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2db688 mentioned, the originals are TIP34B datasheetbut on the blown channel, someone has replaced the transistor with a 2SB datasheet. Man, it is difficult to find these output transistors. Thank you for the suggestions.
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There are seven transistors in total on each power amp section. Log in or Sign up. Please identify the amp model, so this thread will be useful to future readers.
Now, with your insight, I looked again and found something of great interest!
Need a modern replacement of a TIP34B transistor
That’s enough increase in speed to provoke HF instability in some amp circuits, so the repair definitely should be checked for parasitic oscillation.
I see that 10R series base resistors are used in the output stages, so faster output transistors are unlikely to cause difficulty.
I guess I’m going to have to go with those, but I’ve gotten the impression that they are not entirely suitable. OK, so the mystery is solved. TIP33 and 34 are still available – should use the “C” version v.
And finally, 2SC or 2SC HyperionAug 4, Is it likely that any of these could be causing a high dc-offset? Tip 35C and 36C are higher powered versions and are still available.
A recap, for example, won’t help at all? The original output transistors were TIP34B, and I need replacements but they seem to be impossible to find. FootFungusAug 4, I do intend to recap it, but I just don’t want to have any false hope over this getting fixed by that. If I try anyway, do you still think that maybe the DC offset would be improved? Any help would be really appreciated! If it’s clean, then overall amp performance is likely to be improved.
2SB Datasheet(PDF) – Inchange Semiconductor Company Limited
So I take it that these two transistors are the only thing that is relevant for the dc offset? No, create an account now.
What about getting proper output transistors? Do you already have an account? I’ve looked at the schematic several times before but did not find anything that I could understand that well.
But I have no way of making sure they are matched.
I have taken out the TIP on the blown channel and everything is shorted. If anybody is interested, here’s datasgeet schematic of the amp GIF, kB. Also, a small 1uF cap had exploded on this channel.
2SB688 Datasheet, Equivalent, Cross Reference Search
In stock at mouser. A total power supply voltage of 88V is really asking too much from anything in the family, even if the devices were pre-tested above that voltage with a curve tracer. Dynaco used TIP transistors in several of their designs. I can find these, but I do not know if they’re a good replacement. And then there are three more, I have not looked at them because they are hard to reach, but according to the schematic they are either: Can be found at most electronic distributors.
There are no adjustment points for DC offset in this amp. I ordered a new TIP transistor before starting this thread. The two outputs, and then very near those, 2SA and 2SC Thanks a lot for the help! Those are about as close as you can get.
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You had a schematic the whole time?! Unless the amp is running at high voltages, they all should work. Basically it sounds like you have a smorgasbord of output transistors.