Any "good" sounding LM1458 op amps?
Any "good" sounding LM1458 op amps?... |
Music Man Amps Discussion Forum » Solid State Devices & Substitutions » Any "good" sounding LM1458 op amps?
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Mike H |
Anyone found a "good" sounding LM1458 or "good" sounding replacement for the LM1458 op amp? |
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Mike H |
In response to my own post, here's what I've found. I tried four different op amps in lieu of the LM1458. I tried a JRC4558, NE5532, TL072, & OPA2228. All were new parts. I have a 112 RP 65 with 7 ops amps. The phaser uses 3, pretty much. All of the op amps were functional in the amp, except in the phase inverter position, IC-7 on my amp. The newer faster chips created funky bad sounds in IC-7. Here's how they did otherwise. |
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Mike H |
I used 2N6488 driver transistors. Could I be hearing slight oscilation from these transistors? |
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Steve Kennedy (admin) |
What are the symptoms that would lead you to believe that your driver transistors are oscillating? You might have a leaky or open cap in the output stage that is responsible for your degraded audio quality. |
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Mike H |
Thanks for the follow-up, but ignore that last post! My amp's up and running, sounding great! |
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Graham Heath (gheath) Username: gheath Registered: 03-2009 |
Hi Mike |