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It did not last long….

Just a couple days back I was thinking that I will live with my current lower bass for a while and now I feel that I will not.  I do not feel that my current ULF is wrong. In fact I feel that it is truly superb but I would like to add to it one character, still without losing what I have.  I do not want to change my lower bass but I would like to a very very very very very very minor degree to add some SS hardness, still preserving all long and beautiful LF harmonics that I have now. I am sure that no one would recognize it but I do. I do have some kind of nostalgia to my bass in old room. Even though in my current room I have in a way better a sound and better lower bass but I need to deLamminise my lower bass. My lower bass now has the quality that I did not like in Lamm ML2.0. With all phenomenal integrity of Sound in that amp it did not sound hard when it called upon. I was forced to idle the Lamms output stage very aggressively but then Lamm has no power when it drove 32R with 4R tap. Even in that configuration it was too polite. Milqides and then DSETing long change it but now with 4 stage Modified Marchand tube crossover and B2 amp I find myself in the same boat. I have very-very good bass but if music is called to rock-hard stress of the very leading edge then my ULF handle it a bit overly elegant.

So, What I am planning to do it to revise my Marchand crossover further. Here is the plan:

1)      Get rid of input stage and let my preamp to drive the filters directly.

2)      Get rid of output stage, moving the attenuator to the power amp.

3)      Slightly add current to the remaining 2 tube, dropping grid resistors from 180K to 160K

4)      See what happened then

I will get rid of half of the tubes and it might do the trick. I also consider using 6N6P instead of the 12AX7 as they might be better in cathode followers. They have the same ping and just need 6.3V, since I will have just two tubes left then I might connect them in series and to use the default Marchand  12V power supply…

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