Unless you want to learn how to find equivalent replacement devices and you have some time on your hands, if you can find the exact device you’re trying to replace… at a modern distributor or store… at a price you’re willing to pay… then just do that. Going straight for a same-to-same, identical replacementĭoes one of the large electronics distributors still carry the exact device we’re looking for? At a price we’re willing to pay? Narrowing those matches to the best choices for us.Searching through all known transistors for matches.Narrowing those specs to just the ones important in our application.Fill in those blanks with the specifications of the original transistor.Making a list of specifications used to find the right transistor.narrow the matching results to the best results.find (by searching) the reputable online distributors for available, cheap transistor models that will perform the same or better.Identify the important specifications of the original device.The way to find devices that are equivalent and available is to If not, we need to know which devices are equivalent, as per the use or application in our particular circuit. We want to find a reputable, inexpensive, probably modern equivalent device that we can purchase online, have delivered inexpensively, and which operates at least as well as the original device does/did.īefore we dig into all the details and the process of finding an equivalent replacement, can we find this exact device from a reputable online distributor at a price we’re OK with? If so, buy it and forget about finding an equivalent replacement device.We have a transistor, a particular device, used in our unit or circuit, that needs to be replaced.Thanks to several editors and contributors: If you just want to nit pick without adding constructively to this, please do so in a private message so this thread has the best signal-to-noise ratio… for the benefit of the AK’ers who haven’t been doing this as long as you have. I will happily correct or add to this guide and my own knowledge… when shown my errors in a polite and constructive manner. More-knowledgeable AK’ers are welcome, even encouraged, to point out where I have gotten or stated something wrong. This is merely background info, what I use to find replacements, laid out so less-experienced AK’ers have more information when looking for transistor replacements. There are other threads like this one already on AK (see list below) and none of them had all the tricks I’ve learned and few of them were pedestrian or explanatory enough that *I* might pick up everything being said, so here is my go at “how to find….” This simplistic guide is intended to share some of the how one can look for and find the best replacement transistors… and get better over time as others add to or correct what is already gathered here. I follow the process I’ve cobbled together and picked up from other AK’ers, share my results… and then get asked “how did you determine that result (so I can apply the same process and not have to ask people next time)”. One of the most-often asked questions is “what is a good replacement for transistor XXnnnn”. But these replies get buried in threads that are narrowly focused on a single piece of gear… and therefore provide benefit only to a few people. My replies are mostly basic, sometimes flawed, but always intended to be helpful. That’s a laugh in itself as I’m just a hobbyist, but I’m happy to help where I can. AK has been a wonderful place for me to learn about electronics and vintage audio gear repair and now I find myself answering “how to” questions frequently.
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