Roy: I have a ICM 6M to 10M converter, FCV-2 Model 50. When I bought it at a flea market it I was told it was a 10M to 2M converter but then found out the truth. And since my NC-155 already has 6M it was of no interest to me. It uses a 6U8 and 6BQ7A. The nearly bug-eaten instructions have a date on the schematic of 11/6/61. Wayne