isc website: 1 isc Silicon PNP Power Transistor. 2SB DESCRIPTION. ·Collector-Emitter Breakdown Voltage V(BR)CEO= V(Min) . 2SB Transistor Datasheet pdf, 2SB Equivalent. Parameters and Characteristics. SILICON PNP TRIPLE DIFFUSED TYPE. 2SB Unit in mm. AUDIO FREQUENCY POWER AMPLIFIER APPLICATIONS. MAX. FEATURES.

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2SB688 Datasheet PDF

Basically it sounds like you have a smorgasbord of output transistors. So I take it that these two transistors are the only thing that is relevant for the dc offset?

Some are probably very. Oregon, land of magnificent stumps. Share This Page Tweet. Please identify the amp model, so this thread will be useful to future readers.

2SB Datasheet PDF – Wing Shing International Group

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. Now, with your insight, I looked again and found something of great interest! A random pair of KSA devices from the same batch are probably matched well enough for the input diff-amp stage, especially if you get them from the highest hFE ranks F or E.

But I have no way of making sure they are matched. Those are about as close as you can get. What about getting proper output transistors? Is it likely that any of these could be causing a high dc-offset? Also, a small 1uF cap had exploded on this channel. Any help would be really appreciated!


The original output transistors were TIP34B, and I need replacements but they seem to be impossible to find. How do you get matched pairs of transistors normally?

IMO the 2sb and 2sd would probably be the best sounding if you could get the original Toshiba parts – most are now made in China and vary in quality and reliability. I have an amp with a blown channel. Discussion in ‘ Solid State ‘ started by RuxmanJul 29, BinaryMikeAug 4, catasheet BinaryMikeAug 1, Dr TinearJul 29, In stock at mouser. Back to original question. Datasheeg, my password is: However, the 2wb688 offset is very high.

I do not really understand how to find comparable devices, so I would really, really appreciate some guidance on this. Tip 35C and 36C are higher powered versions and are still available.

HyperionAug 4, RuxmanJul 29, There are seven transistors in total on each power amp section. Thanks a lot for the help!

Thank you for the suggestions. Man, it is difficult to find these output transistors. The two outputs, and then very near those, 2SA and 2SC Satasheet is this caused by another part in the circuit?

That confirms that the TIPs are not original! It’s an OEM amp I do intend to get the proper transistors datasjeet, this was just a test. I ordered a new TIP transistor before starting this thread.


2SB Datasheet(PDF) – Unisonic Technologies

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: OverLoad dataasheet, Jul 29, It arrived today, and now the amp works again. If anybody is interested, here’s a schematic of the amp GIF, kB. No matter where I put the probes, I get continuity. They spec’d 2SB and comp 2SD as suitable as well. You must log in or sign up to reply here.

Just get a big bag and test them?

I can find these, but I do not know if they’re a good replacement. I see that 10R series base resistors are used in the output stages, so faster output transistors are unlikely to cause difficulty.

Thanks for the advice so far. 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 guess I’m going to have to go with those, but I’ve gotten the impression that they are not entirely suitable.

BinaryMikeJul 29, No, create an account now. And finally, 2SC or 2SC