Figure 3: rbb’ = 2Ω of 2SB I’ve found the same 2Ω value in Douglas Self’s new book “Small signal audio design”. Although the. 2SB Rohm data sheet. 2SB Silicon PNP transistor Components datasheet pdf data sheet FREE from Datasheet (data sheet) search for integrated circuits (ic). 2SB Low rbb Low Noise Amp Components datasheet pdf data sheet FREE from Datasheet (data sheet) search for integrated circuits (ic).

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Bookkeeper Member Czech Republic Posts: April 01,datashet August 16, A am wondering what Midas is using or their XL42 preamp now. There are some newer substitutes that aren’t as low R’bb but are acceptable in general microphone preamps. 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.

Yup, they have been obsolete for years. As we all know the 2SB has practically become extinct so I thought I’d follow Rossi’s adtasheet and have them replaced by 2SA actually 2SA which I can get at my local dealer. I have not searched the other parts mentioned in this thread, but also with web search i didnt found a “recommended” replacement.

They were using dataeheet loads of the 2sd NPN version.


Hi datasheeet, looks like two of the channels of my mixing console were fried when a phantom power coupling capacitor blew up. June 06, That design looks like around 1 mA nominal set by ohm and Vbe of 2sc Transistor substitution in GAR I’ve used the npn counterpart 2SC with good results. You can buy 2sg737 quantities on the web I still have some back in my lab.

If you sprinkle when you tinkle, please be neat and wipe the seat. You are about to become the voice of Interplanetary Parliament. Is there any equivalent for this?

My stash vatasheet s are from my design work back in the ’70s, before I worked at Peavey. February 18, I looked around briefly this afternoon and didn’t see anything obvious So I’d drop them in and see how it works. 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. Rossi probably knows more than I do about what folks are using these days. 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.

Substitution for a transistor 2SB

Perhaps they are protecting against some latch up condition. Started by abby normal The Lab. Low noise devices are generally graded for beta, as in the more beta the better for low noise applications. I typically would have run the 2sb at a s2b737 higher current density. Change both transistors in the input stage. The original Rohm transistors are discontinued; if you datsaheet source any, try the 2SA or, not quite as low noise but still pretty good, 2N Maybe they have REAL much in stock.


The 2SA from Toshiba is an excellent super low Rbb transistor, but it has become scarce.

(PDF) 2SB737 Datasheet download

Satasheet observations about the schematic, the diode across the uF looks a little odd. 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. Very nice that Mr. You probably have two of those per mic input.

Hi Dxtasheet these transistors in bad Delta channel. You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is. Also on this forum are some threads about this part, but no conclusion what to use instead.

Started by jrmintz The Lab. Maybe he, or another ilumanted member of this forum can bring some other substitutes!

2SB737 Datasheet, Equivalent, Cross Reference Search

I was already off the reservation when Peavey made their lifetime buy on that. Roberts joins the thread!

But I wouldn’t change it here for two reasons.

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