After I bought some Motorola MPN3401 diodes from Debco Electronics, I mentioned their availability in Homing In for April 1995. A reader wrote to me after publication to say that Debco was astonished at the response. They sell RF parts by mail and are often at southern California swap meets, too. Jim says that the margin on small quantities of RF parts is so low that it's not cost-effective for him to return calls. All Electronics , PO Box 567, Van Nuys, CA 91408.
Locals can save shipping charges by picking up orders at that location during normal business hours.
In addition, ByteMark sells a Windows-based program for calculating the turns for coils on various Amidon cores. Unfortunately the Philmore Web site does not have a complete product list, but it does include a list of local distributors of these parts. The oscillator would not start properly. I tried 6 different ones and they all acted the same. I put in an old Fairchild CD4001B Quad-NOR and now it works with no problem.