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On 4/18/2015 1:42 AM, John Haley wrote:
> I looked the link for the EMT JPA 66 and I see that it is a tube preamp
> unit, which basically eliminates it from serious consideration for
> restoration work, whatever the price tag.  When we are capturing audio at
> 96/24 these days, we want to catch all the transient response we can, and
> we don't want tube equipment slowing that down and mucking it up.  If
> people like the "euphonious" sound of tubes, that's fine, enjoy it, but in
> my view it's not really appropriate for serious restoration work.  The
> tubes are actually adding a kind of distortion that some people like, a
> kind of sonic haze, but that's counterproductive when you are trying to get
> the truest, clearest, best sound possible out of old sources.  It's just a
> fact that tubes simply can't move at the same speed as transistors.

That fact will come as a major surprise to the designers of radar 
systems and TV transmitters & receivers, which did their jobs well in 
the era before transistors. Not to menion Tektronix oscilloscopes.

Well-designed tube circuits can have transient response as good as 
transistor circuits, and incredibly low distortion as well (with the 
application of negative feedback). I'm sorry, but the idea that 
"euphonic distortion" is an inherent characteristic of tube circuits is 
one that's been carefully nurtured by the purveyors of tube hi-fi gear. 
I'll go on record as saying categorically that it ain't necessarily so.

Peace,
Paul

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