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PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

Need to quiet down old mixer w/LM301s
Need to quiet down old mixer w/LM301s
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Old 11th June 2010, 05:35 PM   #21
Th3 uN1Qu3 is offline Th3 uN1Qu3  Romania
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Quote:
Originally Posted by jean-paul View Post
That is not entirely true as a new mixer will have mediocre opamps too.

Just don't expect real good opamps in mixers.
Well i don't need "real good opamps", the ones it has inside sound just fine as far as music is concerned. I just want less hissing on the mike inputs.
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Old 11th June 2010, 05:37 PM   #22
jean-paul is offline jean-paul  Netherlands
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Just as I said: you need real good opamps ( which will hiss less than the current ones). Also metalfilm resistors are recommended.

Although it's an interesting project ( at least for educational purposes) I would only start when I would have a good use for the mixer.
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Last edited by jean-paul; 11th June 2010 at 05:40 PM.
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Old 11th June 2010, 05:38 PM   #23
Th3 uN1Qu3 is offline Th3 uN1Qu3  Romania
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Maybe i just need better mikes, ones that don't need the trim turned all the way up. I'll inspect that later on... First thing first, i'll get all channels working and add phantom power. This should greatly expand my selection of mikes.
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Old 21st December 2017, 01:03 PM   #24
Shelah is offline Shelah  Zambia
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is there a recent replacement for k157ud2 opamp, i have an old eq that uses them
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Old 21st December 2017, 08:17 PM   #25
GeorgK is offline GeorgK  Austria
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This is a russian type, right?
If you cannot find an exact replacement you could make a small adapter board and use a standard dual OPV. You probably also omit the compensation caps then (if used).
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