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
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.
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.
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:
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.
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
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.
As always, very beautiful... :)
(and this CS8416! I love this receiver. :kiss:)
Steve Toy
22-12-2009, 14:33
The pics have disappeared. Photobucket suck!
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......?
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
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