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I purchased transistors from Mouser and spend an hour grading and marking them all.
2SA968 Datasheet, Equivalent, Cross Reference Search
If not, this could be a reason why the original repair only lasted a month. So it is up to the characteristics being audio-friendly. The originals are 25W dissipation, while the substitutes are 20W dissipation. 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. All of these parts are shorted, so someone attempted repair using substitute parts and the parts failed again.
I managed to get 32 devices that matched to my tolerance. In audio applications, the fT won’t make a difference. And yes, there were several circuits where I ran into troubles, as they were “close”, but not exact.
Something in the back of my mind tells me I should have firmly turned down this job. Yeah, I’ve seen the 6. But yes, the hFE should be close for each group. It was not that they were bad, it is that thay are a generic replacement for many parts. Anonb to shdesigns Anon Jun-7 3: It was rare but does happen.
The risk of having one fail and take out a half dozen expensive output transistors, plus devices on the driver board, seems too risky. Replacing them with 10V caps solved the issues. Anon6f72b Datashee Jun-8 3: Forward current transfer ratio hFEmin: None of which give me a whole lot of peace of mind though.
My biggest concern is having the amplifier come back a month later because the parts didn’t last. The O and Y are grades, as another person mentioned above. This may dataaheet been part of the reason the recent repair using substitutes failed. If you’re trying to repair some older solid state devices, good luck in finding germanium components.
Class A amps were one case. Would typically last a year. Perhaps things have changed, but, when I used to use NTE substitutes, I never had a fatasheet one out off the box and none of them failed after being installed. Anon6f72b to Anonb Anon Jun-7 2: NTE has a horrid reputation among repair circles and I datasheet to avoid it. Anonb Datasjeet Jun-6 9: Every rebuild of this magnitude comes with a mandatory 2sa68.
The pre drivers, 2SC and 2SA are proving to be even more elusive than the drivers! I think the op simply wants the exact same components. Some circuits were very specific on the characteristics of the part. Were the replacements matched? Anon6f72b to Anonb Anon Jun-7 1: Anonb Anon Jun-7 Class A is the most inefficient, so yes, the constant power dissipation will shorten the life, especially if the substitute has a lower Pd.
The finals, though, is not where he allegedly has the problem. Went to an MJ, and they lasted a tad over 10 years. The output transistors appear to be original Sanken RETs.
2SA Datasheet, PDF – Alldatasheet
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. 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?
And, if they’re made 2sz968 unobtainium, yes, good luck. The Sanken’s mentioned above by vintagewino may be your best substitute bets. If transistors are in parallel, they need to be matched, in order to ensure that they share the load.
Octopart says no datasheet found and they ask to datashwet a quote request. 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. I used them in the ’70s. Personally, I’d tend to think that the chances of getting genuine parts from Digikey is datasheeet good.
It’s rare to find any Sankens that are NOT counterfeit parts these days. Anonb to daveinpoway Anon Jun-8 3: I’ve already sunk several hours in researching these discontinued parts. Most Active Forum Topics this week Friend bragging about 10 year old car with really low mileag [ Automotive ] by IowaCowboy Also the MV diodes get replaced, 2za968 these are notorious for failing and turning on both halves of the output stage simultaneously.
Datashee of the alternatives are not that great lower SOA, current rating, etc.