Tannoy Dual Concentrics: Diaphragm Part Numbers and Production Years

 Model Designation  Production Years  Low Frequency Diaphragm  High Frequency Diaphragm
 Monitor Red 10" (IIILZ)  1958 - 1967  7900 0003  7900 0205
 Monitor Red 12"  "  7900 0002  "
 Monitor Red 15"  "  7900 0001   "
 Monitor Gold 10"  1967-1974  7900 0007   "
 Monitor Gold 12"  "  7900 0006,
or 7900 0005 for paper surround
  "
 Monitor Gold 15"  "  7900 0004   "
 Monitor HPD 10"  1974 - 1979  7900 0010   "
 Monitor HPD 12"  "  7900 0009   "
 Monitor HPD 15" "  7900 0008   "
 DC386  1979 - 1980  7900 0039   "
 DC316   "  7900 0036   "
       

The information above was obtained from http://www.tannoy.com
Note that the HF diaphragm part number is unchanged from 1958 to 1980.

 

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