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Charles,
All the chassis' between the TRK12 and TRK120 are mechanically the same. The main electrical differences are the TRK12 has an eye tube in the radio while the TRK120 does not, the 12 has DC restoration while the 120 does not, and the focus control was moved from the back on the 12 to the side on the 120. They were all AM sound/441 line originally although no changes were ever made or required for 525 operation.
I think finding a bad cabinet set as you mentioned would be the best route to make a complete set. Purchasing the missing components individually would be to expensive.
Darryl
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