![]() Therefore, a good working understanding of transistor specifications is important. Incorrect or poorly matched parts can lead to excessive distortion, heat or premature failure. Transistor matching and substitution are generally poorly understood and I’ve lost count of the number of pieces I’ve repaired where the fault has related to incorrect transistors, rather than dead transistors. Substitute in the wrong type and the circuit won’t work, or worse still, may catastrophically fail. They all serve the same role, but each type is uniquely tailored to a specific job and use case. You can think of transistors as being like spark plugs or tyres. There are thousands of different types, sizes and varieties of transistors. Look at case # 19 in the Hall of Shame for example to see how badly some who should know better can get this wrong. Resolving transistor failures is a very common part of my work here at Liquid Audio and getting this part right, from a technical perspective, sets good repairers apart from bad. Transistor failures, in the form of noisy or drifty devices, dead shorts or open devices, are a common phenomenon in old and new gear. These details are unfortunately where many go wrong. This allows good repairers to develop a knowledgebase of what transistors can be used where and why and keep stock of a wide range of premium substitutes. The devil is in the detail and part of the art of repairing electronics lies in understanding these aspects and this means knowing what replacement parts to use, where and when, and if these parts aren’t available, how to select the most appropriate substitutes. ![]() 5 Related Yes, in almost all cases transistors can be replaced.
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