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Posted by jon_s (A) on July 02, 2008 at 12:05:51

In Reply to: RE: Sorry, that's conventional wisdom. posted by cheap-Jack on July 02, 2008 at 08:08:25

I'm all for minimizing the number of stages in a circuit, especially when it can improve performance. But there are many cases where two cascaded lower-gain stages offer less distortion than a single higher gain stage. Especially if you need any appreciable output voltage swing, or current drive. I recall some old record player schematics using a single pentode stage from phono to speaker, for use with ceramic cartridges -- I'm pretty sure that can't compete with a typical multi-stage phono / line / power amp design, in measurement or sound.

Regarding distortion cancellation, it doesn't work for perfect devices, since 0+0=0. But 1-0.8=0.2 is a trick that's been used for 80+years in amplifier design.

• Yes, we have to play smart & go by the ears. - cheap-Jack 12:26:40 07/02/08 (3)
  • RE: Yes, we have to play smart & go by the ears. - jon_s 12:48:39 07/02/08 (2)
    • Want to post yr schematic? (nt) - cheap-Jack 13:14:11 07/02/08 (1)
      • RE: Want to post yr schematic? (nt) - jon_s 13:29:13 07/02/08 (0)

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