File:2SA798 dual pnp transistor, around 1977.jpg

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2SA798 dual pnp transistor, around 1977 or 87

Summary

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Description
English: The 2SA798 was a Japanese dual pnp transistor with BCECB pinout, made by Mitsubishi Electric. In the 1970s and 1980s It was commonly used in the long-tail-pair stages of audio power amps, and unfortunately it commonly fails. With no direct replacement easily available, the best course of action is to use a pair of decent single transistors. These two pieces from a Sharp Optonica receiver seem to be working fine; they were removed and replaced as a precaution, along with the electrolytic caps.
Русский: Двойной pnp-транзистор 2SA798, Япония, Mitsubishi Electric, около 1977 или 78. 2SA798 нередко использовали во входных дифференциальных каскадах УМЗЧ, и к сожалению они нередко выходят из строя. Аналоги достать сложно, поэтому проще заменять их на подобранные пары обычных, одиночных, транзисторов. Конкретно эти два брата-акробата пока работают нормально, но были заменены в ходе "профилактики".
Date
Source Own work
Author Retired electrician
Other versions
Replacing with plain TO-92-packaged transistors, with as close thermal contact as possible

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current16:40, 9 December 2021Thumbnail for version as of 16:40, 9 December 20212,000 × 1,330 (316 KB)Retired electrician (talk | contribs)Uploaded own work with UploadWizard

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