Kinight KG-686 Transistors

[Winky Dink]

I have an unrestored Knight KG-686 RF generator which I’d like to put into service. The only problem I have is that it has TRANSISTORS and GERMANIUM DIODES. Having no experience with these critters, I need to know how much can I rely on these 1970’s transistors and diodes?

In addition to the rest of the routine electronic restoration, should I:
Replace all the transistors?
Remove and test each transistor?
Leave them alone and see how the set works?
And the same questions for the germanium diodes.

The set has ten Motorola NPN transistors in three flavors. This is the information which I have gleaned from various sources:

MPS-6513 (marked 0131/744) osc, E.F., 100KHz osc, audio osc.
MPS-6541 (marked 0142/744) modulator
? ? ? ? ? (marked 0134/712) meter amp, 1 Mhz osc, mixer, audio amp.

The first two are described as general purpose amplifiers and I have data sheets for them. For the third one, all that I have determined is that it’s an NPN and is probably also a general purpose amplifier.

Any advice will be welcome.