NOS DAC based on AD1865

[tenorsaxophone]

Re: Completed !

My prototype of non over sampling CS8414 + AD1865N-K + 6DJ8

But now I have a couple problem of plate voltage of 6DJ8, how many voltage do I need ?

Thanks
Rubudac

Hello Rubudac!
Is it gently possible to see the schematic of the i/v stage of your DAC?
Regards.
Davide.

 

[rubydac]

My tube I/V

Basically I used schematic from Audio Note Dac 2.1X tube I/V but I don't know its voltage.

Thanks
Rubydac

 

[Giordano]

The digital board works fine now, if someone interested I can send protel files, or pdf+gerber.

The output stage is 5687 based prototype one, but with passive filter between digital board and tube section. Now I look for what inter stage trafo I need. Any recommendation is welcome.

Regards,

JG

 

[tenorsaxophone]

The digital board works fine now, if someone interested I can send protel files, or pdf+gerber.
JG

Hello Giordano!
I'm very interested. If you can post PDF + gerber files.
Many thanks. Regards.
Davide.

 

[Extreme_Boky]

I wouldn't mind to see what the end-result looks like....

Cheers,
Boky

 

[rubydac]

AD1865 NON OS DAC SCHEMATIC

Now I'm very happy with this schematic 170V for plate voltage (devider by 2*6922 tubes for SRPP) and 5.1mA bias

TOP LEFT = DIGITAL MODULE
TOP RIGHT = TUBE AMP BUFFER
BOTTOM LEFT = HIGH VOLT REGULATION 160 - 210 VDC
BOTTOM RIGHT = SUB REGULATOR +/- 5 VDC

Thanks
Rubydac

 

[Giordano]

Thanks a lot, I will change the filter to your values also, but I want to try the inter stage trafo also.

I'll make some pictures at the weekend, but the analog section is really a prototype.


tenorsaxophone, I do not know how to send files with the diyaudio messaging. I do not see your email address, so I do not know how to send it. I have sent you a message, but I do not see reply.

Regards,

JG

 

[Giordano]

pix1

pic1

 

[Giordano]

pic2

pic2

 

[Jolojl]

Hi!

Following this thread with great interest ...

I'm playing around with different DACs, I've had 1543, 1545, AD1865 (Rockna DAC) and now 1541, an Adagio. All NOS ... Adagio is extremly good, but also a bit too Hifi to my taste, a tad too smooth simply, my favorite is still 1543 ...

I have also tried the voltage out CS 4397 with just caps, very detailed and it does swing but lacks tone (to my ears ...), more impressive sound than music ...

I have some other DACs on the way; the OPUS (Wolfson 8740) and COD (BB1794) from Twisted Pear Audio, and hopefully (when I get order confirmation) Tentlabs PCM63/(NOS) 1704.

I have PCB boards for Pass D1 output stage, and have built Rudolf Broertjes' SS I/V Gain Stage (DIYParadise Board) ... Haven't had the chance to listen to it though ... Also planning some tube stages ...

I shortcuted by mistake the Rockna 1865 so know I would like to try another NOS 1865 ... The Rockna is very good but too slow for my taste, probably PSU caps or output stage ... (but best (= most magic) soundstage up til now).

Would you share files for PCBs?

Johan

 

[Giordano]

gerber

I attach the files I can, which is under 100k.

JG

 

[Giordano]

schematic

schematic

 

[Giordano]

pcb

pcb

Important !

This is not exactly the same as what you see on the picture. In theory the 1/4W 1206 resistors are fine for the series resistor for the shunt regulator. In prectice they were very hot. I placed small through hole resistors insted on the board alread (the pcb on the picture is designed for 1206 Dm resistors). In the files I attached I have changed the pcb for through hole resistors, so it is not exactly the same.

Regards,

JG

 

[Giordano]

packed it is small enough

altium file

 

[Giordano]

packed schematic

packed schematic

 

[Jolojl]

Giordano! Mille grazzie! Many thanks!

Will keep you posted on findings! Might take some time for the AD1865 though...

All the best!
Johan

 

[sensphoto]

Now I'm very happy with this schematic 170V for plate voltage (devider by 2*6922 tubes for SRPP) and 5.1mA bias

TOP LEFT = DIGITAL MODULE
TOP RIGHT = TUBE AMP BUFFER
BOTTOM LEFT = HIGH VOLT REGULATION 160 - 210 VDC
BOTTOM RIGHT = SUB REGULATOR +/- 5 VDC

Thanks
Rubydac

Hi Rubydac,
would you like to share (bigger file) of sub regulator section? i build the same reg, led as vref and opamp, i would like to try cap filter on feedback resistor.
regards