Hello all. I finally located and received Z501 and now all I need to install the Xtal filter in my homebrewed "hollow state" Longwave CW receiver is the matching IF transformer. THis is Transformer T-208 and sits next to the 3rd Mixer in the R-390A RF deck. Anybody have one at a reasonable price? Please uote "shipped" price to 95348 (Merced California). 73 de Phil KO6BB