PDA

View Full Version : 24bit 192khz upsampling tube dac



tubehunter
16-12-2009, 18:46
latest project, this time in 5mm clear acrylic with white oak sides.
12mm clear/transparent blue front panel.
Digital receiver – CS8416
Digital converter – CS4398
Up sampling chip – CS8421
USB IC - PCM2902
Digital input – 1x coaxial, 1x optical, 1xUSB
VVT Transformer, Toroidal transforme
Tube rectification with Ez81
Obligato Film Caps
AmpOhm Paper in oil coupling caps
Kiwame resistors through out
6N3P-DR military spec double triodes

http://i514.photobucket.com/albums/t350/halx00/IMG_4829.jpg

http://i514.photobucket.com/albums/t350/halx00/IMG_4831.jpg

http://i514.photobucket.com/albums/t350/halx00/IMG_4830.jpg

Marco
16-12-2009, 18:51
Oh mammy, daddy... That's wet yer panties stuff, mate - looks seriously lush! :eek:

So....the key question: how does it compare to your copper DAC?

Marco.

Kris
16-12-2009, 18:56
Serious, beautiful bling.

I think I'm in lurve . . .

Rare Bird
16-12-2009, 19:00
Duncan:
who do you get to make the Acrylic to size, everyone i've used always make a cock up of the edge polishing?

tubehunter
16-12-2009, 19:05
i do all my cases myself, as you have total control

Rare Bird
16-12-2009, 19:17
i do all my cases myself, as you have total control



How do you flawlessly diamond polish the edges then?

tubehunter
16-12-2009, 19:25
Start of with cutting to size on the Bandsaw then two grades of files.
Next 240 then 400 then 1200 grades wet & dry and finally Basso gets you there.
Time consuming but satisfying when finished.

Marco
16-12-2009, 19:29
So....the key question: how does it compare to your copper DAC?


Just a brief description; I'm not looking for an 'epistle' ;)

Marco.

tubehunter
16-12-2009, 19:31
interesting

give it a chance, it was only born 30 minutes ago!

Ali Tait
16-12-2009, 19:35
That looks the business Duncan.Very nice!

Ian Walker
16-12-2009, 19:40
Oh mammy, daddy... That's wet yer panties stuff, mate - looks seriously lush! :eek:

So....the key question: how does it compare to your copper DAC?

Marco.

Its nearly as good as the copper but nowhere near as good as my brasso boy!:lol::lol::lol::lol:

Marco
16-12-2009, 19:47
interesting

give it a chance, it was only born 30 minutes ago!

Ah, that I didn't know.... Was it a straightforward procedure or was a caesarean section needed?

Most importantly though, have you breast-fed it yet? :lol: :eyebrows:

Marco.

Steve Toy
16-12-2009, 20:32
I'll hear it on Monday.

leo
16-12-2009, 20:34
Nice work Duncan, do you use the differential out of the CS4398 L&R to feed the tube stage ?

I've had a few folks wanting me to try a tube stage on the out of my Sabre dac, should be a laugh anyway

Marco
16-12-2009, 20:41
I'll hear it on Monday.

Wotcha going up for then, Toyster? :)

Marco.

tubehunter
16-12-2009, 20:45
As i don't use a tube differential topology, no, just the minus as this tube stage design inverts it.
I have tried it with other projects which haven't been this successful.

Alex_UK
16-12-2009, 20:58
Well done, looks lovely!

Themis
16-12-2009, 22:04
As always, very beautiful... :)

(and this CS8416! I love this receiver. :kiss:)

John
16-12-2009, 22:09
Lovely work Duncan

Steve Toy
22-12-2009, 14:33
The pics have disappeared. Photobucket suck!

Alex_UK
22-12-2009, 15:13
And on Duncan's copper dac threads too, so suspect a problem with his account/folders?

electric beach
23-12-2009, 08:47
And on Duncan's copper dac threads too, so suspect a problem with his account/folders?


Aaah, glad you wrote that Alex, I've been trying to get to those photos of the copper dac and the brass version by fiddling with the browser settings for a couple of weeks now! Got a work colleague to look yesterday, when he couldn't see them either we assumed it was some limiter on the server. :doh:

Ian Walker
23-12-2009, 19:37
Here they are:)

electric beach
23-12-2009, 22:03
Thanks Ian. That had the desired effect - Valerie likes already! :eyebrows:

Ian Walker
24-12-2009, 00:02
:)Which one does she like best though......?

leo
24-12-2009, 11:13
I presume these are the dac boards http://cgi.ebay.co.uk/Hi-End-24bit-192KHz-Up-sampling-DAC-Kit-with-USB-input_W0QQitemZ160365347393QQcmdZViewItemQQptZLH_D efaultDomain_0?hash=item2556850241