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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TIP33 and 34 are still available – should use the “C” version v. How do you get matched pairs of transistors normally?

Now, with your insight, I looked again and found something of great interest! No matter where I put the probes, I get continuity.

2SB (Mospec) – Power Transistors(8a,v,80w), PNP

OK, so the mystery is solved. There are seven transistors in total on each power amp section. Is 2ssb688 likely that any of these could be causing a high dc-offset?

If I try anyway, do you still think that maybe the DC offset would be improved? I have taken out the TIP on the blown channel and everything is shorted. A recap, for example, won’t help at all?

The 2sb has a higher voltage rating, and the is rated at higher current. Any help would be really appreciated! 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.


Tip 35C and 36C are higher powered versions and are still available. The two outputs, and then very near those, 2SA and 2SC Can be found at most electronic distributors. If it’s clean, then overall amp performance is likely to be improved. I guess I’m going to have to go with those, but I’ve gotten the impression that they are not entirely suitable. Just get a big bag and test them? Oregon, land of magnificent stumps.

In stock at mouser. Discussion in ‘ Solid State ‘ started by RuxmanJul 29, Without more info it’s hard to say what was original. There are no adjustment points for DC offset in this amp. Dr 2sb88Jul 29, Those are about as close as you can get.

IMO the s2b688 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.

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2SB688 Datasheet

That’s enough increase in 2ab688 to provoke HF instability in some amp circuits, so the repair definitely should be checked for parasitic oscillation. It arrived today, and now the amp works again. OverLoadJul 29, Please identify the amp model, so this thread will be useful to future readers. I ordered a new TIP transistor 2db688 starting this thread. Back to original question. RuxmanAug 4, If anybody is interested, here’s a schematic of the amp GIF, kB. Also, a small 1uF cap had exploded on this channel.


BinaryMikeJul 29, What about getting proper output transistors?

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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. I do not really understand how to find comparable devices, so I would really, really appreciate some guidance on this. BinaryMikeAug 4, Maybe that is why it has been smoked? I do intend to get the proper transistors soon, this was just a test. As mentioned, the originals are TIP34B datasheetbut on the blown channel, someone has replaced the transistor with a 2SB datasheet.

Thanks a lot for the help! This is very educational and fun for me.