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Guys, I am not kidding, something is VERY right in the sound of that tuber crossover combined with my SS amp. Even the ULF in this configuration has some properties that I would like to have improved but the from more holistic perspective the integration with the rest of my playback is beyond reproach, much better  then I was able to get from pure SS amp. In fact it reach the desirable level of seamlessness that I had in my old room with all tube gear driving the entire system and including bass driven by my 6C33C DSET.

As in anything that I am trying to expose at my site there is some interesting educational aspect. I always was pitching that in case multi-aping all channels must be driven by amplification with the same harmonics structure and the most important with the same pattern of changing harmonics with volume. I spent a LOT of efforts to accomplish it in my old room but try to do it if you need 150W of SET power for ULF? It looks however that that tube crossover made the tandem of crossover and SS power amp pushed my integration to more proper integration route. I do not think that I got where I would like to be but the direction of overriding the stupid harmonics of SS amps with tubes I find is very perspective.

So, how many people out there run tube powered playback with powerful SS amp at the bottom? Many-many of them. How many people have bass sound differently than the rest of the system? Practically all of them. Do you feel that it is an opportunity for a right commercial product to be introduced to address a problem? With proper explanation of the subject and proper demonstration of the success I think it might be VERY successful product and the most important that it will have absolutely no competition.

Take a look what I propose. I powerful 100W-200W SS class A/B output stage with PS that has a few voltages switches. Thai would allow loading output stage properly against load of multiple impedances. Of course the adjustable idle current – this along with voltage would assure the perfect symmetric clipping at desirable power level against ANY load. A tube based gain stage and tube based driver stage. A low pass adjustable crossover between the stages, perhaps 12dB per octave in open loop and 12dB in local feedback.  A harmonic correction circuit with exposed controls to user. Now pretend that it all come in one package, properly calibrate and voiced, would it be wonderful?

If some of manufactures would like to undertake this task then I will be willing to contrite my efforts to help with evaluation of prototypes and offer some sonic recommendations.  I think it might be a very good and useful product.

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