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Transistor replacements anno 2023 [message #28901]

Wed, 18 January 2023 09:04

claussoegaard
Messages: 27
Registered: July 2022

Junior Member

Hi - me again. Still working on my K200A-2. Trying to get as much of the background hum coming out of the PC702 board to go away as possible. Tested all resistors out of circuit and found a handful of noisy ones and replaced them. That helped a lot! However, there's still some noise, and I suspect some of the transistors could be noisy/leaky. I won't go into a wall of text of my findings, but I'd like to swap a few suspect transistors out to help test the idea. So I am looking for transistor replacement help. I found an old post from 2007 from chicagobill, but even those NTE replacements he mentions I struggle finding, unless I want to try my luck with a handful of different eBay sellers. So here's what I'm looking for.

PNP: 40406 / 38734 / 2N4249 / NTE159 -- Modern/commonly available replacement?
NPN: 40408 / 36735 / NTE190 -- Modern/commonly available replacement?
NPN: 2N3567 / NTE123 -- Modern/commonly available replacement?
PNP: 2N3638 / NTE129 -- Modern/commonly available replacement?

Any help would be awesome! I could try finding the datasheets and try finding transistors with similar gain and voltage/current ratings, but I don't know enough about transistors to know if that's all I need to look out for to match them? So expertise help would be greatly appreciated!

Thanks!

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