Elektronische Bauelemente 2SC A, 60 V NPN Plastic Encapsulated Transistor RoHS Compliant Product A suffix of “-C” specifies halogen & lead-free . The 2SC is manufactured in a plastic TO case. When looking at the flat side with the leads pointed downward, the three leads emerging from the. 2SC datasheet, 2SC pdf, 2SC data sheet, datasheet, data sheet, pdf, Unknow, LOW FREQUENCY POWER AMP APPLICATIONS.

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Thank you very much First increasing current there, will decrease input signal swing before saturation, unless you change other values, but more importantly, I suspect the newer replacement devices are higher Rbb and happier at lower current density. I usually added clamp diodes backwards across the be junction of the low noise devices to make sure they never zener if reversed, as that can make datassheet noisy.

June 06, Rossi Member Germany Posts: You can buy small quantities on the web I still have some back in my lab. Transistor substitution question Started by jrmintz The Lab. I was already off the reservation when Peavey made their lifetime 2sc22274 on that. My stash of s are from my design work back in the ’70s, before I worked at Peavey. In the schematic there are 2 2sb The number sounds familiar Rossi probably knows more than I do about what folks are using these days.

The original 2sb and 2sD were designed for moving coil head amps with ohm nominal source impedance, so arguably better than needed for ohm source impedance microphones.


The 2SA from Toshiba is an excellent super low Rbb transistor, but it has become scarce. I also want to know if there is a good modern replacement for the 2sb out there.


So I’d drop them in and see how it works. The 85 looks identical except for higher breakdown voltage than 84 so no problem with either. I’ve used the npn counterpart 2SC with good results. I typically would have run the 2sb at a little higher current density. 2sc22774

As we all know the 2SB has practically become extinct so I thought I’d follow Rossi’s recommendation and have them replaced by 2SA actually 2SA which I can get at my local dealer. You probably have two of those per mic input.

But that will not last for ever. Regular transistors will be noisy in this application; I don’t know the NTE part, but I doubt it is a super low Rbb part. Transistor substitution in GAR The original Rohm transistors are discontinued; if you can’t source any, try the 2SA or, not quite as low noise but still pretty good, 2N There are some newer substitutes that aren’t as low R’bb but are acceptable in general microphone preamps.

Perhaps they are protecting against some latch up condition. It will work but you’ll have more noise. Started by jrmintz The Lab. Looking at the noise figure curves wrt source impedance and current density here javascript: Very nice that Mr.

February 26, The 2SA Hitachi that I pointed out earlier is a popular replacement used in quite a few preamp stages that previously had the 2SB Yup, they have been obsolete for years. Hi Have these transistors in bad Delta channel. Change both transistors in the input stage.


Those are super low Rbb transistors for low Z input stages. February 18, Bookkeeper Member Czech Republic Posts: I don’t remember what transistor Peavey switched datashret.

2SC2274 Datasheet, Equivalent, Cross Reference Search

But look at the data sheets for NF vs datasgeet curves, for something that doesn’t suck into ohms. That design looks like around 1 mA nominal set by ohm and Vbe of 2sc Maybe they have REAL much in stock. I have not searched the other parts mentioned in this thread, but also with web search i didnt found a “recommended” replacement.

Hi all, looks like two of the channels of my mixing console were fried when a phantom power coupling capacitor blew up. Is there any equivalent for this? Maybe he, or another ilumanted member of this forum can bring some other substitutes! But I wouldn’t change it dtasheet for two reasons.

If you sprinkle when you tinkle, please be neat and wipe the seat.

Substitution for a transistor 2SB

Roberts joins the thread! Started by maxime The Lab.

The -E parts are higher beta than the 2sc2274. Looking forward to some results! They were using truck loads of the 2sd NPN version.

Also on this forum are some threads about this part, but no conclusion what to use instead.