Re: Sony 2SD625 line output transistor
It may not have been specially selected in this case. Just a high gain high speed type which is rather tame compared to some later types. I don't have hands on experience with those earlier Sony models, but in later models the selection was indicated by a printed suffix (for example BU508AS instead of BU508A - the slightly better BU2508A worked just fine if I remember correctly). Also in that case, if you replace it with a later production example or with a slightly better equivalent, chances are you won't have a problem with it since it would meet the original selection criteria.
Also, I don't think every transistor is as critical. Sony may have had optimised designs, but they weren't completely daft. Horizontal output transistors tend to be somewhat critical regardless of the brand, anyway.
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