2n3393 transitor equivalent?

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Recommended replacements: BC168/183/238/548

As per Japanese International Transistor Comparison Tables - Tech Publications PTE.Ltd.
 
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    neazoi

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Recommended replacements: BC168/183/238/548
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None of these has the 500 mA current rating to replace 2N3393. You better refer to the profound suggestion by mister_rf.
 
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    neazoi

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It is to be used in an analogue oscilloscope vertical and horizontal amplifier sections and also trigger sections. If a faster transistor is to be used I MAY be able to make this a little bit faster oscilloscope than 5MHz.
 

In this case, you should check the actual voltage and current rating required by the respective circuit and try a suitable faster transistor. Speed is a matter of all circuit parameters, not only transistor fT and capacitances. Furthermore placing a high speed transistor in a circuit not prepared for it may bring up oscillations.
 
changing the 2N3393 transistor doesn’t help to much
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I agree. The bandwidth limitation would be mainly located in the output amplifier that has to be possibly redesigned for a profound improvement. As a first step, you would want to get an overview of the present circuit's behaviour, either by a simulation, or even better, by a measurement.
 

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