The Bugle (and its variants) is a solid-state phono preamp from Hagerman Audio Labs (formerly Hagerman Technology). It’s often sold either as a fully assembled unit or as a DIY kit. It’s popular among vinyl enthusiasts for being high value, flexible, and very transparent in sound.
*Components may differ from the original values since i adjusted to commercial values.
This preamp is evaluated using an inverse equalization network also designed by Jim Hagerman, which is connected as a load to the preamplifier. Looking at the frequency response curve (green curve), one can notice a fairly flat response, as can the orange curve, which is 20 dB lower than the green one.
See Jim Hagerman explain Phono Equalization
https://youtu.be/M_tfy-4gBaw
