Wat is PDF History 2SB688 DATASHEET PDF


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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Discussion in ‘ Solid State ‘ started by RuxmanJul 29, Log in or Sign up. I have an amp dafasheet a blown channel. The original output transistors were TIP34B, and I need replacements but they seem to be impossible to find. I do not really understand how to find comparable devices, so I would really, really appreciate some guidance datazheet this.

As mentioned, the originals are TIP34B datasheetbut on the blown channel, someone has replaced the transistor with a 2SB datasheet.

I can find these, but I do not know if they’re a good replacement. Any help would be really appreciated! RuxmanJul 29, OverLoadJul 29, Dynaco used TIP transistors in several of their designs. Dr TinearJul 29, It’s an OEM amp Thanks for the advice so far. The 2sb has a higher voltage rating, and the is rated at higher current. Unless the amp is running at high voltages, they all should work. 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.

Some are probably very. Basically it sounds like you have a smorgasbord of output transistors. Without more info it’s hard to say what was original.

Thanks a lot for the help! This is very educational and fun for me. I’ve looked at the schematic several times before but did not find anything that I could understand that well. Now, with your insight, I looked again and found something of great interest! That confirms that the TIPs are not original! I have taken out the TIP on the blown channel and everything is shorted. No matter where I put the probes, I get continuity.


Maybe that is why it has been smoked? Also, a small 1uF cap had exploded on this channel.

Oregon, land of magnificent stumps. 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. BinaryMikeJul 29, You had a schematic the whole time?! OK, so the mystery is solved.

They spec’d 2SB and comp 2SD as suitable as well. Back to original question.

2SB688 Datasheet PDF

TIP33 and 34 are still available – should use the “C” version v. Tip 35C and 36C are higher powered versions and are still available. Can be found at most electronic distributors. In stock at mouser.

(Datasheet) 2SB pdf – POWER TRANSISTORS(8A/V/80W) (1-page)

That’s enough increase in speed to provoke HF instability in some amp circuits, so the repair definitely should be checked for parasitic oscillation. If it’s clean, then overall amp performance is likely to be improved. BinaryMikeAug 1, I ordered a new TIP transistor before starting this thread. It arrived today, and now the amp works again.

I do intend to get the proper transistors soon, this was just a test. However, the DC offset is very high. Or is this caused by another part in the circuit? There are no adjustment points for DC offset in this amp. There are seven transistors in total on each power amp section. The two outputs, and then very near those, 2SA and 2SC 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: And finally, 2SC or 2SC Is it likely that any of these could be causing a high dc-offset?


If anybody is interested, here’s a schematic of the amp GIF, kB.

2SB688 Datasheet, Equivalent, Cross Reference Search

RuxmanAug 4, Those are about as close as you can get. FootFungusAug 4, Thank you for the suggestions. Man, it is difficult to find these output transistors. I guess I’m going to have to 2sb868 with those, but I’ve gotten the impression that they are not entirely suitable.

But I have no way of making sure they are matched. If I try anyway, do you still think that dtaasheet the DC offset would be improved? HyperionAug 4, So I take it that these two transistors are the only thing that is relevant for the dc offset? A recap, for example, won’t help at all? What about getting proper output transistors? I do intend to recap it, but I just don’t want to datasgeet any false hope over this getting fixed by that.

How do you get matched pairs of transistors normally? Just get a big bag and test them? 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. I see that 10R series base resistors are used in the output stages, so faster output transistors are unlikely ddatasheet cause difficulty. Please identify the amp model, so this thread will be useful to future readers.

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