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Transistor equivalents NAD
Transistor equivalents NAD
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Old 20th July 2018, 08:05 AM   #1
Depaj is offline Depaj  France
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Default Transistor equivalents NAD

Hi!

I'm stuck trying to repair a Nad 2400 power amp. One channel is down, outputs fried and took 4 out of 6 transistors from the rail switching circuit with them. A pair of 2SB115/2SD1706 and a pair of 2SB895/2SD1347. I'm having a real hard time finding replacements. The only one I stumbled across are just as obsolete.
Suggestions would be much appreciated
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Old 20th July 2018, 08:52 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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I didn't know NAD used germanium transistors!
Check your numbers as my service manual does not list 2SB115 for a start. Where do you get the numbers from?
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Old 20th July 2018, 08:56 AM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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If you mean 2SB1155 the they are available as 2SB1156, higher voltage switching from Semiconductor: 2SB1156 (2SB 1156) - TRANSISTOR... - UK (GBP)
The complement is also available there. Semiconductor: 2SB985 (2SB 985) - TRANSISTOR SILICON PNP / 60V / 3A / 1W / 150MHz... - UK (GBP)
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Old 20th July 2018, 09:33 AM   #4
Depaj is offline Depaj  France
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Yes sorry I did mean 2SB1155. How sure can I be that the parts from Donberg are genuine ?
The picture for starters doesn't look the same as the one the came out. I've always been suspicious as they have almost all transistors that are very hard to find elsewhere. I've ordered from little diode before and got a bunch of fakes.
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Old 20th July 2018, 10:03 AM   #5
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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If you pay by card or paypal you can claim your money back if they are not as described.
I have used them for older components and had no issues.
Why not use 2SA1943/2SC5200?
Bipolar Transistors | RS Components
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Old 20th July 2018, 10:09 AM   #6
Depaj is offline Depaj  France
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I will give it a try and hope for the best.

I assume nad had a good reason not to use the same transistors in these two applications. Do you see a reason why ? I've ordered 2SA1943/2SC5200 as outputs. The original outputs are 2SA1519/2SC3907.
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Old 21st July 2018, 01:45 PM   #7
Depaj is offline Depaj  France
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I want to try something before ordering parts and taking these parts and taking the risk of getting fake ones.

In you opinion, could I use as you suggested 2SA1943/2SC5200 to replace 2SB1155/2SD1706 and replace the 2SB985/2SD1347 With 2SB1203/2SD1803 ?
They seem pretty close in spec and are all available at mouser from On-semi in TO251 package.
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Old 21st July 2018, 10:59 PM   #8
jaycee is offline jaycee  United Kingdom
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You could use the 2SA1943/2SC5200 for the outputs. I personally would use NJW3281/NJW1302 simply because they're in TO-3P packages like the originals.

For replacing the 2SB985/2SD1347 transistors, KSA1220/KSC2690 would be my choice. Or for a similar package KSA931/KSC2331

Last edited by jaycee; 21st July 2018 at 11:04 PM.
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Old 22nd July 2018, 08:42 AM   #9
Ian Finch is offline Ian Finch  Australia
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If you want assurances from an authorized distributor, Mouser will also sell Fairchild/On-semi's clones of C5200/A1943 in any package you want. These are also TO3-P variations, often at a better price: https://www.fairchildsemi.com/datasheets/FJ/FJA4313.pdf
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Old 22nd July 2018, 10:29 AM   #10
Depaj is offline Depaj  France
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Mouser has the 2SA1943/2SC5200 from toshiba in To-3P cases as well at roughly the same price. I don't really see the need to take exactly the same case here, as long as there is a single mounting whole I should be fine, they are individually mounted to the heat sink anyway.
Quote:
You could use the 2SA1943/2SC5200 for the outputs.
My question was more regarding the 2SB1155/2SD1706.


Quote:
For replacing the 2SB985/2SD1347 transistors, KSA1220/KSC2690 would be my choice. Or for a similar package KSA931/KSC2331
From what I can see the collector current capabilities for these two options is way lower than the original 2SB986/2SD1347.
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