Re: Cyrus One
From a 'reliable' source (ie tried and tested), it seems the BUV48 is a possible replacement, if you can get original old stock, manufactured at a 'similar' date to the ones you are replacing.
From what I can see on the available spec sheets, these (BUV28) are not tightly specified devices so their (important in this design) parameters are likely to vary rather a lot. A much newer manufactured device, even if its called BUV28, is just likely to cause problems and as any plucked out the ether transistor.
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