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Originally Posted by Esteban
Yes... but suspect the 3130 is more sensitive. If not, why they has been designed the Zahori at the time there are many more modern ICs, with less problem of offset?
Redesign the Zahori with low noise figure demands also film resistor resistance 1%.
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The main difference I can see between the CA3130 and the CA3140 is the input current and the equivalent input noise voltage.
CA3130 has Ii = 5pA @ 15V and 2pA @ 5V, and en = 23uV.
CA3140 has Ii = 10pA, and en = 48uV.
Not sure whether this would make a significant difference in this application. When you're talking about pA, there are plenty of other sources of interference to swamp these minute values of current.