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

Topping A90D Discrete Balanced Headphone Amplifier. I bought this from Amazon in September 2022 and have owned from new. Condition perfect and original packaging etc. I’ve just bought the ifi signature amp so no longer need this. I’m also selling my ifi Zen headphone amp on a separate listing. The A90d is very similar to the A90 but has more body and a bit more punch. Not sure what you can by better at this price point. Questions welcome

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 Y9I3 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 R7K3 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 Amplifier and Topping D90SE DAC Stack. Excellent condition, rarely used (only twice). XLR Interconnect Cable, Remotes, and power cables included. Shipping within the US only. Thanks.

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 K8X7 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

2Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 MUSEM8M9 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:2 * Oracle II 02 Dual Op Amp

Topping A90 Discrete Fully Discrete A90D Balanced Headphone Amplifier. Brand new, never used. Shipping or next business day

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 X9V1 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

2Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 MUSEI1S1 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:2 * Oracle II 02 Dual Op Amp

Topping A90D discrete headphone amplifier in perfect condition. See photos for condition, and even a photo of the eBay box it will arrive in (we always pack really well. 24 years on eBay, and weve never had a packaged damaged during shipping). We will ship the fastest practical method and do free upgrades often, depending on location. Will be sent signature required. Visit our eBay store and watch our items to receive discount offers. Please send a note with any questions for a prompt reply. We ship the same day on orders before 12pm EST Mon-Fri and 10am Saturday You order will be packed and boxed very carefully. We specialize in audio equipment, and have new items listed several times each week. Free shipping is USPS only, and we also have UPS and Fedex options available at checkout. All shipping is at eBay negotiated rates with no markup.

1Pcs Oracle II 02 Dual Op Discrete Audio Operational Amplifier NE5532 R3O8 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