I'm working on a Kenwood Super Eleven receiver that came to me with shorted outputs in one channel. As I make my way through the rest of the circuit to see what else may have been damaged, I came to a shorted 2SA1111 driver, Q18 on the attached schematic (haven't checked the 2SC2591 yet). These are long obsolete, which is unfortunate because both have pretty fast transition frequencies--200MHz. So far the best subs I've come up with are 2SA1859A/2SC4883A.
Thoughts?
Thoughts?
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I looked back at my Digikey orders from the time of that post, and I did order 2SA1859A and 2SC4883A. And I also know that I did fix that amp. I just can't tell you with 100 percent certainty that those drivers are what I installed, though it's likely.