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~ 1948 Supro Cleanup ~ Page 2; ELECTRONICS: |
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More pics and text of work on this Supro will be added as time allows a break to do so. |
Here we have a very interesting demonstration. Standardized potentiometer codes were not common until 1947. On this Steel, as shown below, one pot has the 1947 code '304' (Stackpole Company), '7' (1947), and '07' (the 7th week ...of 1947). The numeral '7' could be any year between 1947 and 2007; But we have the other pre-code pot to see that the coded pot is identical and thus reasonably assuring that the coded pot is 1947. The code 220-2 is a proprietary number, either the manufacturer Stackpole's part model number or a jobber's model or part number, stamped-on by Stackpole. |
Here we see a pre-code proprietary number, either the manufacturer Stackpole's part model number or a jobber's model or part number, rubber stamped on by Stackpole, or a distributor or a jobber. |
