I mean, in my question, there are electronic components that are not used now, such as the vacuum valve due to the presence of an alternative and better element. Is it preferable to give information about the unused element?
It's not fully clear what you mean by your question. Do you have a setup in which you haven't used all components and you are considering discussing them anyway or what do you mean?
A vacuum valve in general is not something I would consider an electronic component unless there is something special about it.
Basim,
I sense that the word 'loaned' in your question may not be the best choice for your question.
In general, there is no harm in studying older devices - and thermionic valves (for example) are an ingenious solution to the problem of signal amplification and rectification.
We would do well to not forget their workings.
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