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JK Richards PS Audio DSD MKI transformer upgrade

I sent my PS Audio DSD MKI to JK Richards to be fitted with the upgraded nickel transformers and VOCM caps. Should be arriving today. Will follow up with a comparison review  once the upgraded DAC settles in. 

Here is a link to the lengthy thread covering the evolution of the PS Audio DSD mods.

https://forum.psaudio.com/t/modding-the-directstream-dac-mki/2680

gme109
jk_richards's avatar
jk_richards
299 posts
 

Advancements in Audio Transformer Technology for Superior Sound Reproduction.

Continuing R&D on audio transformers brings you closer to reality in sound reproduction.

New style APS transformers.

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richardselectronics's avatar
richardselectronics
24 posts
 

The new Vocm buffers currently in use now significantly affect the sound quality. This innovative approach to generating the virtual common power (Vocm) for the op-amps is nearly equivalent to using a bipolar power supply.  The old method of using a simple resistor divider and patching the impedance issues with capacitors just does not have the sound quality of the active buffer. The dynamics has improved dramatically as well as the bass being much tighter and more coherent.

With the old vocm method, the impedance varies by frequency from over 60Ω ohms at DC to .15Ω ohms at the resonate frequency of 100 kHz. It is not linier.

With the new active Vocm buffer, the impedance is a fraction of an ohm at DC and at all audible frequencies. This is what you want in a power supply. 

 

 

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