I posted this in DIY, but thought I might post this here as well for folks familiar with these units.
So I'm recapping the power amp boards on my KLH Model 20 compact stereo unit and one of the boards is obviously not happy when I put it back in. Take a close look at the board and I see that one of the legs has popped off one of the transistors. Bummer. Looks like I need to order a replacement.
So what have I got here?
The marking on the transistor has a rather stylized "F" (I'm assuming this is the Fairchild logo) and "S-1970-613."
Luckily, there is a schematic on the bottom of the unit. Unluckily, this thing is very hard to read between the fuzzy microprint and the fact that the bottom of the unit has been roughed up over 40 years. Best as I can tell, it looks like my problem is with Q322. This is on the transistor list (as far as I can tell with the fuzzy print) as "TI SG 4625, 2N2904, FAIRCHILD S1970, 2N4061"
Please note that any of these characters may be wrong! This thing is that hard to read.
So what I'm hoping someone can tell me that this is the proper designation for this Fairchild transistor (the Fairchild Semiconductor obsolete product search is no help) and that all I need to do is order a 2N4061 or 2N2904 transistor or equivalent (such as the NTE234 or NTE129) to replace this. Any guidance here would be greatly appreciated.
Thanks in advance for the help!
So I'm recapping the power amp boards on my KLH Model 20 compact stereo unit and one of the boards is obviously not happy when I put it back in. Take a close look at the board and I see that one of the legs has popped off one of the transistors. Bummer. Looks like I need to order a replacement.
So what have I got here?
The marking on the transistor has a rather stylized "F" (I'm assuming this is the Fairchild logo) and "S-1970-613."
Luckily, there is a schematic on the bottom of the unit. Unluckily, this thing is very hard to read between the fuzzy microprint and the fact that the bottom of the unit has been roughed up over 40 years. Best as I can tell, it looks like my problem is with Q322. This is on the transistor list (as far as I can tell with the fuzzy print) as "TI SG 4625, 2N2904, FAIRCHILD S1970, 2N4061"
Please note that any of these characters may be wrong! This thing is that hard to read.
So what I'm hoping someone can tell me that this is the proper designation for this Fairchild transistor (the Fairchild Semiconductor obsolete product search is no help) and that all I need to do is order a 2N4061 or 2N2904 transistor or equivalent (such as the NTE234 or NTE129) to replace this. Any guidance here would be greatly appreciated.
Thanks in advance for the help!
