Preamp installed and tested

 The Behringer PP400 arrived.

The unit was a drop-in replacement. There is no hum or other intrusive noise.

I have several 33 1/3 rpm LPs designed for testing audio stereo systems. The unit passes, though I had to turn up the volume quite a bit to here high frequency sweeps up to 10kHz in one instance.

I would like to record one of the albums' tracks through each preamp, and if possible, without a preamp, hence RIAA bypass, and compare them. A Fourier transform might be revealing. 

There was, I believe, a comment in the custom design that the board could be modified for reconfiguration of the RIAA filter. A switch alterable version might be useful in switching between different filters used in different decades.



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