[Amps] Matching devices

[GGLL <nagato@arnet.com.ar>]

   Hello to the list, how closer/optimum would be fine, to match a pair 
or more active devices, being either tubes or transistors, are there 
some guidelines to achieve that?.
Is that test made at low level, or high level, or along a whole 
operating line?. At fixed bias DC points or with a variable AC drive?.

Thanks in advance
Best regards
Guillermo - LU8EYW.
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