Yep, looks similar to these Chinese transistors.
https://www.ebay.com.au/itm/284578273534?hash=item42422fd8fe:g:ALoAAOSwUYRdm-Zj
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(Topic ID: 73117)
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Quoted from Zitt:I think the problem is MPSA42 have been near EOL (end of life) for years.
https://www.digikey.com/en/products/detail/onsemi/MPSA42/32397
seems to be the only supplier which still has stock. It's unclear how long these will remain available.
An EOL notice was issued in 2007; but it appears it was on the old leaded part... unclear how long the new part will remain available.
Ed still has genuine MPSA42s in stock.
https://www.greatplainselectronics.com/proddetail.asp?prod=MPSA42
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