I took a one semester class on tubes in college, but I don't have the experience you are talking about.
I also tested tubes and replaced them, but never got into actual repair of the circuits except for what I learned in the class.
Question:
How do the newer SMD circuit devices deal with the applications of big devices that the old HV and high ampere gear operated?
Those old HV devices must still be useful and needed even today. What replaced those big tubes and peripheral components
like big capacitors and big output transformers?
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