Common Mode Noise Filter – Coax +3 Switchcraft 12B Stereo 1/4 Jack - 3 Conductor, panel mount, Vintage Mic Chassis Jack SW12B-1 $1.95 In stock Quantity: 1 Add to Bag Product Details Genuine Switchcraft 12B 1/4 inch, 3 conductor female panel mount - great mic jack for vintage radios (tip is PTT, Ring is Mic Audio) available in singles, packs of 5 Save this product for later Favorite Typical user comment: The filter was quite effective. Was surprised that it actually reduced the noise level more than the signal so S+N/N improved by 1.9 S units. Bill
