June 7, 2019 posted by

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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That design looks like around 1 mA nominal set by ohm and Vbe of 2sc Yup, they have been obsolete for years. March 29, Looking forward to some results! A am wondering what Midas is using or their XL42 preamp now.

Thank you very much Very nice that Mr. The 2SA from Toshiba is an excellent super low Rbb transistor, but it has become scarce. August 16, My stash of s are from my design work back in the ’70s, before I worked at Peavey. There are some newer substitutes that aren’t as low Datzsheet but are acceptable in general microphone preamps.

2SC2274 – NPN Plastic Encapsulated Transistor

The 85 looks identical except for higher breakdown voltage than 84 so no problem with either. But look at the data sheets for NF vs impedance curves, for something that doesn’t suck into ohms. Looking at the noise figure curves wrt source datashet and current density here javascript: 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.


They were using truck loads of the 2sd NPN version. Roberts joins the thread!

Change both transistors in the input stage. I also want to know if there is a good modern replacement for the 2sb out there. If you sprinkle when you tinkle, please be neat and wipe the seat. Bookkeeper Member Czech Republic Posts: No simple fix to avoid the scratchy noise with gain changes due to small DC offsets, but you might want to experiment with dataseet quality there. Also on this forum are some threads about this part, but no conclusion what to use instead.

It will work but you’ll have more noise.

The 2SA Hitachi that I pointed out earlier is a popular replacement used in quite a few preamp stages that previously had the 2SB Maybe they have REAL much in stock. Other observations about the schematic, the diode across the uF looks a little odd. Rossi daasheet knows more than I do about what folks are using these days. I looked around briefly this afternoon and didn’t see anything 2sc22274 Low noise devices are generally graded for beta, as in the more beta the better for low noise applications.


Perhaps they are protecting against some latch up condition. Those are super low Rbb transistors for low Z input stages. You probably have two of those per mic input. 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.

But that will not last for ever. Transistor substitution question Started by jrmintz The Lab. Maybe he, or another ilumanted member of this forum can 2sv2274 some other substitutes!

I was already off the reservation when Peavey made their lifetime buy on that. Hi Have these transistors in bad Delta channel.

2SC 데이터시트(PDF) – SeCoS Halbleitertechnologie GmbH

The -E parts are higher beta than the -D. I typically would have run the 2sb at a little higher current density. You are about to become the voice of Interplanetary Parliament. The original Rohm transistors are discontinued; if you can’t source any, try the 2SA ddatasheet, not quite as low noise but still pretty good, 2N