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Aspen by Granite Audio.
http://www.graniteaudio.com/aspen/
MODEL #823 STEREO HEADPHONE AMPLIFIER. Switches from OTL to Transformer coupled mode. Uses two 6BQ5 and one 12AU7 tubes. Outboard power supply for maximum sonic performance. Has two headphone jacks for you and …
Aspen Headphone Amp | Page 58 | diyAudio
https://www.diyaudio.com/community/threads/aspen-headphone-amp.152031/page-58
Perhaps this is the reason XRK and I decided to collaborate some months back to build a very high quality headphone amp which could drive a rusty nail from DC to light - already we have a schematic, DAC, balanced and unbalanced input, high quality power supplies.
Aspen Headphone Amp | Page 38 | diyAudio
https://www.diyaudio.com/community/threads/aspen-headphone-amp.152031/page-38
Geatan, You are right my friend, I have worked for one of the measurement companies some years ago (Hewlett Packard) and most test equipment is developed out of necessity, not because these guys were bored. If there was someone who could specify a repeatable subjective test I am sure there...
Aspen Headphone Amp | Page 4 | diyAudio
https://www.diyaudio.com/community/threads/aspen-headphone-amp.152031/page-4
Aspen Headphone Amp. ... I tried something similar to this on my patchwork amp and liked the results. It was recommended by jcx (knows his stuff for sure) and displayed a marked reduction in the simulated THD. ... I'm somewhat skeptical of the caps' affect at audio frequencies... In my experience they are only large enough for decoupling.
Aspen Headphone Amp | Page 13 | diyAudio
https://www.diyaudio.com/community/threads/aspen-headphone-amp.152031/page-13
what's the psrr of the amplifier circuit? that will help determine if the regulation needs to be better. mlloyd1 (who is also interested another nice headphone amplifier) Knocked the regulator together and gave it the headphone test with 100 ohm load connected across the output. It is very...
Aspen Headphone Amp | Page 50 | diyAudio
https://www.diyaudio.com/community/threads/aspen-headphone-amp.152031/page-50
Aspen Headphone Amp. Thread starter AKSA; ... Also I had not realised why such high speed was beneficial to the reproduction of audio frequencies before. Kean - thanks for the encouragement I have been thinking about the simulations and the simulated distortion levels in particular. If we are only interested in currents and voltages then a ...
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