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Eventually, I thought, I'll get a rough idea what the highest and lowest s/ns were.

In the above example, the transformer was made in either 1966 or 1976, week 45.

The first three numbers will be 220 which denotes the manufacturer as Jensen.

The next number is the year of manufacture and the last two numbers will be the week of manufacture.

As people download them, I'm hoping they'll respond to my request that they send me their amp's serial number for this project, and many do.

For a while I also had automated searches running on e Bay for these 14 amp types - whenever one appeared for sale I would contact the seller, asking for the serial number.

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