Corona Electric TF10A
The Corona Electric TF10A is a plugin for 500series scopes designed to measure a transistor's transit frequency as a function of collector current.
Key Specifications
Collector current  100 μA/Div to 50 mA/Div, 1−2−5 

Transit frequency  10 MHz/Div to 100 MHz/Div in four steps 
Collector voltage  ±1 to 15 V (variable) 
See Also
Pictures

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