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.
-
-
-
-
-
-
-
-
-
-
-
Reference to Type J in December 1963 Service Scope