I use SPICE whenever possible to analyze circuits I'm planning to construct. This evening I combined an inverse RIAA filter with the RCA phono preamp circuit. The result is a frequency response plot that's essentially flat over much of the audio spectrum, but there's a pronounced high end rolloff. At 20KHz, amplitude is down 3dB. I'm pretty sure this isn't related to networks in the preamp, so maybe it's the Miller effect at the 12AX7s. Anyone here ever used an inverse RIAA to measure their phono pre?
This post is made possible by the generous support of people like you and our sponsors:
Topic - RCA Phono Preamp Rolloff? - Triode_Kingdom 20:31:20 07/20/17 (8)
- RE: RCA Phono Preamp Rolloff? - SteveBrown 23:13:26 07/22/17 (0)
- RE: RCA Phono Preamp Rolloff? - Eli Duttman 22:35:31 07/20/17 (4)
- Eli - Questions Regarding Values - Triode_Kingdom 12:34:04 07/22/17 (2)
- RE: Eli - Questions Regarding Values - Eli Duttman 13:21:39 07/22/17 (1)
- RE: Eli - Questions Regarding Values - Triode_Kingdom 14:53:43 07/22/17 (0)
- Found It... - Triode_Kingdom 23:38:23 07/20/17 (0)
- RE: RCA Phono Preamp Rolloff? - Caucasian Blackplate 22:30:28 07/20/17 (0)
- RE: RCA Phono Preamp Rolloff? - FenderLover 21:27:03 07/20/17 (0)