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-   -   ACP+ Preamp/HPA for Yarra Preamp (https://www.diyaudio.com/forums/group-buys/355617-acp-preamp-hpa-yarra-preamp.html)

xrk971 5th June 2020 07:33 PM

ACP+ Preamp/HPA for Yarra Preamp
 
6 Attachment(s)
Vunce and I have both built the verification boards for the Pass ACP+ preamp / headphone amplifier in Yarra daughterboard format. This format also is compatible with the M2X amplifier front end bolt holes. Requires +24v supply and can be used as a standalone preamp/HPA.

https://www.diyaudio.com/forums/atta...592e7a373-jpeg

The design is basically a miniature Aleph based output stage with a Aleph J or J2 front end (?). It sounds super and is very powerful with deep bass authority. A very nice sounding preamp that has tons of headroom. You will enjoy the sound immensely.

It is a mostly SMT layout in order to make it small enough to fit in the Yarra/M2X board format. However, the small tight layout contributes to an exceptionally low noise and great sounding design.

Thanks to Mr Pass for giving us the go-ahead to make this design for the Yarra/M2X. Thank you to JPS64 for another superb layout.

https://www.diyaudio.com/forums/atta...b464e7678-jpeg

https://www.diyaudio.com/forums/atta...e6136ca2e-jpeg

https://www.diyaudio.com/forums/atta...e3020cfd2-jpeg

https://www.diyaudio.com/forums/atta...47cc41fd4-jpeg

https://www.diyaudio.com/forums/atta...a5b252af9-jpeg

Please add your name, number of boards, and country to the interest list below if you would like to see a GB for this happen. Boards will be the usual price of $12 each and 1.6mm thick 1oz copper, ENIG finish. Green solder mask.

GB Interest List:
For example...
JohnDoe / 2 boards / USA

Edit Dec 24, 2020: BOM is here https://www.diyaudio.com/forums/atta...4&d=1608844039

MShipmanPE 8th June 2020 03:29 AM

MShipmanPE/2 boards/ USA

BigE 8th June 2020 10:52 PM

Is the SMT available already populated?

thompsontechs 8th June 2020 11:02 PM

Quote:

Originally Posted by BigE (https://www.diyaudio.com/forums/group-buys/355617-acp-preamp-hpa-yarra-preamp-post6235174.html#post6235174)
Is the SMT available already populated?




Lol I was just going to say, if you solder those little bastards Ill take two lmao


Also, are we going to see Chassis for Yarra? You have a new Yarra I think I read somewhere.

thompsontechs 8th June 2020 11:08 PM

MShipmanPE/2 boards/ USA
thompsontechs/2 boards/USA God Bless it in these trying times!

xrk971 8th June 2020 11:37 PM

Quote:

Originally Posted by BigE (https://www.diyaudio.com/forums/group-buys/355617-acp-preamp-hpa-yarra-preamp-post6235174.html#post6235174)
Is the SMT available already populated?

There is not enough demand for this to be populated by a factory pick and place. So it would be slow manual labor - let me think about it.

diy40 8th June 2020 11:40 PM

MShipmanPE/2 boards/ USA
thompsontechs/2 boards/USA God Bless it in these trying times!
diy40/2 boards/USA

Carl_Huff 8th June 2020 11:57 PM

ACP Daughterboard
 
MShipmanPE/2 boards/ USA
Carl_Huff/ 2 boards/ USA

mnichols30030 9th June 2020 12:06 AM

ACP Daughterboard
 
MShipmanPE/2 boards/ USA
Carl_Huff/ 2 boards/ USA
mnichols30030/2 boards/USA

thompsontechs 9th June 2020 12:36 AM

Thanks for deleting GBA, nice touch, what was it about God Bless America was offensive? You didn't type it, but thought you should sensor?


Cancel mine X I know it wasn't you, but this crap just chaps my ***.


JT


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