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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: 627 is a VFB, unity gain compensated device posted by wildmonkeysects on June 25, 2001 at 15:54:06:
wildmonkeysects posted on June 25, 2001 at 15:54:06:
"..... I realize that much attention is given to output stages, but it is my mild mannered contention that the input stage is what sets the sonic signature, or lack of it. If the input differential pair is perturbed in any way, ie not close to textbook perfect over time, temperature, and signal history, nothing else really matters....."Yes! These thoughts are what led me to try my present line stage composed of the AD744 +AD811. The output stage of the AD744 is bypassed - the output for the AD744 is actually taken from the compensation pin. So far as I know, the AD744 happens to be unique in that "feature". The AD811 provides the "beefy" output stage. Sounds really nice, but doesn't get a lot of press (in my mind) because the idea is a few years old and so are the parts. In my mind, the most important improvement to be made in op amp based designs is to use a buffer with the op amp. I think Adcom was really on to something when they produced the 565 preamp. It would be interesting for them to update it with a least higher performance buffers; the LT1010 has a fair amount of distortion and is not really "speedy".
I agree, I have also been very happy with the OPA627+BUF634. I also have found the National LM6321 (I think that's the part number - it's a minidip package)to be a VERY nice unity gain buffer to follow op amps.
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Follow Ups
- Re: 627 is a VFB, unity gain compensated device - mlloyd1 08:03:59 06/26/01 (0)
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