Is the KTR-905 Comm a direct replacement for the KTR-900A?
Yes, but only if it P/N 064-1009-02 or -03. The harness/connector on the -02/03 KTR-905 is the same but it is physically different than the KTR-900A. The KTR-905 is smaller than the KTR-900A. Therefore, a new rack needs to be installed for the KTR-905 replacement. In addition, the KTR-900A and KTR-905 -02/03 must be used with either KFS-590A or KFS-590B controls. The KTR-905 -00 and -01 must be used with the KFS-590B as it requires parallel BCD tuning.