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.
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
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