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This could be a truly great h/amp with just a few essential changes. As it is the sound is very good indeed - it's open, spacious, voices sound 3D. I make this statement with serious caveats - the volume control is a joke. There is a very small window of listenable sound, this is crazy and need not be. A standard Alps Blue shunted with decent resistors cold be made as standard and made easy for those with soldering skills to use resistors of their choice - it cannot be over stated just how incredibly better a shunted pot sounds - best of all it's cheap to implement for the makers, just make it easy to change the resistors for those than can and want to.
Many have questioned the mains Tx - is it truly rated for USA/Europe voltages? - it should be. The actual chassis whilst very attractive could be made bigger and deeper. The point-to-point wiring is very well done and can't be faulted. There is no need to implement a pre-amp output, just keep the D/V as a headamp. The output caps are crucial to the sound, make it easy for those who can to be able easily to change these caps.
To sum up - a shunted pot (take a look at the World-Designs site/ FAQ section to see what this is) - a properly rated mains TX - larger chassis - easily changed output caps - a headamp only, no pre-amp section.
Implementing these changes will increase the price but it should'nt be by much and then you have a truly superb headamp which will thrash so many of it's competitors.
How did you come to the conclusion that the power transformer is not correct?
Check out the comments on various forums.
I'm not doubting you, but since I don't know which various forums and posts to look for and you have read them. Could you just let us know what you have found. I have searched for transformer specs for this amplifier and haven't found anyone who has checked it in an isolated state. I was hoping it was a center tapped transformer but again nobody seems to know for sure. From an economic standpoint it would make sense to stock one part and center tap it for US voltage.
Hoping you can supply an answer so that I won't have to disassemble the amp to check for myself.