But the strange is its date of manufacture, indicated !!!
I agree with "geppo", ... "The four digit number is probably the date code, i.e. manufactured in the 43rd week of 2017" ...
yes I agree with thatIf it's indeed a date, it shouldn't be strange, as Spectral have said these are custom semiconductors, similar to those we discussed years ago in the 30SV preamp. It sounds like they took some exceptional devices and customized them for even better specs...
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