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RE: Series Resistor to Increase Preamp Input Impedance?

Posted by Caucasian Blackplate (P) on May 23, 2012 at 22:58:58

In Reply to: Series Resistor to Increase Preamp Input Impedance? posted by harry lime on May 23, 2012 at 15:41:59:

You can add a resistor in series, yes, but you will create a voltage divider with your 2K control, causing other issues (attenuated input). You can also use an input transformer in this manner.

2k is really, really low input impedance for a preamp. The two potentially viable options would be to buffer the sources feeding the preamp, or modifying the control itself in the preamp.

I would be really careful with modifying the preamp, there could be a very good reason that the control has such a low impedance.

On the other hand, adding buffers to your sources might not be so tough.

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