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Best replacment for NE5532 in Phono preamp
Best replacment for NE5532 in Phono preamp
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Old 12th January 2019, 01:58 AM   #41
PRR is offline PRR  United States
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Quote:
Originally Posted by MarcelvdG View Post
According to Wikipedia the Neumann pole is complete nonsense...
IMHO, Wikipedia can be a guide but never The Authority.

Santa Claus is real. The Easter Bunny is real. The Neumann Pole is real. If you wish to believe in it. Don't let facts or logic get in the way.
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Old 12th January 2019, 07:26 AM   #42
ejp is offline ejp  Australia
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You need to read Self on this. Not only does he disprove the 'Neumann pole' by reference to actual Neumann circuits, he also asks the even more relevant question: if Neumann really tried to suppress stuff beyond 50KHz, what exactly are we doing trying to put it back?

NB The original claimant, Allen Wright, provided exactly zero evidence.
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Old 12th January 2019, 07:35 PM   #43
sgrossklass is offline sgrossklass  Germany
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Quote:
Originally Posted by MarcelvdG View Post
According to Wikipedia the Neumann pole is complete nonsense:

RIAA equalization - Wikipedia
That was not the point. I do not particularly care about frequency response accuracy well in the ultrasonic range, as should most other people with a grand total of zero CD-4 quadrophonic records. What I do care about is the associated additional series resistor in the feedback network that (a) makes it easier to drive and (b) also permits use of non-unity-gain-compensated opamps (or being able to ease up on compensation of an external input pair). Nothing more, nothing less. If the resulting pole results in more FR deviation from ideal than you like, eliminating it via some passive RC filtering should be trivial.

Last edited by sgrossklass; 12th January 2019 at 07:38 PM.
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Old 12th January 2019, 07:42 PM   #44
dreamth is online now dreamth  United Kingdom
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Originally Posted by sgrossklass View Post
What I do care about is the associated additional series resistor in the feedback network that (a) makes it easier to drive and (b) also permits use of non-unity-gain-compensated opamps (or being able to ease up on compensation of an external input pair)
That series resistor is also improving the phase response linearity in 10...20khz or even higher range with unity gain compensated op-amps and also with the "universal op-amp "model in LtSpice.
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