1974 Brain Box saves the day.

Mike69cuda said
Lots of good work on this. Has anyone examined a failed box to see what part actually failed? It appears that we are focused on the power transistor as the failure cause. I agree that it is a likely culprit, but do we have any evidence? My average blindfolded with a shotgun isn’t all that good....
Click to expand...

This Standard Product LX100 with the TO220 internal transistor failed (china made) replaced with same and is working fine now.

Failed after 1 year, the picture of the TO220 transistor here looks fine, no black smoke or heat damage.

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