I've been looking for a replacement for a couple days, and the closest I've come is the below options. Would these be suitable replacements, or is there a better option I haven't come across yet?
They are from an Alpine MRV-1507 on the audio board is where I have one shorted, and that part seem to be end of life.
These seem promising other than the gain bandwidth:
https://www.mouser.com/ProductDetail/?qs=5C9Q4QJFsuOFzbCX6nRlHg==
https://www.mouser.com/ProductDetail/?qs=Mv7BduZupUjGQix8c1RZeA==
They are from an Alpine MRV-1507 on the audio board is where I have one shorted, and that part seem to be end of life.
These seem promising other than the gain bandwidth:
https://www.mouser.com/ProductDetail/?qs=5C9Q4QJFsuOFzbCX6nRlHg==
https://www.mouser.com/ProductDetail/?qs=Mv7BduZupUjGQix8c1RZeA==
For stages where lower current is ok, like VAS, KSA1381 , KSC3503 is great , high gain , high ft. 2SA1837, 2SC4793 is now made by UTC, sold at Pro Fusion, tried them - it's the real deal. The case is different, but functionally interchange perfectly, and take higher voltages.
@86boy , Knowing what it does in the circuit would give us a bit more to go on, and which parameters are more important than others.
The service manual for the Alpine MRV-1507. Perhaps the device is Q709 or Q710? These are labelled "OVERLOAD DETECTOR" on p. 27; p. 28 says Ve = 8.1v. It looks like when the voltage coming in from pin 6 (CB601?) gets high enough, these transistors would turn on?
KSA1220A is a PNP device, Vcbo & Vceo = -160V, Ic = -1.2A, Power dissipation = 1.2W, and Y-grade has hfe = 160-320.
The service manual for the Alpine MRV-1507. Perhaps the device is Q709 or Q710? These are labelled "OVERLOAD DETECTOR" on p. 27; p. 28 says Ve = 8.1v. It looks like when the voltage coming in from pin 6 (CB601?) gets high enough, these transistors would turn on?
KSA1220A is a PNP device, Vcbo & Vceo = -160V, Ic = -1.2A, Power dissipation = 1.2W, and Y-grade has hfe = 160-320.
But looking at the parts list, there are other places where the KSA1220A is used, so maybe your problem is elsewhere.
Thank you for this info!
This one specifically is Q418, and I did remove the part from the board where I discovered it was this part. There's no short on the board with the part removed, but there is however a short between the emitter and collector on that part.