I have come across this filter in my junk box and am unable to find much information on it. I think it is a Sinclair unit, but does not appear to be listed in the Sinclair Catalog. I am sure it is a vhf unit but am not sure of the tuning procedures. It follows a Isolator. Is it a LP filter or a 2nd harmonic filter?? It only has one tuning control which is offset from the centre of the small block and appears to be a capacitor similar to those used in Sinclair's notch cavities. Lots of listings on ebay for them, but no tuning instructions or descriptions otherwise. Since I have it, I thought I might as well use it...
How do I tune it?? Thanks Doug
