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APS audio transformers

Custom audio transformers

SALE! Our new Signature Series upgraded MK1 DAC

Parts, Transformers, Misc.
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We have developed one of the best sounding DAC to date.  We take a stock MK1 and compleatly refurbish it with our new Rev 2 transformers, RF shielding, Power Supply upgrades including SR Purple fuse, Our Digital noise eliminators.and tune the DC offset.   We even refinnish the lid.  The unit looks brand new.

What you get is an incredable sounding DAC that outperforms even the newest MK2 DAC even with our nickel transformers installed.  The Signature Series can be idenified by the new APS Audio Badging on the front.

We currently only have black units in stock.  Silver comming soon.



For a limmited time we are including the External Power Board (a $350 value)


Options include our external power board / Power supply.  Leave us a note if you want the External power options.

One year warranty included with your purchase.

About Us

We have been designing and building custom upgrades for the directstream DAC since 2019


You can read some reviews and find out some more info about our products here and here



Contact Us

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We are located in the

Baltimore / Washington area