KEC Transistor Data Sheets

I've seen KEC brand transistors in new equipment but am unable to find data sheets on them.

I'm currently looking at the Sherwood 4109 receiver and the darlington output devices are:
2SD1510
2SB2510

The 2SD1510 shows up as a Panasonic darlington but it is in the wrong package and is clearly not the part.

Here is the web site for the company:
KEC

Thought to look under darlington on their own page and I think that I found them under KTD1510:
http://www2.kec.co.kr/data/databook/pdf/KTD/Eng/KTD1510.pdf

and KTB2510:
http://www2.kec.co.kr/data/databook/pdf/KTB/Eng/KTB2510.pdf

Look to be copies of Sanken parts.
Seems I answered my own question but I'll post this anyway in case anyone else is looking.
 
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PEte alike here though some of their parts like KSC 3200 eventhough look like having astronomical specs fail quiet often ..

Like the darlingtons 50MHZ ft ????? No way ...

The circuit is alike Denon AVR 1705 obviously you need to measure bias in a working ch to see how much it was replace with the Denon set 2SD2399 2SB1560 see if you lucky and then probably add a trimmer in the Vbe multiplier to have adj. option

Kind regards
Sakis