I've got a TO-92 in the diff pair of the power amp of a Pioneer SX-535 that I can't identify. Top line is TIS112, second line is TIP626, though it certainly isn't one of those. I've replaced all the diff pairs with new matched devices, but wondered about this odd one that somebody stuck in there many years ago.
Did you use KSA992's, or do you have another recommendation?
I have an SX-636 that's waiting patiently for me to dig into it.
jeff
TIS112 ⇒ 2N2906 BC638 BC640
https://obsoletetellyemuseum.blogspot.com/2010/09/table-of-t-series-transistor-equivalents.html
https://obsoletetellyemuseum.blogspot.com/2010/09/table-of-t-series-transistor-equivalents.html
I used matched KSA992s and they worked well.
Now, for your 2025 entertainment I'm going to come clean. I repaired this receiver many years ago. It's been in storage for a couple decades at least, until I recently gave it to a friend. It had a noise problem so I decided to give it its 50-year service. I believe everything should have a 50-year service whether it needs it or not. The TI transistor wasn't the problem, but while looking through my transistor collection, I found I had a bag of them. 1+1=2 and it's pretty certain I'm the culprit who installed it some decades ago because the original had failed and it seemed a decent match. At least I won't have to give it the next 50-year service.
FWIW, I've recapped the power section and will look at the tone and phono boards, but no cap I've removed has had any issues with value, dissipation factor or DC leakage.
Remember that the 992 and 1845 parts are great, but only rated for 50 mA, so don't use them outside their limits.
Now, for your 2025 entertainment I'm going to come clean. I repaired this receiver many years ago. It's been in storage for a couple decades at least, until I recently gave it to a friend. It had a noise problem so I decided to give it its 50-year service. I believe everything should have a 50-year service whether it needs it or not. The TI transistor wasn't the problem, but while looking through my transistor collection, I found I had a bag of them. 1+1=2 and it's pretty certain I'm the culprit who installed it some decades ago because the original had failed and it seemed a decent match. At least I won't have to give it the next 50-year service.
FWIW, I've recapped the power section and will look at the tone and phono boards, but no cap I've removed has had any issues with value, dissipation factor or DC leakage.
Remember that the 992 and 1845 parts are great, but only rated for 50 mA, so don't use them outside their limits.