[goat1981]

Hey guys,

I just got done taking voltage readings of all the IF stage transistors, the Video Amp transistor, and the Video Output transistor and found some interesting results (especially the video out transistor...)

Here are the readings in order of what's specified on SAMS and what I read with my multimeter.

Supply Voltages:
-5v -- reads -4.4v
+11v -- reads +8.2v
-11v -- reads -8.8v

First IF Transistor (X1)
Base -- 1.5v -- reads 0.85v
Collector -- 0v -- reads 0v
Emitter -- 2v -- reads 1.22v

Second IF Transistor (X2)
Base -- 2.0v -- reads 1.27v
Collector -- 0v -- reads 0v
Emitter -- 2.2v -- reads 1.57v

Third IF Transistor (X3)
Base -- 8.5v -- reads 6.62v
Collector -- 0v -- reads 0v
Emitter -- 8.6v -- reads 6.77v

Fourth IF Transistor (X4)
Base -- 8.5v -- reads 6.37v
Collector -- 0v -- reads 0v
Emitter -- 8.6v -- reads 6.58v

Video Amp Transistor (X5)
Base -- 10v -- reads 7.28v
Collector -- 4v -- reads 2.84v
Emitter -- 9v -- reads 7.5v

Video Output Transistor (X6) -- here is where the problem is...
Base -- 9v -- reads 6.65v
Collector -- 9.5v -- reads -8.66v (!)
Emitter -- 0.5v -- reads 8.11v (!)

Could it be a bad Video Output transistor? I haven't replaced any of the diodes, which are the original 1N60A germanium diodes -- these seem pretty common and I can replace them if you think it'll help.

What do you guys think about these readings? If you missed the schematic, I included it in a previous post.

Thanks again for your help!