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Most Active Forum Topics this week Some circuits were very specific on the characteristics of the part. The risk of having one fail and take out a half dozen expensive output transistors, plus devices on the driver board, seems too risky.

They were “ok”, but very expensive when compared to the real thing. Obviously, certain critical parameters have to be met, but even then, operating something close the edge could still lead to early failures.

Whether they will work satisfactorily in this circuit remains to be seen. Anonb Anon Jun-7 5: Something in the back of dqtasheet mind tells me I should have firmly turned down this job. Adtasheet A is the most inefficient, so yes, the constant power dissipation will shorten the life, especially if the substitute has a lower Pd.

Anon6f72b to Anonb Anon Jun-7 1: It was not that they were bad, it is that thay are a generic replacement for many parts. You mean re-marked so it’s not what it’s supposed toor just a fake manufacturer, so a possibly inferior product can command a higher price?


It’s like that feeling when you step into a mud puddle and discover it is much deeper than it looked and you find yourself up to your knees in mud and think “well, I may as well keep going. Shorted outputs, shorted drivers and pre drivers.

That was troublesome even 30 years ago! Anonb to shdesigns Anon Jun-7 3: There are people datasheer argue that matching isn’t critical if emitter resistors are employed. I think it ran right at the limit of current. Were the replacements matched?

Anonb Anon Jun-8 I’ve already sunk several hours in researching these discontinued parts. The originals are 25W dissipation, while the substitutes are 20W dissipation. I purchased transistors from Mouser and spend an hour grading and marking them all. Anonb Anon Jun-6 9: Also the MV diodes get replaced, as these are notorious for s2a968 and turning on both halves of the output stage simultaneously.

2SA datasheet & applicatoin notes – Datasheet Archive

Octopart says no datasheet found and they ask to submit a quote request. Class A amps were one case. Dear Comcast, I won’t use your email service Rental car lied to me! Due to the cost of the parts involved and the uncertainty that substitutes will work with long term reliability, I am reluctant to take on the project. I’ve seen that with 6. I used them in the ’70s. If not, this could be a reason why the original repair only lasted a month.

2SA Datasheet, PDF – Alldatasheet

Went 2za968 an MJ, and they lasted a tad over 10 years. Then again, this was around 10 years ago and earlier. I managed to get 32 devices that matched to my tolerance. All of these parts are shorted, so 2sw968 attempted repair using substitute parts and the parts failed again.

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The fT is lower than original, but that should not present a problem. There is evidence that the Darlington pairs had been replaced with substitutes fresh solder, part numbers differ from schema.

2SA968 Datasheet

In audio applications, the fT won’t make a difference. Comes up not found at my regular suppliers. Supposedly have many of each in stock, and cheap. And, if they’re made of unobtainium, yes, good 2xa968.

(PDF) 2SA968 Datasheet download

Widespread Centurylink 2xa968 this morning Perhaps things have changed, but, when Datssheet used to use NTE substitutes, I never had a bad one out off the box and none of them failed after being installed. The pre drivers, 2SC and 2SA are proving to be even more elusive than the drivers! And yes, there were several circuits where I ran into troubles, as they were “close”, but not exact.

But yes, the hFE should be close for each group. The output transistors appear to be original Sanken RETs. One circuit I worked on used to use dataeheet MJ Yeah, I’ve seen the 6. Anonb to daveinpoway Anon Jun-8 3: Every rebuild of this magnitude comes with a mandatory recap.

Anon6f72b to Anonb Anon Jun-7 2: They really ARE made of unobtainium!