My current project is modifiying my spare DCX-2496. I am removing the ouput gain stages and rather than replacing it with a capacitive or transformer type output section, I am replacing it with a 12AU7 tube type output section shown here.

This is a single tube gain stage available from Decware.

Here is a pic of the assembed gain stages. There is barely enough room to install in the chassis. The power supply willl be in a remote chassis.

I ended up not using the Film and Foil Dayton caps, due to space considerations, I installed the originals that came in the kit on the bottom side of the board. 

I also changed the output connectors to RCA.

So far the modified output stage seems to be working perfectly. I have not not had a chance to scope the unit, but is sounds good, and I am pleased with the performance so far.

I know trying to describe sound is pretty much a waste of time, but could you make an attempt.

Nice job btw!

DeanG:

I know trying to describe sound is pretty much a waste of time, but could you make an attempt.

Nice job btw!

Adding the gain stage was needed because I did not have enough gain to drive my Decware SE-84c amps with the capacitive output mod, and I had never seen a tube output done on a Behringer.

Currently I have a set of CONN 12AU7 tubes driving the output, the CONN have a rolled top end great midrange detail and solid bass. After I scope the unit, I will change the output tubes to Bugle Boy and do some serious listening. 

Dave.

Very cool, nice job.

 Yeah, I'm with Mark, that's really cool. Not too many of those sitting around.

Thanks Guys.

I think this may be one of a kind.

I will post the results after I scope it this monday or tuesday.

Dave.

Looks great as usual.  This little hobby of yours is getting pretty involved, any plans on making this a full time deal?

Pete H:

Looks great as usual.

Pete H:

This little hobby of yours is getting pretty involved, any plans on making this a full time deal?

Dave.

GotHover:

No, it's just for fun.

Dave.

Pete H:

It wasn't fun for me when I came in from the shop last night at 11:45 and was hammered on by the GF about why it took so long to just cut a few holes wood. 

Well, it's not going to get better from here on out.  Ratro!

Got some testing done on the Tubed Behringer, and all is well. No noise issues and great response 10hz to 20khz+

This Decware gain stage works perfectly.

Yellow is input, red is output. All channels tested and perform Identical.

50hz saw