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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Hi Have these transistors in bad Delta channel.

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. Change both transistors in the input stage.

You probably have two of those per mic input. Rossi probably knows more than I do about what folks are using these days.

2SB Datasheet – Transistors, Bipolar, Si PNP Low-Power from ROHM Co.

You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is. The 2SA Hitachi that I pointed out earlier is a popular replacement used in quite a few preamp stages that previously had the 2SB August 16, Looking forward to some results! Also on this forum are some threads about this part, but no conclusion what to use instead.


Hi all, looks like two of the channels of my mixing console were fried when a phantom power coupling capacitor blew 2sn737. Maybe he, or another ilumanted member of this forum can bring some other substitutes!

2SB737 Datasheet, Equivalent, Cross Reference Search

But I wouldn’t change it here for two reasons. In the schematic there are 2 2sb The original 2sb and 2sD were designed for moving coil head amps with ohm nominal source impedance, so arguably better than datsheet for ohm source impedance microphones.

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.

Bookkeeper Member Czech Republic Posts: 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 Transistor substitution question Started by jrmintz The Lab.

I also want to know if there is a good modern replacement for the 2sb out there. Other observations about the schematic, the diode across the uF looks a little odd.


2SB737 Datasheet

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. Very nice that Mr.


I don’t remember what transistor Peavey switched to. That design looks like around 1 mA nominal set by ohm and Vbe of 2sc But look at the data sheets for NF vs impedance curves, for something that doesn’t suck into ohms.

It will work but you’ll have more noise. The -E parts are higher beta than the -D. Roberts joins the thread! Thank you very much One weak link sonically for that design is the uF cap in the gain leg Started by maxime The Lab.

2SB Datasheet, PDF – Alldatasheet

Is there anything to consider changing resistor values etc. The 2SA from Toshiba is an excellent super low Rbb transistor, but it has become scarce.

I looked around briefly this afternoon and didn’t see anything obvious They were using truck loads of the 2sd NPN version. I typically would have run the 2sb at a little higher current density. The number sounds familiar Looking at the noise figure curves wrt source impedance and current density here javascript: