The PDP-9 at the RICM uses a bunch of B602 Pulse Amplifiers. One in the Processor Microcode clock circuit is intermittent. The transistors are listed in the Schematic as DEC-6A and DEC-6B. The parts are marked DEC-2894-3A and DEC-2894-2B. Can I substitute 2N2894 parts for these transistors? -- Michael Thompson