Replacement for LM318H Op AMP in BGW AMP 750 A/B - diyAudio
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Old 29th August 2009, 02:35 PM   #1
qsa is offline qsa  Germany
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Default Replacement for LM318H Op AMP in BGW AMP 750 A/B

Hello is there replacement for LM318H possibile ?

Want improve sound in mid and high

How about LME49710 or NE 5534 as replacement

I think amplifier can better sounding with new op amp LME49710
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Old 29th August 2009, 04:13 PM   #2
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LME49710HA about $8.30 from DK
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Old 29th August 2009, 05:39 PM   #3
jcx is offline jcx  United States
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the circuit makes a difference - the 318 was sometimes used with a discrete fet input bypassing its inupt diff pair- not many pin compatiable drop-ins for that cirucit
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Old 29th August 2009, 11:41 PM   #4
anatech is offline anatech  Canada
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Keep the LM318. It's the best op amp for that circuit. There are other things you should be paying attention to, like the DC offset adjustment. Output transistor matching, in fact, try some of the newer outputs.

In feed forward, the LM318 is capable of slewing at 70 V/uS. That's faster than what you are looking at as replacements.

"Just because you can, doesn't mean you should" my Wife
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Old 30th May 2012, 11:33 AM   #5
Lenin21 is offline Lenin21  United Kingdom
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Smile LM318 - Good, but not the best...

Use one of Linear technology's higher spec versions of the LM318/LM118 - the LT318A/LT118A.

A drop-in replacement, lower noise, better PSRR.
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Old 1st June 2012, 01:40 PM   #6
djk is offline djk
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Fix the coupling caps in the BGW first, the opamp is trivial by comparison.
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Old 2nd June 2012, 06:44 PM   #7
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Originally Posted by djk View Post
Fix the coupling caps in the BGW first, the opamp is trivial by comparison.

I couldn't agree more with this statement.

Improving C1 (10uF electrolytic) and C3 (50uF electrolytic) quality might improve things a lot more than swapping the 318.
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