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Old 8th October 2001, 07:54 AM   #1
f4ier is offline f4ier  Australia
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Hello everyone,

I built a stereo preamp kit from http://www.dse.com.au which uses a Baxandal circuit block around an LM833 opamp for the tone controls (if memory serves me well). With the tone controls centered, I noticed that midbass was noticeably softer -- like the preamp lacked some midbass "bite" -- than when the whole preamp kit was removed from the signal path. Bypassing the whole preamp circuit brings back the sound to "neutral." Just recently I bought an LM833 opamp-based subwoofer processor circuit for my Shiva-based sub and noticed that it too had a rather soft midbass character.

I was wondering if anyone has noticed the same LM833 "characteristic" as I have...

TIA

Isaac
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Old 8th October 2001, 03:29 PM   #2
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Replace the LM833 with NE5532 and with LF353 alternately. Please report whether in your circuit these opamps too have a slightly laid back mid.
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Old 9th October 2001, 03:40 PM   #3
f4ier is offline f4ier  Australia
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Sam, thanks for the reply

Is the NE5532 pin-for-pin equivalent with the LM833? Lastly, are there any sonic differences between the NE5532 and NE5534? It looks like the NE5532 is only available through (more) specialised electronics stores.

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Old 9th October 2001, 06:00 PM   #4
mlloyd1 is offline mlloyd1  United States
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NE5534 is a SINGLE that IS NOT compensated for unity gain.
NE5532 is a DUAL unit that IS stable at unity gain.
So, this is not a drop in replacement!
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Old 9th October 2001, 08:21 PM   #5
paulb is offline paulb  Canada
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But, LM833, LF353 and NE5532 should be directly interchangeable.
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Old 12th October 2001, 02:17 PM   #6
f4ier is offline f4ier  Australia
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Well, it really was the LM833 that sounded "odd." TL072 (or LF353) opamps are readily available here in our town, so I tried one with my subwoofer processor circuit and the midbass response came to life! Midbass doesn't sound thin anymore

I found a distributor of NE5532 opamps several towns away at http://www.altronics.com.au, I wonder how it would sound with the circuit.

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