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All of these parts are shorted, so someone attempted repair using substitute parts and the parts failed again. One circuit I worked on used to use an MJ Some circuits were very specific on the characteristics of the part. Anon6f72b to Anonb Anon Jun-7 1: Personally, I’d tend to think that the chances of getting genuine parts from Digikey is pretty good.

Remember when they used to be ECG. Obviously, certain critical parameters have to be met, but even then, operating something close the edge could still lead to early failures. I’ve already sunk several hours in researching these discontinued parts. The other option is to go with all NTE parts, at the risk of investing parts and labor, only to have it sound bad, or worse, datasheey up again.

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2SA968 Datasheet, Equivalent, Cross Reference Search

So it is up to the characteristics being audio-friendly. Whether they will work satisfactorily in this circuit remains to be seen. Something in the back of my mind tells me I should have firmly turned down this job. Were the replacements matched? Just did a search on digikey with a few additional cases that should mount onto a TO heatsink, and not very many results, and of those many are BU’s, which are switching transistors and I assume it’s not what you’re after.

2SA Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

The Sanken’s mentioned above by vintagewino may be your best substitute bets. The O and Y are grades, as another person mentioned above. The originals are 25W dissipation, while the substitutes are 20W dissipation.

Went to an MJ, and they lasted a tad over 10 years. Anonb Anon 2sa986 The pre dafasheet, 2SC and 2SA are proving to be even more elusive than the drivers!

Octopart says no datasheet found and they ask to submit a quote request. I think it ran right at the limit of current. Widespread Centurylink Outage this morning Anonb to shdesigns Anon Jun-7 3: And, if they’re made of unobtainium, yes, good luck.


Class A amps were one case. The finals, though, is not where he allegedly has the problem. They were “ok”, but very 2aa968 when compared to the real thing. Supposedly have many datasbeet each in stock, and cheap. The risk of having one fail and take out a half dozen expensive output transistors, plus devices on the driver board, seems too risky.

Anonb Anon Jun-7 5: Anonb to daveinpoway Anon Jun-8 3: None of which give me a whole lot of peace of mind though. It was rare but does happen. The output transistors appear to be original Sanken RETs. A little too close for comfort on the spec.

Rental car lied to me! I’m not comfortable with this situation, but he’s a regular customer and I don’t want any bad blood for refusing to work with him on this one.

If you’re trying to repair some older solid state devices, good luck in finding germanium components.