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Old 11th Jul 2019, 11:25 pm   #13
space_charged
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Join Date: Dec 2014
Location: West Midlands, UK.
Posts: 315
Default Re: Sony 2SD625 line output transistor

OK, well the set does work, a bit, with the KSC5027OTU as the LOT. I have to reduce R514 to about 1 ohm and also put a 2uF (non-electrolytic) across C520. The waveform is a lot better with none of the nasty ringing the darlington produced. I don't think the transistor is high enough gain, not saturating. It gets too hot, but a bit less quickly than the darlington did. It is on a heat sink, and one considerably bigger than the one the Sony 2SD625 was on.
The KSC50270 is listed as having a minimum hfe of 20.
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