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Headphone Systems Everything to do with Headphones

Marsh headphone amp from Linear Audio
Marsh headphone amp from Linear Audio
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Old 12th October 2018, 05:12 PM   #1561
DualTriode is offline DualTriode  United States
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Default It sounds wonderful and effortless. It whispers and then kicks like a horse.

Hello Richard,

You ask all the time, How does the amplifier sound?

It sounds wonderful and effortless. It whispers and then kicks like a horse.

I have posted here several times. Thanks to Jack in NJ, I bought his PCB and matched parts kit.

I also have built your amplifier on perf board with my matched parts. Matched with a Keysight Source Measurement Unit, B2902A, with EASYExpert software. The better the parts are matched the better the amplifier measures.

This amplifier easily tests below 0.005% distortion on the APx555. I have built and tested many headphone amplifiers. This one tests better than all the rest.

Thanks DT
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Old 18th October 2018, 07:44 AM   #1562
RNMarsh is offline RNMarsh  United States
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Location: 2457 Cascade Trail; Cool, CA. 95614
And also thank you, DT for the sound review. It makes my day at age 72 a little brighter :-)


THx-Richard
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Old 18th October 2018, 09:58 PM   #1563
RNMarsh is offline RNMarsh  United States
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The idea was to use the fewest number of transistors possible and at the same time have very, very low distortion driving headphones of various load Z. But, using low - mid mount of FB.

Second, was to be direct-coupled, complimentary push-pull topology operating in current feedback mode; Producing wide open loop BW and have high slew rate. (SR = 145v/usec).


THx-RNMarsh

Last edited by RNMarsh; 18th October 2018 at 10:07 PM.
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