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Mark Levinson No23 repair help
Mark Levinson No23 repair help
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Old 13th January 2021, 07:43 PM   #351
Handel is offline Handel  Netherlands
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Join Date: Jan 2004
Location: Veldhoven
Quote:
Originally Posted by Hans Polak View Post
Hi Hannu,
Look here for limiting behaviour at 10KHz.
Mark Levinson No23 repair help

Hans
Ok. There the current does not drop immediately when hitting to the protection like at low frequency but stays at the same level the whole positive (or negative ) side. Different behavior.
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Old 14th January 2021, 08:26 AM   #352
Hans Polak is offline Hans Polak  Netherlands
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Join Date: Mar 2005
Location: Blaricum
Yes it does behave the same, see the short spike at the left.
Current goes up, gets interrupted by the protection and goes down.
It goes up again to a stable level when input voltage rises to 3.1V.
The difference with the 800Hz image is that the used input voltage went up to only 70mV.

Hans
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Old 15th January 2021, 07:01 PM   #353
Handel is offline Handel  Netherlands
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Join Date: Jan 2004
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That is true. I forgot that you have 3.1V in the input.

I noticed that for some reason in the right amp the output transistors at negative side are not well balanced in idle anymore. One of the voltage over 0.22ohm resistors is 20mV as the others have 9-10mV. Do I kill this transistor if I make the same multimeter test? How is it possible that I have now so different results? I don't think I have made errors in measurements.
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Old 15th January 2021, 09:41 PM   #354
Hans Polak is offline Hans Polak  Netherlands
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It is not an optimal match, but as the current increases the 0.22R resistors will reduce the differences, so donít be afraid this single transistor will be killed while doing the multi meter test.

Hans
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Old 25th February 2021, 01:33 PM   #355
Handel is offline Handel  Netherlands
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Join Date: Jan 2004
Location: Veldhoven
No, I have schematic only from No.23.
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