Replacement Transistor 2SC4467?

confused256 · 17th September 2006, 08:31 PM

I have an amplifier and found 3 output transistors 2SC4467(NPN) were bad on one channel. I was searching the forum and two post recommended replacement with 2SA1694(PNP). This amp I beleive is a npn/pnp amplifier cause it has three 2SA1694 and three 2C4467 per channel. So if I use a 2SA1694(PNP) it won't work right? Can I replace the bad ones with TIP35A? Is there a cheaper alternative to the 2SC4467? Can I replace everything with TIP35A/TIP36C? or Replace everything with a better or cheaper setup?
2SC4467(NPN) Manufactored by Sanken/Allegromicro hxxp://www.allegromicro.com/skncatlg/pwrxtr/2sc4467.pdf

Netlist · 17th September 2006, 08:45 PM

Of course you cannot replace the 2SC4467 with the 2SA1694. Both are so called complementary parts.

You need at least TIP35D / TIP36D.
I would stick with the originals despite the higher price. You won't be sorry in the long run.

Don't forget to find out why the NPN bank got broken. (Driver transistors)

/Hugo

EchoWars · 18th September 2006, 12:17 AM

Check with B&D.

http://www.bdent.com/index.jsp

Leolabs · 18th September 2006, 02:36 AM

Or the BD245D/BD246D.

anatech · 18th September 2006, 03:02 AM

Hi confused256,
Netlist has given you valuable advice. You can not blindly replace parts and expect a working amplifier. I would expect more blown parts and more damage. How you replace the parts mechanically is as important as the parts. The proper way to repair this amp would be to install a new matched set of outputs and drivers. I expect more damaged parts further back. It would be wise to get the service manual.

Consider that a manufacturer will always use the least expensive part that will reliably do the job. There is always a reason for using the parts they do. Often they will chose an inferior part. Therefore, don't go backwards.

Now, what make and model amplifier are you working on?
What test equipment do you have?

-Chris

jaycee · 18th September 2006, 03:57 AM

If it is the car amp you showed with the exploded capacitors... you will be lucky if anything is left alive in it. You MUST use the right transistors otherwise you're just going to make it smoke as soon as you switch on.

confused256 · 18th September 2006, 01:42 PM

This amplifier is a concept cc-2502l. I assume the speaker leads were shorted over time. Speakers were removed but amp was still hooked up and I found wires shorted when hooking speakers up again after 3 months. This amp is a different one than the one that has the bad caps.
I have a test bench with dummy load, meter, source, speakers, power source, everything but O-Scope(adding to christmas wish list).
I removed the parts, left them out, and the amp powers up with good voltage on the rails now, but no load.
Thanks for that supplier that is a lot better price than what I could find from NTE replacement $6 a peice.

anatech · 18th September 2006, 02:59 PM

Hi confused256,
NTE stuff is junk. Expensive junk. Don't even consider using it.

My original advice stands. Make sure all heatsink surfaces are clean, the insulators are in good condition Use fresh heatsink grease if used.

Remember, if your amp is cheap or disposable, you still need to repair it properly. If you don't you may as well just simply throw it out right now. Think of this as education.

-Chris

confused256 · 19th September 2006, 10:42 PM

Ok I ordered the correct replacement, do I need to replace both or match the new ones with a set? I ordered both parts. I have mostly replaced power supply transistors and all of them(at least pairs, ran low on parts) in the past.

anatech · 20th September 2006, 01:12 PM

Hi confused256,
You should match the transistors in the channel you are working on. Replace both polarities and the drivers at any rate.

-Chris

17th September 2006, 08:31 PM	#1
confused256 diyAudio Member Join Date: May 2005 Location: Missouri	Replacement Transistor 2SC4467? I have an amplifier and found 3 output transistors 2SC4467(NPN) were bad on one channel. I was searching the forum and two post recommended replacement with 2SA1694(PNP). This amp I beleive is a npn/pnp amplifier cause it has three 2SA1694 and three 2C4467 per channel. So if I use a 2SA1694(PNP) it won't work right? Can I replace the bad ones with TIP35A? Is there a cheaper alternative to the 2SC4467? Can I replace everything with TIP35A/TIP36C? or Replace everything with a better or cheaper setup? 2SC4467(NPN) Manufactored by Sanken/Allegromicro hxxp://www.allegromicro.com/skncatlg/pwrxtr/2sc4467.pdf

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17th September 2006, 08:45 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Of course you cannot replace the 2SC4467 with the 2SA1694. Both are so called complementary parts. You need at least TIP35D / TIP36D. I would stick with the originals despite the higher price. You won't be sorry in the long run. Don't forget to find out why the NPN bank got broken. (Driver transistors) /Hugo

18th September 2006, 12:17 AM	#3
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	Check with B&D. http://www.bdent.com/index.jsp

18th September 2006, 02:36 AM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Or the BD245D/BD246D.

18th September 2006, 03:02 AM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi confused256, Netlist has given you valuable advice. You can not blindly replace parts and expect a working amplifier. I would expect more blown parts and more damage. How you replace the parts mechanically is as important as the parts. The proper way to repair this amp would be to install a new matched set of outputs and drivers. I expect more damaged parts further back. It would be wise to get the service manual. Consider that a manufacturer will always use the least expensive part that will reliably do the job. There is always a reason for using the parts they do. Often they will chose an inferior part. Therefore, don't go backwards. Now, what make and model amplifier are you working on? What test equipment do you have? -Chris

18th September 2006, 03:57 AM	#6
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	If it is the car amp you showed with the exploded capacitors... you will be lucky if anything is left alive in it. You MUST use the right transistors otherwise you're just going to make it smoke as soon as you switch on.

18th September 2006, 01:42 PM	#7
confused256 diyAudio Member Join Date: May 2005 Location: Missouri	This amplifier is a concept cc-2502l. I assume the speaker leads were shorted over time. Speakers were removed but amp was still hooked up and I found wires shorted when hooking speakers up again after 3 months. This amp is a different one than the one that has the bad caps. I have a test bench with dummy load, meter, source, speakers, power source, everything but O-Scope(adding to christmas wish list). I removed the parts, left them out, and the amp powers up with good voltage on the rails now, but no load. Thanks for that supplier that is a lot better price than what I could find from NTE replacement $6 a peice.

18th September 2006, 02:59 PM	#8
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi confused256, NTE stuff is junk. Expensive junk. Don't even consider using it. My original advice stands. Make sure all heatsink surfaces are clean, the insulators are in good condition Use fresh heatsink grease if used. Remember, if your amp is cheap or disposable, you still need to repair it properly. If you don't you may as well just simply throw it out right now. Think of this as education. -Chris

19th September 2006, 10:42 PM	#9
confused256 diyAudio Member Join Date: May 2005 Location: Missouri	Ok I ordered the correct replacement, do I need to replace both or match the new ones with a set? I ordered both parts. I have mostly replaced power supply transistors and all of them(at least pairs, ran low on parts) in the past.

20th September 2006, 01:12 PM	#10
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi confused256, You should match the transistors in the channel you are working on. Replace both polarities and the drivers at any rate. -Chris