I forgot all about the GSB-1. thanks for covering it. 73 Rob K5UJ On Sun, May 10, 2015 at 9:50 PM, Richard Knoppow <1oldlens1 at ix.netcom.com> wrote: > The TMC adaptors definitely work for 455Khz. I think if you use manual > tuning you can also use them for 500Khz, for instance for the 51J/R-388. I > am not entirely sure of this.