open box. Includes the RC-16 remote (the jog wheel on the front also has all the functions and settings). Will ship the same day if ordered before 12pm EST weekdays and be very sell packed. Please send a note with any questions for a prompt reply. We ship the same day on orders before 12 noon EST Mon-Fri and 10am Saturday. Your order will be packed and boxed very carefully. Visit our store, we specialize in audio equipment, and constantly have new items arriving.

SPARKOS LABS SS3602 Quantity (1) one Discrete Dual OPAMP DIP8 USA MADE. I have one (1) SPARKOS LABS Dual Discrete SS3602 OPAMP for sale. Tested and Sounds Fantastic. SPARKOS LABS Dual Discrete SS3602 OPAMP, DIP8 form factor.  Designed to update outdated and poor sounding IC OPAMPS, these can bring new life to electronics. Installing these devices in place of ordinary IC op amps in your audio system will yield vast performance improvements ranging from quieter or blacker background due to their low noise performance, and more detailed, crystal clear highs due to their high loop gain and two pole compensation.  

This is like-new. I purchased new, but I no longer need it. This amplifier is very well regarded and sells new for over $700. This unit does not have a remote, it wasnt designed with one. Experience high-quality audio with the Topping LA90 Discrete Hi-Fi Audio Amplifier. This powerful amplifier is perfect for those who want to elevate their audio experience to the next level. With 60W of power and 2 amplifier channels, you can enjoy crystal clear audio with minimal distortion.The Topping LA90 is a sleek and stylish piece of equipment that looks great in any home audio setup. It has XLR audio inputs, 3 number of inputs, and 2 number of outputs, making it easy to connect all of your audio devices. The black color and modern design of the amplifier make it a great addition to any home entertainment system. This unit is extremely transparent and detailed.

I am selling my DAC + AMP Combo- Topping A90 Discrete- Topping D90SEBoth in silver. Im also including the balanced XLR cables.Both work great and are in very good cosmetic condition as can be seen in the photosThank you and good luck

Matched pair pulled from a VTV amplifier. Enhance your audio experience with Sonic Imagery Labs 990Enh-Ticha Discrete OpAmps, designed for DIY OpAmp upgrades. This matched pair of OpAmps is made in the United States and is compatible with burson 252c, 2520 dexa, and audio gd brands. These OpAmps are perfect for amplifier parts and components, as well as TV, video, and home audio systems. Bring high-quality sound to your consumer electronics with this reliable and versatile product. Enjoy free shipping with your purchase of the Sonic Imagery Labs 990Enh-Ticha Discrete OpAmps.

Matched pair pulled from a VTV amplifier. Enhance your audio experience with Sonic Imagery Labs 990Enh-Ticha Discrete OpAmps, designed for DIY OpAmp upgrades. This matched pair of OpAmps is made in the United States and is compatible with burson 252c, 2520 dexa, and audio gd brands. These OpAmps are perfect for amplifier parts and components, as well as TV, video, and home audio systems. Bring high-quality sound to your consumer electronics with this reliable and versatile product. Enjoy free shipping with your purchase of the Sonic Imagery Labs 990Enh-Ticha Discrete OpAmps.

Matched pair pulled from a VTV amplifier. Enhance your audio experience with Sonic Imagery Labs 990Enh-Ticha Discrete OpAmps, designed for DIY OpAmp upgrades. This matched pair of OpAmps is made in the United States and is compatible with burson 252c, 2520 dexa, and audio gd brands. These OpAmps are perfect for amplifier parts and components, as well as TV, video, and home audio systems. Bring high-quality sound to your consumer electronics with this reliable and versatile product. Enjoy free shipping with your purchase of the Sonic Imagery Labs 990Enh-Ticha Discrete OpAmps.

Enhance your audio experience with this pair of fully discrete Burson V6 Vivid Dual Opamps.Compatible with many audio system components.Used for less than a year.Perfect experience with no issues whatsoever (no performance defects).Opamps in mint condition (no cosmetic defects).Free shipping, no returns.Current MSRP: 145 USD.Sold as a pair (two opamps included).

I bought my first USB DAC new in 2021. Iveadded some accessories to it, like a silver vertical metal stand and awell-liked Sparkos Discrete Op Amp SS3602, which is worth $75. Ive kept it ingood shape, and it comes in its original box. You can pick them up from the warehouse where I work, not from a home.

Selling my a90d headphone Amp. Ive kept this in excellent condition, and will be including everything in its original packaging. Feel free to ask any questions. Thanks for looking!

Elevate your audio experience with the Topping A90D Headphone Amplifier. This device boasts top-of-the-line features including a discrete balanced design and compatibility with a wide range of audio devices. The A90D is the perfect choice for audiophiles who demand the highest standard of audio quality.

Elevate your audio experience with the Topping A90D Black Headphone Amplifier. Designed with a discrete balanced technology, this amplifier delivers exceptional sound quality without compromising on performance. With stereo L/R RCA and XLR audio inputs, and RCA and XLR audio outputs, this amplifier is versatile and can be used with a variety of devices.The sleek black design of the Topping A90D Headphone Amplifier adds a touch of sophistication to any home audio setup. Perfect for amplifying your favorite music or enhancing your gaming audio, this amplifier is a must-have for any audio enthusiast.

Amp is in perfect working condition. There are minor cosmetix blemishes. Comes with power cable and remote.

Topping A90 Discrete NFCA Headphone Amplifier Preamplifier 6.35mm/4.4mm Balanced/4-Pin-XLR Headphone Output R2R Relay Volume Control (Silver)Brand New SealedHigh Feedback Seller - Buy With ConfidenceFree Insured ShippingLiquidation Seller - All Sales Final Product descriptionTOPPING A90 Discrete - Fully Discrete Balanced Headphone Amplifier Play VideoProbably the best sound signature of any amplifier Youve heard to date.This is the perfect amp for anyone wanting to get a completely dead-neutral reference sort of amplification.For 600, you cant go wrong.HiFi College is an authorized retailer of TOPPING.Front Panel and Rear Panel Attribute Power input: 100-240VAC 50Hz/60HzSignal input: 1 x XLR (L+R), 1 x RCA (L+R), 1 x EXTHeadphone Amplifier output: 1 x 6.35mm headphone output jack, 1 x 4-PIN-XLR headphone output jack, 1 x 4.4mm headphone output jackLine Out output: 1 x XLR (L+R), 1 x RCA (L+R)Contents list 1. A90 Discrete 2. Remote control 3. AC cable 4. 6.35mm to 3.5mm adaptor 5. User manual 6. Quality card(One-Year Transferable repair and Free Return Policy.)Fully discrete NFCA Upgraded version of the A90.The matched precision transistors ensure unparalleled distortion and noise performance.A90 Discrete vs A90 Include R2R volume relay, remote control, aground loop noise terminator switch, 12V trigger interface, redesigned UI, volume memorization, and more.Ground Loop Noise Terminator When in normal use, set it to GND; and when ground loop noise is encountered, switch it to LIFT. Then the ground loop noise is eliminated.12V Trigger interface Set it to (trigger out) or (trigger in), and it can be turned on and off synchronously with other devices equipped with a 12V trigger interface.Compatible with headphone jack 4-Pin-XLR, 4.4mm balanced, 6.35mm SEDrive different headphones Output Voltage: 49Vpp @Balanced / 25Vpp@SE Output Current: Peak 5A / Continuous 1.1A Output Impedance: >0.1 ?Low distortion In addition to the high output power, the A90 Discrete can maintain ultra-low distortion output under high power load.2 Gain settings low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears.Pre-amp mode 20ohm SE and 40ohm balanced output impedance are widely suitable for connecting a power amplifier to drive bookshelf, desktop, or floor speakers.If working with a Ext90 When working with a Ext90, they could provide totally 4 x XLR and 2 x RCA stereo inputs.R2R relay volume control brings the advantages of precise control, longevity, complete channel balanced and remote control. Also can set to memorize the volume.Remote controller All above operation could be done by a remote controllerWhat pairs well TOPPING D90SE/LE DAC The A90 Discrete can be used with the D90SE/D9OLE DAC, which is almost the lowest distortion HPA + DAC combination.TOPPING LA90 Class AB Power Amplifier The A90 Discrete can also be used as the preamp of the LA90, providing more precise volume control, remote control, and additional input.Features & details ?Fully discrete NFCA also create wonderful amp? A90 Discrete uses fully discrete components to redesign the NFCA (Nested Feedback Composite Amplifier)module. 4 built-in NFCA-Discrete modules which each them uses 39 transistors build up fully balanced structure. The optimized Voltage Current hybrid feedback architecture along with UHGF (Ultra High Gain Feedback) technology provide excellent DC and AC performance.?High output voltage, high current, low output impedance, no headphones that cant be dealt with?High output voltage can easily drive high impedance headphones; High output current allows low-sensitivity headphones to obtain enough power; The low output impedance will not bring unnecessary effect on FR when driving low-impedance headphones. Different headphones can be easily driven by the A90 Discrete.?2 Gain settings? The A90 Discrete has two gain options, which are enough to cover a wide variety of headphones: low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears. Combined with the 0.2uVrms ultra-low noise, even sensitive lEMs will not suffer from any noise.?Ground Loop Noise Terminator? Ground loop noise may be encountered when multiple devices are used in combination. A90 Discrete adds a GND/LIFT switch to solve this problem. When in normal use, set it to GND; and when ground loop noise is encountered, switch it to LIFT. Then the ground loop noise is eliminated.?A Headphone Amp, also a Preamp? When it is in preamp mode, you can get the same high performance as the headphone amp mode, and the 20ohm SE and 40ohm balanced output impedance are widely suitable for various power amplifiers. A90 Discrete can not only switch between the headphone amp (only output from the headphone jack) and the preamp(only output from RCA and XLR), but also support the output from all at the same time

Amp is in perfect working condition. There are minor cosmetix blemishes. Comes with power cable and remote.

Topping A90 Discrete NFCA Headphone Amplifier Preamplifier 6.35mm/4.4mm Balanced/4-Pin-XLR Headphone Output R2R Relay Volume Control (Silver)Brand New SealedHigh Feedback Seller - Buy With ConfidenceFree Insured ShippingLiquidation Seller - All Sales Final Product descriptionTOPPING A90 Discrete - Fully Discrete Balanced Headphone Amplifier Play VideoProbably the best sound signature of any amplifier Youve heard to date.This is the perfect amp for anyone wanting to get a completely dead-neutral reference sort of amplification.For 600, you cant go wrong.HiFi College is an authorized retailer of TOPPING.Front Panel and Rear Panel Attribute Power input: 100-240VAC 50Hz/60HzSignal input: 1 x XLR (L+R), 1 x RCA (L+R), 1 x EXTHeadphone Amplifier output: 1 x 6.35mm headphone output jack, 1 x 4-PIN-XLR headphone output jack, 1 x 4.4mm headphone output jackLine Out output: 1 x XLR (L+R), 1 x RCA (L+R)Contents list 1. A90 Discrete 2. Remote control 3. AC cable 4. 6.35mm to 3.5mm adaptor 5. User manual 6. Quality card(One-Year Transferable repair and Free Return Policy.)Fully discrete NFCA Upgraded version of the A90.The matched precision transistors ensure unparalleled distortion and noise performance.A90 Discrete vs A90 Include R2R volume relay, remote control, aground loop noise terminator switch, 12V trigger interface, redesigned UI, volume memorization, and more.Ground Loop Noise Terminator When in normal use, set it to GND; and when ground loop noise is encountered, switch it to LIFT. Then the ground loop noise is eliminated.12V Trigger interface Set it to (trigger out) or (trigger in), and it can be turned on and off synchronously with other devices equipped with a 12V trigger interface.Compatible with headphone jack 4-Pin-XLR, 4.4mm balanced, 6.35mm SEDrive different headphones Output Voltage: 49Vpp @Balanced / 25Vpp@SE Output Current: Peak 5A / Continuous 1.1A Output Impedance: >0.1 ?Low distortion In addition to the high output power, the A90 Discrete can maintain ultra-low distortion output under high power load.2 Gain settings low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears.Pre-amp mode 20ohm SE and 40ohm balanced output impedance are widely suitable for connecting a power amplifier to drive bookshelf, desktop, or floor speakers.If working with a Ext90 When working with a Ext90, they could provide totally 4 x XLR and 2 x RCA stereo inputs.R2R relay volume control brings the advantages of precise control, longevity, complete channel balanced and remote control. Also can set to memorize the volume.Remote controller All above operation could be done by a remote controllerWhat pairs well TOPPING D90SE/LE DAC The A90 Discrete can be used with the D90SE/D9OLE DAC, which is almost the lowest distortion HPA + DAC combination.TOPPING LA90 Class AB Power Amplifier The A90 Discrete can also be used as the preamp of the LA90, providing more precise volume control, remote control, and additional input.Features & details ?Fully discrete NFCA also create wonderful amp? A90 Discrete uses fully discrete components to redesign the NFCA (Nested Feedback Composite Amplifier)module. 4 built-in NFCA-Discrete modules which each them uses 39 transistors build up fully balanced structure. The optimized Voltage Current hybrid feedback architecture along with UHGF (Ultra High Gain Feedback) technology provide excellent DC and AC performance.?High output voltage, high current, low output impedance, no headphones that cant be dealt with?High output voltage can easily drive high impedance headphones; High output current allows low-sensitivity headphones to obtain enough power; The low output impedance will not bring unnecessary effect on FR when driving low-impedance headphones. Different headphones can be easily driven by the A90 Discrete.?2 Gain settings? The A90 Discrete has two gain options, which are enough to cover a wide variety of headphones: low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears. Combined with the 0.2uVrms ultra-low noise, even sensitive lEMs will not suffer from any noise.?Ground Loop Noise Terminator? Ground loop noise may be encountered when multiple devices are used in combination. A90 Discrete adds a GND/LIFT switch to solve this problem. When in normal use, set it to GND; and when ground loop noise is encountered, switch it to LIFT. Then the ground loop noise is eliminated.?A Headphone Amp, also a Preamp? When it is in preamp mode, you can get the same high performance as the headphone amp mode, and the 20ohm SE and 40ohm balanced output impedance are widely suitable for various power amplifiers. A90 Discrete can not only switch between the headphone amp (only output from the headphone jack) and the preamp(only output from RCA and XLR), but also support the output from all at the same time

Burson V6 Classic DUAL Discrete Opamps (x2) Pair Two Pairs available.