|2 x HN3A51F + 1 x HN3C51F dual transistors for the Ultra-LD Mk.4 Power Amplifier module|
A pack of three dual transistors:
2 x HN3A51F dual PNP transistors, 120V, 100mA in an SM6 package
1 x HN3C51F dual NPN transistors, 120V, 100mA in an SM6 package
These three transistors are required to build one Ultra-LD Mk.4 module.
These products have been discontinued and are now hard to get.