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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Dr TinearJul 29, This is daatsheet educational and fun for me. 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.

I can find these, but I do not know if they’re a good replacement. Without more info it’s hard to say what was original.

However, the DC offset is very high. That’s enough increase in speed to provoke HF instability in some amp circuits, so the repair definitely should be checked for parasitic oscillation. TIP33 and 34 are still dahasheet – should use the “C” version v.

2SB688 Datasheet

As mentioned, the originals are TIP34B datasheetbut on the blown channel, someone has replaced datasheef transistor with a 2SB datasheet. How do you get matched pairs of transistors normally? If anybody is interested, here’s a schematic of the amp GIF, kB. Those are about as close as you can get.


Thank you for the suggestions. Or is this caused by another part in the circuit? I’ve looked at the schematic several times before but did not find anything that I could datxsheet that well.

2SB Datasheet(PDF) – Inchange Semiconductor Company Limited

I have taken out the TIP on the blown channel and everything is shorted. Is it likely that any of these could be causing a high dc-offset? RuxmanAug 4, There are seven transistors in total on each power amp section. Thanks a lot for the help! In stock at mouser. Discussion in ‘ Solid State ‘ started by RuxmanJul 29, 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: Man, it is difficult to find these output transistors.

It arrived today, and now the amp works again. 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? That confirms that the TIPs are not original! Unless the amp is running at high voltages, they all should work. Yes, my password is: Any help would be really appreciated! A recap, for example, won’t help at all?


Just get a big bag and test them?

Can be found at most electronic distributors. 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. Do you already have an account? You must log in or sign up to reply here. There are no adjustment points for DC offset in this amp. The 2sb has a higher voltage rating, and the is rated at higher current.

If it’s clean, then dataasheet amp performance is likely to be improved.