J

The Tektronix Type J is a 35 MHz dual-trace plug-in for 500-series scopes which never went into production.

The Type J's tentative announcement was in 1963. It appears to be similar to the 1A1, which was introduced in 1964.

• Tektronix Type J Tentative Specs (PDF)

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  Reference to Type J in December 1963 Service Scope