Tube output stage for voltage DAC ?

Hi,

I got a CS4398 evaluation board. The XLR output sound great but I would try a tube output stage.

I did not found a lot of example :

Broskie cathode follower : http://www.tubecad.com/2006/08/blog0075.htm (no gain required)

Thorsten Loesch design (can't find the link, I got only a paper copy).

Does someone have experience in balanced voltage output dac with tubes ? What advice could you give ?

Thanks a lot
 
mgm31 said:
Hi,

I got a CS4398 evaluation board. The XLR output sound great but I would try a tube output stage.

I did not found a lot of example :

Broskie cathode follower : http://www.tubecad.com/2006/08/blog0075.htm (no gain required)

Thorsten Loesch design (can't find the link, I got only a paper copy).

Does someone have experience in balanced voltage output dac with tubes ? What advice could you give ?

Thanks a lot

Hi

Have a look at Lukasz Fikus's site at:

http://www.lampizator.eu

He has extensive experience with current & voltage out DACs & has on his site mods done to dozens of players. I have changed my Arcam 70.2 discrete output stage to a tube output stage as per the lampizator circuit, and the difference is huge. And this is considering that I already had various mods done including audiocom clock 4, BG NXs in powesupply, some NX hiQ caps for DAC decoupling, super regulators, disabling digital out etc etc.

He also has a step-by-step guide which is excellent. However, you need to make sure you feel safe with dealing with high tube voltages which can kill.

Regards

Fib
 
Many thanks, especially for the lampizator link I didn't know

Yes, Opamp inside DAC are poison but at this time I got Opamp for filtering too. I can't throw my CS4398 eval board to the dust bin.....

The lampizator schematics seems not to deal with Vout+ AND Vout- but use only one output (Vout+ ?).

I'm searching a real differential schematic as explained in the tubecad journal.

The project is on my working table : I modified an aikido to this purpose. I'm waiting some parts for the power supply.
 

poynton

Member
2005-03-10 11:57 pm
UK