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Noir, a two transistor headphone amp: class-A, single ended, 150mA bias
Noir, a two transistor headphone amp: class-A, single ended, 150mA bias
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Old 21st November 2020, 11:18 AM   #261
mokaonli is offline mokaonli  France
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Default My amp Noir

Hello,
I left aside my F6 while waiting for the arrival of the new JFETs, and started building the Black amp, and here it is.

Due to a problem with the blue Alps, which is totally asymmetrical, it will go to after-sales service, I replaced it temporarily with 2 10k.
the amp sounds beautifully on my Focal Elegia headphones, I rediscovered this headphones.

On the other hand, I did not use the SMPS power supply, but a more conventional power supply (toroidal 15v and 20,000uf Nichicon KG capacitor) to power it, I only have 22v in output, I don't think that the affected.

I am waiting for another power supply with 84 capacitors to finalize the assembly. and I reserve a subtle dressing for it, I will post the photos when it is finished.

Thank you so much Mark
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Old 21st November 2020, 12:19 PM   #262
avtech23 is offline avtech23  Australia
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Noir, a two transistor headphone amp: class-A, single ended, 150mA bias
Nice.

It's good practice to elevate the 68 ohm resistors a little from the board so they don't cook it too much.

Will be interested to hear your impressions with the final PSU installed.
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Old 21st November 2020, 08:38 PM   #263
mokaonli is offline mokaonli  France
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I reassure you, they are well raised from the circuit, 5mm to be precise, it is the photo taken from above which crushes the perspective.
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Old 21st November 2020, 10:07 PM   #264
Mark Johnson is offline Mark Johnson  United States
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Noir, a two transistor headphone amp: class-A, single ended, 150mA bias
Wow you used the SMD version of the Current Regulator Diode! Congratulations.
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