Thanks to Tony G4WIF for alerting me to this amazing (and free!) e-book by QRP Master Builder Chuck Adams K7QO:
https://www.k7qo.com/lab.pdf
There is a lot of wisdom and tribal knowledge in that .pdf.
Thanks Chuck.
Chuck Adams K7QO’s AMAZING Lab Notebook
!!!!Great job!!!! many good ideas, tank you very much. Joan EA3AED
Wow!!!! 73, John/N6VTS
Wow!!! Tank you very much. Carlos. PY3ZCA. 73s.
Thank for good info. VU3JTA 73