Saturday, 6 February 2016

repair - How to find a replacement for an antiquated transistor 2N2148


I need to replace a transistor in my guitar amplifier. The model number listed on the original schematic is 2N2148. It is in a TO3 package and the rest of the specs are listed here.


I am having trouble trying to find a suitable modern replacement and I am unsure whether I should buy a NOS given that it is a germanium component. I found a few on Ebay here and here but I could really use some advice as to what to do in this situation.



Answer



The process of looking for a similar part is called "cross referencing." That is usually done to look for replacements or to approximate the specifications of the original part.


One of the established electronic cross reference database is the former ECG line of Philips. That business was bought out by NTE Electronics and you can access their service here.


Searching for 2N2148 in NTE, the suggested replacement is NTE121. Use the "Check Stock" button to search for where you can buy the replacement.


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