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In audio applications, the fT won’t make a difference. Every rebuild of this magnitude comes with a mandatory recap. Datasheet was troublesome even 30 years ago! I told him it’s not worth more than a grand in non-working condition, but he was unable to negotiate cheaper and badly wants this receiver. So it is up to the characteristics being audio-friendly.
Something in the back of my mind tells me I should have firmly turned down this job. Shorted outputs, shorted drivers and pre drivers.
I purchased transistors from Mouser and spend an hour grading and marking them all. The finals, though, is not where he allegedly has the problem. Anon6f72b Anon Jun-8 3: Anonb Anon Jun-6 9: Class 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 2: Remember when they used to be ECG.
Toshiba 2SA Datasheet.
Obviously, certain critical parameters have to be met, but even then, operating something close the edge could still lead to early failures. Anonb Anon Jun-8 The Pd is the same for the replacement pair specified, are the device pinouts.
The risk of having one fail and take out a half dozen expensive output transistors, plus devices on the driver board, seems too risky. Parts Express has the NTE 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, blow dataaheet again.
Octopart says no datasheet found and they ask to submit a quote request. I’ve seen that with 6. Friend bragging about 10 year old car with really low mileag [ Automotive ] by IowaCowboy If transistors are in parallel, they need to be matched, in order to ensure that they share the load. One circuit I worked on used to use an MJ Comes up not found at my regular suppliers.
Yeah, I’ve seen the 6. They really ARE made of unobtainium! If not, this could be a reason why the original repair only lasted a month. Perhaps things have changed, but, when I used to use NTE substitutes, I never had a bad one out off the box and none of them failed after being installed.
I used them in the ’70s.
2SA Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
The fT is lower than original, but that should not present a problem. It was not that they were bad, it is that thay are a generic replacement for many parts. Anonb Anon Jun-7 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?
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.
Supposedly have many of each in stock, datasheett cheap.