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Romy the Cat wrote:

….when it drives what it is willing to drive then the APS PurePower delivers the Sound that makes me willing to write a request to Pope asking him to canonize that damn regenerator.

Romy the Cat wrote:

To be honest I have to tell that I did detect some APS own coloration at top octaves. I did not research this subject further

Romy the Cat wrote:

….Two of my APS had own that made them semi-dysfunctional, including my current APS unit…

Today I decided to look deeper into the abovementioned “APS’s own coloration at top octave”. I took some of my favorite mono recordings that I know well (one of my Super Milq is dissected) and was trying to played them. It was no go. It sounds incredibly wrong, superbly sharp, very obnoxious and with no bass. I was scratching by head thinking what the hell is going on. Believe me or not but the sound got fixed when I plugged my transport, DAC and preamp to … the wall instead of the APS regenerator.

OK, let to be honest about it, my unit runs now with experimental APS prototype main-board and output of this board has a problem, the problem that is objectively visible with simplistic measurement tools. The APS guys I agree that it is not right and have no problem to replace the board. I do not “incriminate” to the APS the defect with the prototype board – it happens, no biggy. However, the new prototype board incorporates also some updates that APS did with their unit and it  DOES make me VERY concerned. Does the sonic problem that I am experiencing derive from the specific defect that my prototype board has (highly likely) or those problems derive from the modifications that APS inflict to the unit? That is the big and VERY important question to which I have no answer as now.

I have to tell that before now, writing the post above, I did not spent any time to assess the sound of the unit as I was very much pissed about the “no input choke status”. It is important to note that the sharp sound of my current APS regenerator is very different from the “vintage” APS loaded into input choke – it was I was looking yesterday.  All, my positive comments about APS sounds were about the sonic results that I got from my initial APS regenerator, that one that I did listen. It would be very sad if the newest APS updates (I do not know if I am at liberty to say what they did) would have negative influence to sound. Perhaps then I could open a new chapter of my APS saga with a name “hunting for a vintage APS unit”… :-)

Anyhow, I hope that the problem is not with the updates (that might be reasonable in term of circuit operation) but with the objective defect that I have now and the all issues with Sound will go away when the defect goes away.

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