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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Very nice that Mr. Low noise devices are generally graded for beta, as in the more beta the 2sc227 for low noise applications. But I wouldn’t change it here for two reasons. Started by abby normal The Lab. So I’d drop them in and see how it works. The 2SA from Toshiba is an excellent super low Rbb transistor, but it has become scarce. But that will not last for ever. You probably have two of those per mic input. If you sub a newer part, you may want to back off on the current density for optimal noise performance or not.

(PDF) 2SC2274 Datasheet download

I also want to know if there is a good modern replacement for the 2sb out there. Started by jrmintz The Lab. Roberts joins the thread!

Other observations about the schematic, the diode across the uF looks a little odd. Started by maxime The Lab. Yup, they have been obsolete for years. 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.


In the schematic there are 2 2sb Also on this forum are some threads about this part, but no conclusion what to use instead. Those are super low Rbb transistors for low Z input stages.

Transistor substitution question Started by jrmintz The Lab. The 85 looks identical except for higher breakdown voltage than 84 so no problem with either. I typically would have run the 2sb at a little higher current density. I looked around briefly this afternoon and didn’t see anything obvious 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 They were using truck loads of the 2sd NPN version.

If you sprinkle when you tinkle, please be neat and wipe the seat. Just to get the channel working you could probably parallel up a few 2n per, but longer term you want to use a proper low noise part. April 01, Change both transistors in the input stage.

2SC 데이터시트(PDF) – SeCoS Halbleitertechnologie GmbH

The -E parts are higher beta than the -D. Looking at the noise figure curves wrt source impedance and current density here javascript: Transistor substitution in GAR August 16, Looking forward to some results! I’ve used the npn counterpart 2SC with good results. It will work but you’ll have more noise. March 29, I was already off the reservation when Peavey made their lifetime buy on that.

Is there anything to consider changing resistor values etc. No simple fix to avoid the scratchy noise with gain changes due to small DC offsets, but you might want to experiment with cap quality there.


Maybe they have REAL much in stock. The 2SA Hitachi that I pointed out earlier is a popular replacement used in quite a few preamp stages that previously had the 2SB Perhaps they are protecting against some latch up condition.

February 18, February 26, As we all know the 2SB has practically become extinct so I datasheet I’d follow Rossi’s recommendation and have them replaced by 2SA actually 2SA which I can get at my local dealer.

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 2cs2274 make them noisy.

2SC2274 . Datasheet. Equivalente. Reemplazo. Hoja de especificaciones. Principales características

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. You tell me whar a man gits his corn pone, en I’ll datashest you 2xc2274 his ‘pinions is.

That design looks like around 1 mA nominal set by ohm and Vbe of 2sc Rossi probably knows more than I do about what folks are using these days. June 06, I don’t remember what transistor Peavey switched to. Hi Have these transistors in bad Delta channel. Bookkeeper Member Czech Republic Posts: But look at the data sheets for NF vs impedance curves, for something that doesn’t suck into ohms.