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RE: That what my guess in that it was for spike suppression.

If you perform a Fourier analysis on the rectified output (the rectifiers perform a non-linear transformation of the mains AC 60Hz) you will see that there are many harmonics of 120Hz that need to be filtered. Also, HF noise from the AC mains (do a spectrum analysis of your incoming AC, it will not be pure 60Hz) can couple through parasitic capacitance (interwinding capacitance?). Also the voltage spikes generated by the choke if not snubbed will produce HF harmonics of the 120Hz fundamental. While the best of human ears can't hear past 20kHz, ultrasonic noise can and will degrade audio signals in ways that are unpleasant to the listening experience.


"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln


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