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help please about equivalent transistor

hubi

Feb 21, 2017
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Feb 21, 2017
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hyall
am trying to repair an amplifier.
amongst other compnents there are 2 transistors "BC174B" that i need to replace but i can't find any transistor of this sort to buy so i looked around and found datasheet of "BC546A" that looks quit like the datasheet of the BC174B but i need confirmation from people who are more experienced than me and i don wanna fry the amplifier. my question is can anybody help to confirme that these 2 transistors are really equivalents? and help how to tell when it comes to the connectors i mean are they really the same or do i have to inverse or something? thanx a lot for your help
 

duke37

Jan 9, 2011
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Welcome hubi

The transitors seem to be very similar and many other transistors are available.
npn 65V 100mA Hfe >110. 100 or 150MHz
They are both e, b, c. I have not checked if these are the same way round.
I doubt if a faulty transistor could damage the amplifier but this will depend on the circuit.
 

Audioguru

Sep 24, 2016
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Sep 24, 2016
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The "A" transistor has low gain and might fail when replacing the "B" transistor that has at least double the gain.
A BC546B transistor will make a good replacement.
 

hubi

Feb 21, 2017
2
Joined
Feb 21, 2017
Messages
2
Welcome hubi

The transitors seem to be very similar and many other transistors are available.
npn 65V 100mA Hfe >110. 100 or 150MHz
They are both e, b, c. I have not checked if these are the same way round.
I doubt if a faulty transistor could damage the amplifier but this will depend on the circuit.
thanx Duke for the answer,
 
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