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It appears to be similar to the [[1A1]], | It appears to be similar to the [[1A1]], | ||
which was [[introduced in 1964]]. | which was [[introduced in 1964]]. | ||
The [[547]] training guide, dated December 30th, 1963 mentions "a new dual trace plug-in, the 1A1 (also known as the J). | The [[547]] training guide, dated December 30th, 1963 mentions "a new dual trace plug-in, the 1A1 (also known as the J)." | ||
* [http://w140.com/Tek_Type_J_tentative.pdf Tektronix Type J Tentative Specs (PDF)] | * [http://w140.com/Tek_Type_J_tentative.pdf Tektronix Type J Tentative Specs (PDF)] |