UltraAnalog D20400A

[apsietje]

I'm searching for my DAC2 Threshold the DAC-chips UA D20400A ? Is there anyone thar can help with OEM-chips, replacements or have anyone the datasheet from that UltraAnalog? The T-DAC2 has 2 DAC-stages. Ist this unit a current or a voltage DAC?

A lot of thanks for help !!!

 

[wintermute]

derekli168 please don't post personal emails in threads. Use pm or ask other members to pm you 🙂

 

[derekli168]

Hi every one, anybody could tell me where I can buy used UltraAnalog D20400A? Thanks a lot.

Derek

 

[kostavox]

Have UA DAC 20400

Hi Guys,
I have a DAC 20400 for sale from my DAC series "Masdac" . I actually preferred the sound of this version to the "A" version.
rgds
Kostas Metaxas
Metaxas Ultimate Hi Fi Audio Amplifiers,Electrostatic Speakers and CD Systems

 

[stoolpigeon]

Hi Kostas, how much are you after?

I have a Masdac which has some problem that I can't recall so I could be interested in any parts and a schematic.

What was the part in the purple aluminium case?

Thanks, sp

 

[kostavox]

Hi Stoolpigeon,
AUS$300 for the DAC20400 and I might have another APOGEE C768 Clock [the purple thing] in stock.
rgds
Kostas

 

[stoolpigeon]

Thanks Kostas,

I will try to find the pcb or some notes I made regarding the fault so I can decide what to do. I have in mind the problem was in 1 channel so that would probably rule out the clock.

Cheers, sp

 

[Zero Cool]

A co-worker has some Ultra Analog modules for sale. PM me your email address and which module you are looking for and I will pass it on to him. if he has what you need, he will be in contact.


Zc

 

[chrisautosound]

D20400 replacement update

I just finished a drop in replacement for the D20400 in the Levinson No35. like the No30.6, It uses two PCM1704K and OPA627.

At first I thought there was a data format problem since the output was very distorted. But the problem was the No35 bit clock driver IC sucked. The long BCLK trace to the DAC is about 8 pF and the original IC MCxxxx could only pull up 0.5 mA. So a poorly shaped 1 V p-p is all there is, but for the D20400 it worked. The replacement SN65XXX delivers a beautiful BCLK and all is good.

I got the idea from the Levinson No30.6 where they did just about the same thing but their board is NLA and was $800. I also used dual PCM1704K and OPA627. So it also measures and funtions almost exactly like the D20400 but I included a 2 pole LPF to reduce out of band noise. I still need to try it in our No30 and No30.5.

S/n 114 dB un-wtd 22-22kHz. Low 0.0020% distortion with 16 bit data.

Yippee!
as of 08/17/2011 I also have a version that drops into the Levinson No30.5 with no other parts or changes. Thanks to the client that needed it done. He is now the first No30.5 customer in many years to have a successsful repair.

Although ANYONE that has opened the 30.5 knows that "drops in" really means hours of disassembly. and if you want the thing to last a long time recap it too, that only adds another day to the repair.

 

[NATDBERG]

I'm searching for my DAC2 Threshold the DAC-chips UA D20400A ? Is there anyone thar can help with OEM-chips, replacements or have anyone the datasheet from that UltraAnalog? The T-DAC2 has 2 DAC-stages. Ist this unit a current or a voltage DAC?

A lot of thanks for help !!!

Hi Apsietje - Voltage output.

Uses some high frequency op amps (AD714? - from memory) before the output of the package I guess as part of I/V conversion.

You have to think of it as a package rather than a chip. Only a couple of custom chip in the actual unit - "custom CMOS IC, custom thin-film resistor networks" so they could be repaired in theory but delicate work and would rely on it being a common part that's broken.

I have the datasheet as a pdf.. will happily email it to anyone. PM me.

Alternatively I'll try to put in on a filesharing site like megaupload as it's too large for an attachment on here (500Kb) and I don't have Acrobat pro to split or crunch it.

Have a search around the web though as there are some photos around with the resin removed to reveal its innards.. Chinese hifi websites. Search DAX too.

 

[vadimgal]

UA D20400A module for sell

I have one NOS UA D20400A module for sell. For interested parties contact through private mail.
Thanks.

 

[thanhBMTVN]

I'm interested.
Please email me.

I'm interested.
Please email me. truongsonschool@gmail.com
Truong Thanh

 

[thanhBMTVN]

I have one NOS UA D20400A module for sell. For interested parties contact through private mail.
Thanks.

I want to buy 02 pcs NOS UA D20400A. How much ? and how pay money for you. How long is you send D20400A for me:
Nguyen Viet Truong Thanh
Trung Son School
164 Phan Chu Trinh - Buon Ma Thuot city
DakLak province - Viet Nam

 

[derekli168]

I am still looking for two UA D20400A modules. If anyone know the source to purchase, please PM me. Thanks.

Derek

 

[Zaschke]

I saw parts connexion sells Pin Compatible DAC Modules (Replacement for UltraAnalog D20400(A) , (Sonic Frontiers Repair Parts)
But i dont know what parts are in there and how these sounds compared to the original Modules!?
Maybe somebody here has experience with this???
Ron

 

[abraxalito]

I'm curious about that module - there's no spec sheet but they say the performance is equivalent to, or even better than the original. Which would be quite a feat as there was a fair degree of 'secret sauce' involved. It would be very interesting to learn who has developed this module for PCX, particularly as the price is only $250.

 

[tonimxp]

Sonic Frontiers sfcd1 PCB replacement ultra Analog D20400A with dual AD1862

Hello! This Is my solution for UA D20400A
It work fine and It give a very nice sound.

 

[Arnolddew]

Very nice. I don't have a UA dac anymore. But if i have i would wanne have this for spare.

 

[tonimxp]

I Will sell It coming soon on eBay, stay tuned

 

[vadimgal]

D20400 module

What assemblies did you use for OPA1 and OPA2 ?
Thanks.