These cw filters are all fully tested and perform perfectly. They are designed for the cw operator who likes a slightly lower pitched sidetone than the stock 750hz pitch sidetone. Priced as listed. Add $5 shipping (CONUS) per order. 1. Inrad #753 400hz 9MHz IF $85 2. Ten-Tec #221 250hz 9MHz IF – this filter is VERY rare - $90 73, Barry N1EU