balanced line stage schematic needed

[jogas]

Hi,
I have some 6sn7/VT231 and I would like to built a balanced line pre without i/o transformers...
Is there any schematic available?
Thanks in advance
Giuseppe

 

[agent.5]

http://www.tubecad.com/2004/blog0016.htm#MoreAikido


go to the bottom of the page. 12sn7 is just 6sn7 with 12.6V filament.

 

[jogas]

Thanks for the link,
do you think this is a real project or just an exercise?

 

[agent.5]

It is very real, and it is good stuff. Just do a search on Aikido in this forum. Bas even had PCB for sale.