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Old 10th February 2013, 09:58 AM   #81
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At typical listening levels, there may be little difference in "sound quality" between these parts and they may be safe even at full power. Any apparent difference will more likely have to do with with any "match" between the different architectures of the Quasi-complementary output stage. This does affect the distortion pattern but it's not always noticeable in Naim designs, probably due to the heavy tweaks used elsewhere in the circuit.
MJE 13009 series parts are 200V types but have almost the same DC SOA rating of ~3 amps at 30V. FJE 13009, though, seems to be Chinese origin, usually in a TO3P package and not as I first assumed, from Fairchild. I can't find much data on these and to be honest, I would not trust what seems to be a generic part there, possibly with several unknown sources, packages and specs.

Maybe other members have more information on these as TO220 parts.

I would seek out ST Micro parts. There should be several sources of genuine BD911 series parts in Europe, including Farnell, Conrad, TME, RS-online etc. BD743 was an early source of these, but essentially the same transistor. I don't see any advantage though in using original NOS parts. The first datasheet, looking at current BD743 products, shows minor differences to the original Texas part, so you have to be careful what you are comparing:
http://www.datasheetcatalog.org/data...ns/mXqqwtx.pdf
http://www.st.com/internet/com/TECHN...CD00001277.pdf
bd743 transistor | Datasheet Archive
At less than $1 ea, it's hardly worth quibbling about using current standard types, as long as they do meet the ratings, with the necessary derating when used with the amplifier case as a heatsink, as do the NAP amplifiers. Buy several from the same pack, if you can, and try to measure with your meter for a best match of gain (Hfe) - not that it will improve performance but you may match the channels better and that will sound better. It could be worth experimenting but take care with damaging the PCB any more.
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Old 10th February 2013, 10:41 AM   #82
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I think the part you have is actually FJP13009, similar to MJE13009 and also comes in a larger package option.
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Old 10th February 2013, 08:58 PM   #83
gilwe is offline gilwe  United States
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This is what I currently use:

http://orzparts.com/images/J13009-2.jpg
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Old 11th February 2013, 05:08 AM   #84
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Yes, there are several Chinese resellers using the marking as a part number in the way you see on the 'net but this is likely the data sheet they will refer to: http://datasheet.seekic.com/pdfimage/J13/J13009pdf1.jpg
Several manufacturers print only abbreviated numbers on the parts, like this. In any case, we are both talking about the same Fairchild part, so no problem.
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