Barker Williamson FC-30A is correct choose for most of linear amplifiers. Only one available any more.
Mirage/KLM KP-1/70cm 430-450 MHz Preamplifier
Mirage/KLM KP-2/70cm 430-450 MHz Preamplifier
Variable Capacitor 4,5 KV, 16-310 pF
High Power Omron Relay
Coaxial Relay PCB to N CX-140D