Erno Borbely designed a FET phono stage that was later adapted for tubes by Joe Tritschler (aufioXpress Jan 2010). I had two PCBs made with his circuit, but with a couple of mods including the ability to add Lundahl step-up transformers and switch between MM & MC cartridges.
I put the phono stage into one of my chassis, along with a modified Erhard PAS Akido line stage, a HV regulator, and an input relay PCB that I had made. The input PCB automatically shorts out unused inputs.
Also included is an IR remote-controlled volume control with mute function. An external power supply provides 12V and 358V that will be regulated to 300V for the two gain PCBs.
I put the phono stage into one of my chassis, along with a modified Erhard PAS Akido line stage, a HV regulator, and an input relay PCB that I had made. The input PCB automatically shorts out unused inputs.
Also included is an IR remote-controlled volume control with mute function. An external power supply provides 12V and 358V that will be regulated to 300V for the two gain PCBs.
