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#systemsthatmatter

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Repaired two of my five broken-and-fragile-but-still-great FG504 Tektronix signal generators. I repaired a third but then it grew a new problem in the output amplifier similar to the problem also shown by a fourth. There are 12 transistors in those output amplifiers and in each case it is a bit of a puzzle to try and understand which one is the cause of the problems.

#Tektronix #79 #SystemsThatMatter

About five years ago I had six working Tektronix FG504 signal generators, most of them quite seriously repaired after I managed to find eight of them, but with only one working as-found. They are fantastic but also fragile (and 40-50 years old): yesterday I was again down to only one working generator: time to start on those postponed repairs.

#Tektronix #79 #SystemsThatMatter