NEC DB2000 Service Manual page 119

M5-TV0514 BAR64-05 SILICON DIODE D300, D400, D401
(2)
(1)
(2)
(1)
D2 D1
(3)
(3)
High voltage, silicon diode, for frequencies up to 3Ghz
M5-TV0519 B8Y51 SILICON DIODE D303
(2) (1)
(3)
This is a dual tuning diode