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Audio-gd discrete op-amps reviewed: OPA-Earth, OPA-Moon ...
https://www.head-fi.org/threads/audio-gd-discrete-op-amps-reviewed-opa-earth-opa-moon-opa-sun-v-2.397691/
The discrete op-amps were designed mostly as the replacement for the regular op-amps but also as circuits around which you can build your own audio equipment. On the other hand, when going discrete from the scratch, it's disputable to use global feedback loop dedicated circuits, so let's stick to the upgrade role of the Audio-gd discrete op-amps for now.
Audio-gd discrete op-amps reviewed: OPA-Earth, OPA-Moon ...
https://www.head-fi.org/threads/audio-gd-discrete-op-amps-reviewed-opa-earth-opa-moon-opa-sun-v-2.397691/page-10
The discrete op-amps were designed mostly as the replacement for the regular op-amps but also as circuits around which you can build your own audio equipment. On the other hand, when going discrete from the scratch, it's disputable to use global feedback loop dedicated circuits, so let's stick to the upgrade role of the Audio-gd discrete op-amps for now.
Sparkos Labs, Inc. Discrete op amps for amplifying audio ...
https://sparkoslabs.com/discrete-op-amps/
The SS3601 / SS3602 discrete op amps will outperform virtually all audio grade monolithic IC op amps in open loop gain, noise performance, output current, and magnitude of class A bias current. Even the coveted OPA627 monolithic op amp, with a price tag of over 25 dollars, has 30dB less gain and around twice the noise of these discrete op amps.
Audio-GD | Underwood HiFi
https://www.underwoodhifi.com/products/audio-gd
The amps use a Real Balanced ACSS Non Negative Feedback Power supply design with the patent pending Applied "Linear Fidelity" Technology unique to Audio-gd. The amps weight 80 pounds each. Signal to noise is greater than 110dB and gain is 26dB. Input sensitivity is 2.2v for full power thru the XLR inputs.
Do Audio-GD op-amps still perform poorly? : headphones
https://www.reddit.com/r/headphones/comments/5gefny/do_audiogd_opamps_still_perform_poorly/
I have been summoned! Audio-GD doesn't use opamps (although they had a discontinued series of gigantic discrete opamp modules, that were a lot like Burson's similarly huge modules; and a single DAC+amp to plug them into called the Compass), but they use an absolutely phenomenal current conveyer amp design that acts as a single monolithic current mode amp design …
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