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Old 19th April 2006, 12:34 PM   #1
Lyra is offline Lyra  Norway
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Question OP-amp replacement...

I've got an (car)amp and this are using the "old" HA4741 op-amp in the input/ filter stage.
The sound from this amp is so and so...

Considering the "741-family" not very good for audio-use, I want to replace theese op-amps...

I was thinking about MC33079. I can get theese from SGS-Thomson, and ON-semi, would the manufacturer have an inpact on the sound ?

Is there any other Quad op-amp's available that would be better than the MC33079 ??

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Old 19th April 2006, 02:51 PM   #2
Leolabs is offline Leolabs  Malaysia
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If you are looking for a cheap and cheerful quad opamp,consider about TLO74
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Old 19th April 2006, 02:55 PM   #3
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Look at OPA 4134...
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Old 19th April 2006, 04:28 PM   #4
Ryssen is offline Ryssen  Sweden
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Look at OPA 4134...
I agree...
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Old 19th April 2006, 11:57 PM   #5
jaycee is offline jaycee  United Kingdom
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Bear in mind if it's using a quad 741, sticking a fast opamp like the OPA4134 in there could be asking for trouble...

I'd stick with the TL074
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Old 20th April 2006, 04:52 AM   #6
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The HA4741 is a 3.5MHz chip with 1.6V/us slew so its no quad 741.

The TL074 would not really be an improvement
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Old 20th April 2006, 09:52 AM   #7
djk is offline djk
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I've replaced the 4741s with the TL074s, they do sound cleaner, but a bit thin on the low end.

"Look at OPA 4134..."

No longer available in a DIP.

National Semiconductor equivalent of a quad 5532 in 14 pin DIP (LM837), in stock at DigiKey.

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