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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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HyperionAug 4, Your name or email address: You must log in or sign up to reply here. Oregon, land of magnificent stumps. RuxmanJul 29, TIP33 and 34 are still available – should use the “C” version v. Any help would be really appreciated! Thanks for the advice 2zb688 far. Dynaco used TIP transistors in several of their designs.

Is it likely that any of these could be causing a high dc-offset?

2SB Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

Back to original question. I ordered a new TIP transistor before starting this thread. Man, it is difficult to find these output transistors. Dr TinearJul 29, Please identify the amp model, so this thread will be useful to future readers.

And finally, 2SC or 2SC Now, with your insight, I looked again and found something of great interest! Without more info it’s hard to say what was original.

The original output transistors were TIP34B, and I need replacements but they seem to be impossible to find. Can be found at most electronic distributors. Yes, my password is: Do you already have an account?


But I have no way of making sure they are matched. The 2sb has a higher voltage rating, and the is rated at higher current. In stock at mouser. 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. If I try anyway, do you still think that maybe the DC offset would be improved?

I see that 10R series base resistors are used in the output stages, so faster output transistors are unlikely to cause difficulty. BinaryMikeAug 4, However, the DC offset is very high. There are seven transistors in total on each power amp section. It’s an OEM amp I do intend to recap it, but I fatasheet don’t want to have any false hope over this getting fixed by that.

This is very educational and fun for me. RuxmanAug 4, What about getting proper output transistors?

How do you get matched pairs of transistors normally? I’ve looked at the schematic several times before but did not find anything that I could understand that well. 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.


If anybody is interested, here’s a schematic of the amp GIF, kB. BinaryMikeJul 29, Thank you for the suggestions. And then there are three more, I have not looked at them because they dataseet hard to reach, but according to the schematic they are either: That’s enough increase in speed to provoke HF instability in some amp circuits, dataheet the repair definitely should be checked for parasitic oscillation. That confirms that the TIPs are not original!

Some are probably very. They spec’d 2SB and comp 2SD as suitable as well. I do intend to get the proper transistors soon, this was just a test.

2SB688 Datasheet

Tip 35C and 36C are higher powered versions and are still available. Those are about as close as you can get. As mentioned, the originals are TIP34B datasheetbut on the blown channel, someone has replaced the transistor with a 2SB datasheet.

I have an amp with a blown channel. Or is this caused by another part in the circuit? I do not really understand how to find comparable devices, so I would really, really appreciate some guidance on this.