I have a vintage Yaesu FT-600 and would like to use it on my boat as backup to an even older SEA 222 SSB for WEFAX and possibly SailMail. I am looking to upgrade the stock 10 ppm reference oscillator to a 2 ppm TCXO-4. I am also looking for a YF-112A AM filter. Some say this search takes on mythological proportions... like finding a Yeti or Bigfoot. So, if anyone out there has or knows where I might find a TCXO-4 oscillator or YF-112A AM filter please let me know. Many thanks in advance.