Sherwood Engineering Incorporated Sherwood Engineering Incorporated
1268 South Ogden Street Denver, Colorado 80210 USA
email     Phone:
303-722-2257     FAX: 303-744-8876    
9 a.m. - 5 p.m. MST Monday - Friday

Sherwood Engineering Inc. Home Page Cooling Kits Drake R4-C Catalogues Filters Additional Products

Collins 455 kHz Mechanical Filters
455 kHz Crystal Filters

Our purchase of new old stock Collins mechanical filters is almost exhausted. These are the classic "bathtub" cased filters that are typically black with blue markings. We have boards to adapt them to the JRC NRD 515, 525, 535 and the Racal 6790GM. Remaining bandwidths available: 6 kHz & 5 kHz only.

We have a limited supply of both bandwidths currently in stock --

These are a 'one time' purchase. Make your selection while they last.

Shipping Information


Of course, experimenters can adapt these fine filters to other radios --

Shipping Information

Large 455 kHz Crystal Filters

This special purchase is allowing us to offer these filters at a fraction of their normal cost. Don't miss out.

Shipping Information


Sherwood Engineering Incorporated Sherwood Engineering Incorporated
1268 South Ogden Street Denver, Colorado 80210 USA
email     Phone:
303-722-2257     FAX: 303-744-8876    
9 a.m. - 5 p.m. MST Monday - Friday

Updated 1 December 2008