一个高精确度唱机的前置放大器

独立电唱机前置放大器
一个高精确度唱机的前置放大器(中文15000字,英文7900字)   
1．介绍
最近有非常多关于历史悠久的真空电子管的优点（和缺点）的新闻。至于这种复古运动多少是基于可论证的理论，多少是建立在发烧友的怀旧情怀和主观印象的基础上，这个问题可能会是一个充满争议的辩论。
我们现在很清晰的是：现在对真空电子管，这种20多年前的，被认为和spats 和top hats一样古老的东西，有相当多的人进行关注。现在潮流有点倒转的感觉，有许多的生产厂家又为高保真音响爱好者，音乐家以及高保真发烧友们提供电子管装置。很多情况下，这些都是一些简陋的古老的（或者我们应该说是“最佳的”电路稍微做了些改动，就变成了一个新的创作品。别的产品提供了新的真空电子管技术的途径，同时添加了我们学到的一些真正的值得的设计。

Standalone Phono Pre-amp
A HIGH-PRECISION PHONO PREAMPLIFIER
by Fred Nachbaur, Dogstar 1997,
1: INTRODUCTION
There has been much press lately about the merits (and drawbacks) of the venerable vacuum tube. How much of this retro movement is based in demonstrable principles,  and how much is rooted in nostalgia or subjectivity is a debate that could fill volumes.

What is clear is that there is considerable renewed interest in vacuum tubes, a technology that even two decades ago was considered as obsolete as spats and top hats. Now the trend is reversing, and a number of manufacturers are again supplying tube gear for audiophiles, musicians and hobbyists. In many cases, these are simply vintage circuits in new packaging. Other products offer new approaches to vacuum tube technology, adding what we've learned in the meantime to come up with some truly noteworthy designs. The project described here fits into the latter category.
 

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