Amp/Preamp Asylum

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Original Message

It helps, but mainly the voltage input

Posted by Ralph on May 31, 2017 at 11:09:04:
is what you are looking for.

In the case of the RIAA network, it can be done differentially so you don't need dual matched resistors there either (although you do want them to be correct for the right curve of course).

For example in our preamp the EQ network calls for dual 110K resistors in one location but they can be replaced by a single 220K resistor. In this way if one half of the balanced circuit does not perform as well as the other half, the EQ is unaffected.

The prior example is also a bit of myth-busting about the idea that you need twice as many parts as single ended; obviously you don't; our EQ network has the same number of parts as a single-ended embodiment, despite being balanced differential.