OpAmp blind test: Burson, ADA4627, NE5534

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#202
profiguy said:
For fet based op amps, the AD8066 approaches discrete fet circuitry sonics. On paper it doesn't look as good, but listening to music there's a difference. The main drawback with these chips is the 12V rail limit and they also need very careful decoupling. Their slew rate is in the video range, far faster than anything commonly used for audio. They're also a rail to rail based design, which has its pluses and minuses. They only come in an SMD package. They sound fantastic thoug
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Yes I build once Output stage with AD8066. I can agree with most. But they are slight go to overhaeating with stated +-12V, without heatsink. SMD version of Double OP inside... I have had to lower down the PS voltages to +-8V. Probably they can run stted PS in DIP and AD8065 single version wuth smal heatsink on top....
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#204
thermionic said:
If you want to give credit to the firm for using 2N3055s, just remember that they are driving these trademarked transformers,
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Yes, great Neve design. Nagra has also som very interesting discrete circuits before line transformers too. Check in older models. Exeptional sound.
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BTW one brand from France I think making diskrete OP amps - but under " high-end audio radar".
https://www.soundskulptor.com/en/
The have few diskrete OP amps in kit gorm. BUT they housed for bigger also standard socket. This is not conviniant for audiophiles to "swap" 🙁
Diskrete and available parts are used easy to find.
Soundscupltor published scematics for these OPs, but they not remain in new site 🙁
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They have just 2 OP amps now in KIT form
https://www.soundskulptor.com/en/ac...tml#/1-kit_or_asm-kit/16-sk25_99-configurable
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Their OP amps are tested and measured by some gys from Germany in the lab and they perfprmed very well
 
#205
I'd like to take this opportunity to correct what I wrote in post 141: Rupert Neve was not involved in the development of the 5532/34. It is a myth that has developed over the years and this post, made by someone who was engineering director for Neve at the time, puts the record straight. I think I first heard the myth about 25 years back and feel somewhat embarrassed for parroting it here... I believe I was pretty much right with the other points that I made, namely that the BBC were happy to accept the newer version opamps that used the 5534, and that some of the most desirable Neve consoles such as the 8078 and Montserrat ones contain the 5534.



[if any mods want to correct my previous post, please do)

NB - I managed to pick up a handful of Philips-branded 5532s this week. I imagine that they are the same as the Signetics ones, right? It's many years back, but when I tested some Ti vs Signetics 5532s I seem to recall that the Signetics part edged the Ti ones very slightly (as in about 0.5dB THD+N). Unlike my correction above, I do not think this is an urban myth!
 
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