It's all about priorities... ;-)
Created my account some time ago here but did not post until now. Always good to add some substantial info in a first post...
Pete
Thanks for the reply.
From your list it looks like my 9090s are newer and I agree they should have had the upgrade. Seems the 7 after the 82 is year 1977 and 05 is month of May.
Charlie
Most Sansui serial numbers follow a set pattern. The first two digits designate the production line. The third digit represents the year of production. The forth and 5th digits the month of production. The last four digits are a sequential production count. Your 9090s were both built on production line 82 in May of 1977. One was the 746th unit off that line that month and the other was # 1,328 off that line that month.
It's this coding that makes tracking the serial numbers valuable. It provides information on when and how many of a particular model were built. Thanks for participating.
Hi,
One more in today for the collection (will have to sell some soon). Not listened yet but here's the serial number for the DB.
Model,Serial Number,AK User Name
AU-X901,608014879,Skaman