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May 14, 2025, 04:21:57 PM

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Acoustic 470 transistor subsitution

Started by Axtman, April 29, 2025, 04:08:04 PM

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Axtman

I am currently working on an old Acoustic 450 amplifier. I narrowed the problem down to a blown PNP predriver transistor. The model number is 480041. I cannot find any information on this transistor. What would be a good substitute? Thanks.

DrGonz78

"A person who never made a mistake never tried anything new." -Albert Einstein


g1

As far as I know that is the Acoustic number for the 40410.  If you search for that number you will find a lot of posts about different subs people have used. 
The issues are finding something with the same pinout that will physically fit and have a heatsink. 
If you can find a 2N5679, that should be able to work if you reuse the existing heatsink.  Seems like Mouser has stock on them.
Otherwise, something in a TO-126 package can be made to work with the existing heatsink.

dmeek

This is an old photocopy from my file cabinet. Bad copy but better than nothing I guess.

dmeek


I de-ciphered and re-typed the list as best as I could and added a few more.

Also here is a list of PC Boards while I'm here.