I recently repaired an amp with a manufacturing date on the plate on the
back of 2004.
The 4558 op-amp ICs inside had apparent datecodes of 4038.
Do some companies put 4038 instead of 0438 for 38th week of 2004 and same
for 2001 to 2009 ? , what about year 2000?


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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/