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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I don’t remember what transistor Peavey switched to. Hi Have these transistors in bad Delta channel. So I’d drop them in and see how it works. Very nice that Mr. You probably have two of 2sc22744 per mic input.

Maybe he, or another ilumanted member of this forum can bring some other substitutes! February 18, Looking forward to some results!

Rossi Member Germany Posts: Bookkeeper Member Czech Republic Posts: I looked around briefly this afternoon and didn’t see anything obvious The -E parts are higher beta than the -D. I also want to know if there is a good modern replacement for the 2sb out there. I was already off the reservation when Peavey made their lifetime buy on that. The original 2sb and 2sD were designed for moving coil head amps datashete ohm nominal source impedance, so arguably better than needed for ohm source impedance microphones.

Maybe they have REAL much in stock. In the schematic there are 2 2sb Is there anything to consider changing resistor values etc. You are about to become the voice of Interplanetary Parliament. Roberts joins the thread!


April 01, As we all know darasheet 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. March 29, Transistor substitution in GAR But I wouldn’t change it here for two reasons.

The 85 looks identical except for higher breakdown voltage than 84 so no problem with either. August 16, 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.

2SC Datasheet PDF – Sanyo

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. Thank you very much A am wondering what Midas is using or their XL42 preamp now.

That design looks like around 1 mA nominal set by ohm and Vbe of 2sc 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 them noisy.

Looking at the noise figure curves wrt source impedance and current density here javascript: Low noise devices are generally graded for beta, as in the more beta the better for low noise applications. Is there any equivalent for this?

2SC datasheet & applicatoin notes – Datasheet Archive

Change both transistors in the input stage. You can buy small quantities on the web I still have some back in my lab. I’ve used the npn counterpart 2SC with good results.


Started by abby normal The Lab. Datashset tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is. June 06, Started by maxime The Lab. My stash xatasheet s are from my design work back in the ’70s, before I worked at Peavey.

The number sounds familiar Transistor substitution question Started by jrmintz The Lab.

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.

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 The 2SA Hitachi that I pointed out earlier is a popular replacement used in quite a few preamp stages that previously had the 2SB Also on this forum are some threads about this part, but no conclusion what to use instead.

There are some newer substitutes that aren’t as low R’bb but are acceptable in general microphone preamps.

2SC2274 Datasheet

Other observations about the schematic, the datasheeh across the uF looks a little odd. Those are super low Rbb transistors for low Z input stages.

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. February 26, But that will not last for ever.