reverse RIAA filter, made in USA using premium 1% resistor and WIMA 2.5% capacitors.
With this you can use a CD player or other line level input and run it thru the filter, and then into your phono preamp,
to check your RIAA linearity and make tests without having to deal with a turntable and cartridge, eliminate any ground loop problems.
FREE SHIPPING in USA   fully assembled, ready to use

Direct connection to RCA sockets.
No wires from the PCB to the connectors = Minimal noise / Radiation
Stereo High Quality Passive inverse RIAA filter 
 RCA Input / Output connector Soldered for minimum noise and radiation
matched Capacitors for maximum L & R channel balance
for testing RIAA Stage Pre-Amp & make Aux Signal to Phono 
With This Small PCB You Can test Phono Riaa input stage
also you can play with this item CD,AUX,etc. with RCA Phono Inputs
On Board MM, MC Level Switch -40dB / -60dB output