Follow us| Sign up for our newsletter For over 20 years High End Audio Auctions has been selling the finest HiFi online, but did you know that we BUY your HiFi equipment as well? Contact our sister company STEREOBUYERS for a fair quote today! All items included are pictured. Items are tested fully to ensure all functions work as expected - any defects and additional service done to the item are noted below. Items are not restored or reconditioned, unless specified. All items we sell come with a 30-day warranty - your satisfaction is guaranteed. Original shipping on returns will be refunded at the sellers discretion. Local Pickup in NYC Available Mearson DAC1 Details & Testing Notes Cosmetic Condition:9/10: Excellent - light use, no visible imperfectionsFunctional Notes:Functions as intended and sounds great.Voltage:115V 50/60HZSerial #:4350265Original Box:NoManual:YesPower Cord:YesShipping Method:FedEx Ground (Domestic) / USPS Priority, Ebay Standard Delivery (International)Shipping Weight (lbs):28 (22x18x10) High-End Audio Auctions has been THE trusted source for high-end, classic and vintage audio components on eBay since 2000! Our unique products, unparalleled service and bombproof packaging keeps our customers coming back again and again. We are experts at selling and shipping worldwide, with items ranging from $5 to $50,000. We look forward to earning your repeat business! By placing a bid on any of our listings, you agree to our terms & conditions Click here to learn more Home| About Us| Store Policies| FAQs| Feedback| Contact Us| Custom Tuned Cables _gsrx_vers_1436 (GS 9.0.5 (1436))

Topping A90 discrete headphone amplifier, 1 owner mint. Bought new and sealed a couple of months ago. Sounds amazing, very linear, very clear and neutral. comes with original remote and power cord turns out I don't use it much because i am on the road a lot i have sales receipt to my name absolutely mint and perfect working order please feel free to ask questions and bid with 100% confidence my rating is 100% and i've been on EB for over 20 years prior buyer backed off, so I am relisting good luck!

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 K2L5 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

Topping A90 Discrete Fully Discrete NFCA 6.35MM Balanced Headphone Amplifier. Original boxes and mint condition

Topping A90 discrete headphone amplifier 1 owner mint. Bought new and sealed a couple of months ago. Sounds amazing, very linear, very clear and neutral. turns out I don't use it much because i am on the road a lot i have sales receipt to my name absolutely mint and perfect working order please feel free to ask questions and bid with 100% confidence my rating is 100% and i've been on EB for over 20 years

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 X2J3 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

Two Pairs (total of 4)-Sonic Imagery Labs 995FET-Ticha Discrete OpAmp for use in a 2 channel stereo amplifier. These opamps originated from the input buffer statges of two new VTV-Purifi monoblock amps. They are in as-new condition and sound fantastic! I am upgrading to the Weiss input buffers (which are considerabley more expensive) and I no longer need this set. More detailed technical info can be found on the VTV Amplifier website.This is an excellent price for these high-grade devices. https://vtvamplifier.com/product/pair-two-sonic-imagery-labs-995fet-ticha-discrete-opamp-api-vtv-amplifier/ I ship only to the lower 48 states, and I will package and ship the same day as the order is received if USPS is open.

Sparkos Labs Discrete Opamp SS3602 Dual channel Best Op Amp For Amplifying Audio SignalsDIP8 Compatible PackageCircular Machined Gold Plated PinsSmallest Discrete Op Amp On The Market100% Class A BiasingTwo Pole CompensationNPO Capacitors1% Metal Film Resistors

Like new in condition, it comes in its original box with all accessories.

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 H1A1 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

Topping A90 discrete headphone amplifier 1 owner mint. Bought new and sealed a couple of months ago. Sounds amazing, very linear, very clear and neutral. turns out I don't use it much because i am on the road a lot i have sales receipt to my name absolutely mint and perfect working order please feel free to ask questions and bid with 100% confidence my rating is 100% and i've been on EB for over 20 years

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 T3K1 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 J8D6 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 X8T9 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

This listing is for a Pair (qty 2) Sonic Imagery Labs Model 994Enh-Ticha Dual Discrete Opamps. This would be ideal for upgrading Hypex or Purifi based Class D Power amp or any high end preamplifier that takes discrete op amps. Sonic Imagery Labs USA produces the highest quality and best sounding discrete opamps in the marketplace and this is the chance to get both units for stereo so you do not have to purchase and import from USA. It comes with 3rd party bullet proof hard case for extra protection. Thank you. [Description] Sonic Imagery Labs Model 994Enh-Ticha Dual Discrete Opamps Model 994Enh-Ticha Dual Discrete Operational Amplifier (DIP8dual) No other Discrete Op-Amp on the market comes close to our fully production tested specifications. Dont waste your time and money on High Definition Audio Modules which require a ground wire to operate and have barely enough gain to remain stable and purport to have great THD specs. Dont waste your money on supposedly hand matched leaded transistors for differential input pairs, a few minutes after warm up they arent matched anymore and your CMRR and offset is now gone. Theres a lot of crap out there. Download our datasheet, read, and understand that knowledge is the first step to high performance. Sonic Imagery Labs engineers its products for high performance. Model 994Enh Datasheet and Specifications PDF General Description: 994Enh-Ticha Discrete Operational Amplifier DIP8 The 994Enh-Ticha is a dual high performance discrete operational amplifier designed for professional audio applications and areas where ultralow noise, low distortion and highly linear uncolored performance is required. It was designed as an performance upgrade replacement universal dual op-amp gain block. The pinouts conform to the standard 8 pin dual in-line monolithic IC package, allowing direct replacement. See table 1. on page 6 of datasheet for typical dual monolithic operational amplifiers which can be upgraded. The all-discrete SMT design utilizes an ultra-precision differential super-matched transistor pair specifically designed to meet the requirements of ultra-low noise and ultra-low THD audio systems. In addition to the enhanced input stage, the 994Enh-Ticha uses high performance temperature stable power supply independent current sources. Supply independent current sources allow the bias to remain locked at the optimum operating point regardless of supply voltage. Dual matched pair temperature stable current mirrors, dual matched pair active current loads give the Model 994 its outstanding power supply rejection performance. The enhanced low distortion Class-A output driver stage can sink or source 150mA allowing this module to drive transformers if required. Each amplifier is matched for noise, offset and distortion to within 0.1% of each other and both amplifier channels meet or exceed published specifications.The 994Enh-Ticha op amp is a true bipolar op amp and behaves as such. It does not require a flying ground lead as do other designs on the market. Because the 994Enh is a true op amp, It can also be operated in single supply applications as long as external biasing has been implemented correctly. Because of the 994Enh high current drive capability, supporting circuitry impedances can be scaled down within the application circuit. This can reduce the overall system noise, without increased distortion. Sonic Imagery Labs also can provide a variation of this model that can operate down to ±4.5V for low power applications. Contact us and ask about the 994LV-Enh DUAL. Features: • Ultra Low Total Harmonic Distortion, 0.0003 THD+N @ 1kHz • Ultra Low Noise 0.92nV/rtHz typical • High Current Output Drive (150mA max @ ±24V supply) • +26dBu Output Levels (into 600 ohms @ ±24V supply) • Standard 8 pin DIP Footprint • Operates over ±7.5V to ±24V supply rails • Quiescent Current 17ma • Voltage Gain Open Loop 118dB • Lower output offset voltage than existing counterparts • Lower input leakage current than existing counterparts • Particular emphasis on audio performance • Designed, assembled and produced in the USA • 3 Year Warranty Applications: • Low Impedance Line Amplifiers and Drivers • Active Filters and Equalizers • Summing/Mixer Amplifiers • High Performance Microphone Preamplifiers • High Performance A/D and D/A front end Preamplifier • High Performance D/A I-V convertors • High Current Buffer Amplifier

The a90d chassis seems to be flawless, has no paint defect. I got this one second hand and according to the seller is open box, and I only try it for a hour, so it should be pretty close to new. Although the box is not beat up, it does has a small dent on the top right, as well as some white mark. I do not hear anything off with the sound, and everything is working as intended. You get... Topping a90d Remote Warranty card Instruction card Power cable Box and foam. Thank you for viewing my listing.

Topping A90 Discrete Balanced (Pre-)Amplifier / Kopfhörerverstärker. Biete meinen nicht oft verwendeten Topping A90 Discrete Balanced Kopfhörerverstärker/Pre-Amplifier in tadellosem Zustand an. Technisch wie optisch einwandfrei. Gekauft am 23.08.22. Kaufbeleg kann auf Wunsch mitgeschickt werden. PS: Ich habe auch den passenden DAC hier auf Ebay: Topping D90LE (zumindest falls er noch nicht verkauft ist). Und hier noch ein paar Fakten der Marketing-Abteilung von Topping: Spezifikationen:Technische Daten des diskreten A90-Kopfhörerverstärkers:tHD+ N@1kHz (A-wt):SE IN/SE OUT: <0,000065 % bei Ausgang = 500 mW (32 ?)/<0,000055 % bei Ausgang = 80 mW (300 ?)BAL IN/SE OUT :<0.000080%@Output=500mW (32?)/<0.000060%@Output=80mW (300?)SE IN/BAL OUT: <0,000065 % bei Ausgang = 2000 mW (32 ?)/<0,000055 % bei Ausgang = 320 mW (300 ?)BAL IN/BAL OUT: <0,000080 % bei Ausgang = 500 mW (32 ?)/<0,000060 % bei Ausgang = 320 mW (300 ?)THD@20-20kHz (90kBW)SE IN/SE OUT: <0,00030 % bei Ausgang = 500 mW (32 ?) / <0,00025 % bei Ausgang = 80 mW (300 ?)BAL IN/SE OUT :<0.00030%@Output= 500mW (32?) /<0.00025%@Output= 80mW (300?)SE IN/BAL OUT: <0,00060 % bei Ausgang = 2000 mW (32 ?)/<0,00025 % bei Ausgang = 320 mW (300 ?)BAL IN/BAL OUT: <0,00060 % bei Ausgang = 2000 mW (32 ?) / <0,00025 % bei Ausgang = 320 mW (300 ?)SNR@MAX OUT 1kHz (A-wt)SE EIN/SE AUS: 141 dBBAL IN/SE OUT: 137 dBSE IN/BAL OUT: 145 dBBAL IN/BAL OUT:138dBDynamikbereich bei 1 kHz (A-wt)SE EIN/SE AUS: 141 dBBAL IN/SE OUT: 137 dBSE IN/BAL OUT: 145 dBBAL IN/BAL OUT:138dBFrequenzgangSE IN/SE OUT: 20Hz-40kHz (± 0,1dB)BAL IN/SE OUT: 20Hz-40kHz (± 0,1dB)SE IN/BAL OUT: 20Hz-40kHz (± 0,1dB)BAL IN/BAL OUT: 20Hz-40kHz (± 0,1dB) Content list:1 x A90D1 x Remote control1 x AC Cable1 x User manualAusgangspegelSE IN/SE OUT: 25 VSSBAL IN/SE OUT: 25 VSSSE IN/BAL OUT:49VPPBAL IN/BAL OUT:49VPP Und zu guter Letzt noch das Übliche: Dies ist ein Privatverkauf. Jegliche Sachmangelhaftung meinerseits oder Rückgabe wird hiermit ausgeschlossen. Verkauf nur innerhalb Deutschlands! No sale outside of Germany!

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 I7R9 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 J3K8 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 Y4B2 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 C1J5 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 X5J5 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 P3S2 power supply range: +/- 2 V to +/- 20 VFull power bandwidth: 4 MHz Maximumoutput current: 60mA Signal to noiseratio: 130 dB A-Weighted Total harmonic distortionplus noise: 136 dB Slew rate: 35V/usTypical Offset voltage: 100 µVQuiescent current draw: 3.5 mA (each channel)Dimensions (L x W x H): 10 x 10 x 5 mmColour:silverMaterial:MetalPackage Contents:1 * Oracle II 02 Dual Op Amp

This listing is for a Pair (qty 2) Sonic Imagery Labs Model 994Enh-Ticha Dual Discrete Opamps. This would be ideal for upgrading Hypex or Purifi based Class D Power amp or any high end preamplifier that takes discrete op amps. Sonic Imagery Labs USA produces the highest quality and best sounding discrete opamps in the marketplace and this is the chance to get both units for stereo so you do not have to purchase and import from USA. It comes with 3rd party bullet proof hard case for extra protection. Thank you. [Description] Sonic Imagery Labs Model 994Enh-Ticha Dual Discrete Opamps Model 994Enh-Ticha Dual Discrete Operational Amplifier (DIP8dual) No other Discrete Op-Amp on the market comes close to our fully production tested specifications. Dont waste your time and money on High Definition Audio Modules which require a ground wire to operate and have barely enough gain to remain stable and purport to have great THD specs. Dont waste your money on supposedly hand matched leaded transistors for differential input pairs, a few minutes after warm up they arent matched anymore and your CMRR and offset is now gone. Theres a lot of crap out there. Download our datasheet, read, and understand that knowledge is the first step to high performance. Sonic Imagery Labs engineers its products for high performance. Model 994Enh Datasheet and Specifications PDF General Description: 994Enh-Ticha Discrete Operational Amplifier DIP8 The 994Enh-Ticha is a dual high performance discrete operational amplifier designed for professional audio applications and areas where ultralow noise, low distortion and highly linear uncolored performance is required. It was designed as an performance upgrade replacement universal dual op-amp gain block. The pinouts conform to the standard 8 pin dual in-line monolithic IC package, allowing direct replacement. See table 1. on page 6 of datasheet for typical dual monolithic operational amplifiers which can be upgraded. The all-discrete SMT design utilizes an ultra-precision differential super-matched transistor pair specifically designed to meet the requirements of ultra-low noise and ultra-low THD audio systems. In addition to the enhanced input stage, the 994Enh-Ticha uses high performance temperature stable power supply independent current sources. Supply independent current sources allow the bias to remain locked at the optimum operating point regardless of supply voltage. Dual matched pair temperature stable current mirrors, dual matched pair active current loads give the Model 994 its outstanding power supply rejection performance. The enhanced low distortion Class-A output driver stage can sink or source 150mA allowing this module to drive transformers if required. Each amplifier is matched for noise, offset and distortion to within 0.1% of each other and both amplifier channels meet or exceed published specifications.The 994Enh-Ticha op amp is a true bipolar op amp and behaves as such. It does not require a flying ground lead as do other designs on the market. Because the 994Enh is a true op amp, It can also be operated in single supply applications as long as external biasing has been implemented correctly. Because of the 994Enh high current drive capability, supporting circuitry impedances can be scaled down within the application circuit. This can reduce the overall system noise, without increased distortion. Sonic Imagery Labs also can provide a variation of this model that can operate down to ±4.5V for low power applications. Contact us and ask about the 994LV-Enh DUAL. Features: • Ultra Low Total Harmonic Distortion, 0.0003 THD+N @ 1kHz • Ultra Low Noise 0.92nV/rtHz typical • High Current Output Drive (150mA max @ ±24V supply) • +26dBu Output Levels (into 600 ohms @ ±24V supply) • Standard 8 pin DIP Footprint • Operates over ±7.5V to ±24V supply rails • Quiescent Current 17ma • Voltage Gain Open Loop 118dB • Lower output offset voltage than existing counterparts • Lower input leakage current than existing counterparts • Particular emphasis on audio performance • Designed, assembled and produced in the USA • 3 Year Warranty Applications: • Low Impedance Line Amplifiers and Drivers • Active Filters and Equalizers • Summing/Mixer Amplifiers • High Performance Microphone Preamplifiers • High Performance A/D and D/A front end Preamplifier • High Performance D/A I-V convertors • High Current Buffer Amplifier