how to connect my corrent output DAC to my preamp TUBE?

[erez1012]

hi all
i just buy the 1796PCM DAC and figure that the output is current (4mA), so i need i/v converter.

before this DAc i have Vout DAC connected to cap and to the TUBE pre amp.

my preamp TUBE is 6N3.

there is option to connect between the DAC and my pre TUBE?

thanks

 

[famousmockingbird]

http://www.diyaudio.com/forums/diyaudio-com-articles/172983-zen-i-v-converter.html

 

[erez1012]

yess i read about the i/v zen and Jocko, but i think maybe use my pre with little modification.
i know about the passive way with 200R and cap, but this is the best solution?
thanks

 

[Koifarm]

yess i read about the i/v zen and Jocko, but i think maybe use my pre with little modification.
i know about the passive way with 200R and cap, but this is the best solution?
thanks

That passive I/V converter i use now for 7 years as mod in my shanling cd100t-se cd player. Sounds for me better then any active solution.

And because your tubestage has 10k input impedance there is no problem.


Ronny

 

[erez1012]

thanks 🙂

 

[andyjevans]

Do you even need a cap into a tube stage? A 200 ohm resistor to ground can go straight into a tube stage with the DC on it, which then becomes part of the bias calculation. This assumes a permanent connection.

 

[erez1012]

hi andyjevans
What you trying to say? That the C1 C2 will do the DC coupling work?
it's not influence the audio quality in i input dc?
Thanks

 

[andyjevans]

I don't understand your question. A previous post showed a 200 ohm resistor to ground followed by a DC blocking cap. I'm saying that you don't necessarily need to block the DC voltage into the grid of a tube - you can use it as part of the bias calculation of the operating point of that tube.

 

[erez1012]

Thanks you right!
200R output DAC give about 1vdc p-p, do you think that is change the linearity of the amp?

If no i can take out the cap.
Thanks

 

[andyjevans]

I've no idea - you'll have to figure that out yourself with the schematic. It depends on the tube input stage.