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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Cross for 2SA49
I have a suspect transistor in the MPX circuit of an HK330A receiver
that is not decoding stereo. The one in question, 2SA49, crosses on the NTE site to an NTE126. I provide the specs for the 2SA49 and the NTE126. Is this a good substitution? Might there be a less espensive option (NTE126 is $4.86 or so). 2SA49 (PNP Ge) Vcbo=-18V Vebo=-12V Vceo(sat)=? Ic=-5mA Pc=60mW fT=? hfe=30-200 (From the Japanese Transistor Manual http://www.datasheetarchive.com/search.php?q=2SA49) NTE126 (PNP Ge) Vcbo=15V Vebo=2.5V Vceo=15V Ic=100uA Pc=150mW fT=300Mhz hfe=40 http://www.nteinc.com/specs/100to199/pdf/nte126.pdf From what I have learned so far, the important parameters for this application are Ic, fT, Vceo. Do I have enough information to select a sub? Also, what is the significance of the negative values indicated on the 2SA49 spec sheet, does this impact how I would install the replacement? |
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