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RE: 4P1L preamp DIY

Posted by GeorgePope on March 21, 2017 at 04:41:08:
The point I am making is that a Coleman reg presents a high impedence and hence a very large degree of isolation from the downstream PSU circuitry . It feeds the filament with a ring of two CCS one side and a gyrator/buffer the other . By using choke input , the measured noise at the filament pins drops by an insignificant amount . In terms of harmonics measured on the FFT , I can't see a difference in comparison to cap or resistor input but there is an unexplained improvement in sonics . Maybe I need better equipment to measure this but as far as I'm concerned , it's not worth it

George