Le Pacific JFET Phono Preamp for MM and MC Cartridges


Posted on Feb 6, 2014

This is my DIY build of the Boozhound Laboratories JFET Phono Preampifier, but on a stripboard. The BHL preamp is based heavily on the Le Pacific RIAA phono preamplifier circuit shown below for reference. This is a strip board construction using brown polypropylene caps from the local electronics store. The large electrolytic capacitor is 10, 000u


Le Pacific JFET Phono Preamp for MM and MC Cartridges
Click here to download the full size of the above Circuit.

F fed by a 1 ohm resistor. Wire wrap wire is used as hook-up wire. Silver based solder, gold RCAs and all installed in an embossed gold chocolates box. Photographs 1 through 3. I`ve now built a number of these simple JFET phono preamplifiers. Photograph 4 below shows another of my DIY JFET RIAA Phono Preamp builds. The equalization circuit is also built on a stripboard and fit into a nice looking Hammond extruded aluminum chassis with a black anodized finish (Photograph 5). I also like to use Moving Coil (MC) cartridges with my turntable. MC cartridges have a much lower output compared to Moving Magnet (MM) cartridges. MC cartridges typically have an output of less than 1 mV, while the output level of MM cartridges is typically between 2. 5 and 7 mV. Therefore you will need some additional gain if you would like to use an MC cartridge with the Le Pacific Boozhound Labs phono preamp kit. The additional gain can be achieved by using passive phono step-up transformers or you can use an active circuit like the Le Pacific PrePre for MC Cartridges shown below in Figure 2. The Le Pacific MC PrePre circuit is placed immediately before your phono preamplifier. The MC preamp circuit is ultra simple to construct and like the Le Pacific can be easily built onto a protoboard. I`ve built a number of the LePacific MC PrePre circuits and have used them in front of both the Le Pacific preamp and the Boozhound Labs phono preamp kit. The...




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