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Old 19th October 2007, 02:01 PM   #1
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Default 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.

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Old 19th October 2007, 10:55 PM   #2
PM650 is offline PM650  United States
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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:
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Old 22nd October 2007, 12:54 PM   #3
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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.
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Old 23rd October 2007, 12:46 PM   #4
gootee is offline gootee  United States
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You do have to put the implied "2S" back in front of the number. i.e. It's "2SA1102". gave 3470 hits.

- Tom Gootee
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Old 25th October 2007, 02:57 PM   #5
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I've found these parts(matched pairs) from NTE. Is there a better source/brand as I've heard disparaging things about these?
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Old 25th October 2007, 04:48 PM   #6
AndrewT is online now AndrewT  Scotland
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Toshiba, Sanyo & Hitachi are good.
Is PMC = Hitachi?
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 25th October 2007, 11:45 PM   #7
Eva is offline Eva  Spain
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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
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Old 26th October 2007, 10:40 AM   #8
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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.
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