Prower transistor replacements

cathode_ray · 19th October 2007, 02:01 PM

I have an OLD DENON integrated amp (DM300). Distortion on one side. Someone's been in there and replace output devices unlike those on other side. I would like to replace with indenicle part (within reason) and having trouble x-reffing them. Output devices = 2577 and ATT02 (both SK)
I found a replacement for the 2577 - 2SC2578(NPN 140v, 7A, 70W) but can't find one for the ATT02.
thanx,

Ashley

PM650 · 19th October 2007, 10:55 PM

Japanese transistors always (at least all that I've ever seen) have part numbers like this: A949, C2603, etc.. That is to say, a letter followed by 3-4 numbers, sometimes with an additional letter following the part no. to indicate other parameters (2SB649A, 2SD600K, etc.).
The ATT02 is really A1102 (this is the complement to C2577).
The complement to C2578 is A1103.
Very useful site: http://www.datasheetarchive.com

cathode_ray · 22nd October 2007, 12:54 PM

Thanks so much. I'm a tube guy so this is new territory. I have found some subs but the only A1102(ATT02) is a HAll effect switch... I'll keep searching.

gootee · 23rd October 2007, 12:46 PM

You do have to put the implied "2S" back in front of the number. i.e. It's "2SA1102". Google.com gave 3470 hits.

- Tom Gootee

http://www.fullnet.com/~tomg/index.html

cathode_ray · 25th October 2007, 02:57 PM

I've found these parts(matched pairs) from NTE. Is there a better source/brand as I've heard disparaging things about these?

AndrewT · 25th October 2007, 04:48 PM

Hi,
Toshiba, Sanyo & Hitachi are good.
Is PMC = Hitachi?

Eva · 25th October 2007, 11:45 PM

Those transistors are probably obsolete and no longer produced by the original manufacturer, and this means that you are probably going to get fakes, rebranded parts or sub-standard stuff if you buy them (including NTE replacements). Look for modern transistors having similar parameters. Sanken and Toshiba will have nice substitutes. You can try to find threads discussing output transistors with the search engine, there is plenty of info on models and sources.

EchoWars · 26th October 2007, 10:40 AM

Listen to Eva...these transistors have been obsoleted by the manufacturer for many years. You can just about be guaranteed that anything you find with those numbers will be counterfeit.

19th October 2007, 02:01 PM	#1
cathode_ray diyAudio Member Join Date: Feb 2007	Prower transistor replacements I have an OLD DENON integrated amp (DM300). Distortion on one side. Someone's been in there and replace output devices unlike those on other side. I would like to replace with indenicle part (within reason) and having trouble x-reffing them. Output devices = 2577 and ATT02 (both SK) I found a replacement for the 2577 - 2SC2578(NPN 140v, 7A, 70W) but can't find one for the ATT02. thanx, Ashley

25th October 2007, 04:48 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, Toshiba, Sanyo & Hitachi are good. Is PMC = Hitachi? __________________ regards Andrew T.

25th October 2007, 11:45 PM	#7
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Those transistors are probably obsolete and no longer produced by the original manufacturer, and this means that you are probably going to get fakes, rebranded parts or sub-standard stuff if you buy them (including NTE replacements). Look for modern transistors having similar parameters. Sanken and Toshiba will have nice substitutes. You can try to find threads discussing output transistors with the search engine, there is plenty of info on models and sources. __________________ I use to feel like the small child in The Emperor's New Clothes tale

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Transistor replacements	carlmart	Solid State	43	26th April 2012 05:09 PM
Quad 33 transistor replacements	mcolliva	Solid State	26	9th June 2009 01:13 PM
Transistor replacements	glen65	Solid State	1	19th November 2007 07:48 PM
Novice Question on Transistor Replacements	TGRANT	Solid State	6	4th November 2006 10:51 AM
JLH Hphone amp transistor replacements	colin.hepburn2	Parts	1	11th April 2004 05:15 PM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

19th October 2007, 10:55 PM	#2
PM650 diyAudio Member Join Date: Jul 2005 Location: Tennessee	Japanese transistors always (at least all that I've ever seen) have part numbers like this: A949, C2603, etc.. That is to say, a letter followed by 3-4 numbers, sometimes with an additional letter following the part no. to indicate other parameters (2SB649A, 2SD600K, etc.). The ATT02 is really A1102 (this is the complement to C2577). The complement to C2578 is A1103. Very useful site: http://www.datasheetarchive.com

22nd October 2007, 12:54 PM	#3
cathode_ray diyAudio Member Join Date: Feb 2007	Thanks so much. I'm a tube guy so this is new territory. I have found some subs but the only A1102(ATT02) is a HAll effect switch... I'll keep searching.

23rd October 2007, 12:46 PM	#4
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	You do have to put the implied "2S" back in front of the number. i.e. It's "2SA1102". Google.com gave 3470 hits. - Tom Gootee http://www.fullnet.com/~tomg/index.html

25th October 2007, 02:57 PM	#5
cathode_ray diyAudio Member Join Date: Feb 2007	I've found these parts(matched pairs) from NTE. Is there a better source/brand as I've heard disparaging things about these?

26th October 2007, 10:40 AM	#8
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	Listen to Eva...these transistors have been obsoleted by the manufacturer for many years. You can just about be guaranteed that anything you find with those numbers will be counterfeit.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read