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95# 一孤
John Curl在什么时候说的,可否把原话贴出来。
这是John Curl在前天说的话,对于JC-2衰减器他不能够提供更多的资料,因为他没有设计它们,
这直接推耳机的说法从何而来?
ch639827608 发表于 2010-6-8 13:41
This is a low feedback, high open loop bandwidth design, that originally was designed as a cable driver of about 50 ft or more, for the Grateful Dead, 'Wall of Sound' PA system, designed in 1973. YES, we set the original idle at about 50 ma in the output stages in order to operate at peak beta of the 2W, heatsinked high speed devices that we chose. This was trimmed down slightly in the JC-2 line stage, because such need for long cable driving was not as important. 600 ohms was our design target and common in pro sound at the time. The original design used +/- 24 V power supplies, as well, for added headroom. It was pared down to +/- 15V for the JC-2, because the external power supply provided that voltage.
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