[R-390] Thanks and need a 4kHz filter

[FISCH, MICHAEL]

Dear All:
 
I finally got my R-390a up and running.  It looks like I could spend a long time fixing more stuff  (C551, AGC, better audio...), but I want to use it!  I want to thank all of you for your help, comments and all the great stuff on the web.
 
The 4kHz filter in my IF is bad, and I'm not a watch maker so I really don't want to start to fix it and never get around to it.  Is there a good source for these filters?  Does anybody have one for sale...?  Also are the filters on American Trans-coil IFs generally good (i.e should I buy one for spare filters)?
 
Thanks again
Mike