What to do w/ Kenwood KA-5700 w/ blown outputs?
 

I searched and found nothing relevant...

I have a really clean and nice-looking Kenwood KA-5700 integrated amp that's been sitting in my closet for over 15 years. I blew the outputs in one channel by shorting the speaker leads with the amp on (dumb, I know). I've asked around and it seems the output transistors were D587A and B617A, of a special shape different than TO220.

First off, does anyone know of transistors that could substitute for the original D587A and B617A output devices? They're way obsolete, and I can't seem to find them for less than $20 each (ouch). I'd like to get an idea of how much physical modification and rejiggering would be necessary to retrofit TO220 or similar transistors... I don't want to make this a major project.

The other alternative is to sell it for parts on eBay or something, or offer it up here for anybody who would like a really clean KA-5700 chassis. If someone here really wants it, all I'd be looking for is to cover the cost of shipping.

Thanks.

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Yea those outputs are oddball.
You might be able to fit some TO-220's (40-50W) but the design would be on the edge for +/- 40V DC rails. It's rated for 40 watts but most likely can output~ 70W at clipping.
You will also have to replace more (special gain driver) transistors, besides the 2 outputs. Check the diode string nearby, if they are bad then it would NOT be worth the effort, unless you have skills to re-adjust the fixed bias.

I need a 2SB618A for a Harman Kardon receiver. No longer available, that batwing design. I'd retrofit but the chip would have to be very close.

i have some pulled from a working amp... i have to go check exact part, but it was batwing style