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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Is there any equivalent for this? Regular transistors will be datsheet in this application; I don’t know the NTE part, but I doubt it is a super low Rbb part. Is there anything to consider changing resistor values etc.
Substitution for a transistor 2SB
But look at the data sheets for NF vs impedance curves, for something that doesn’t suck into ohms. In the schematic there are 2 2sb I also want to know if there is a good modern replacement for the 2sb out there. Also on this forum are some threads about this part, but no conclusion what to use instead. 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.
Rossi Member Germany Posts: Very nice that Mr. You are about to become the voice of Interplanetary Parliament. 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.
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. One dataseet link sonically for that design is the uF cap in the gain leg Change both transistors in the input stage.
Maybe they have REAL much in stock. Hi Have these transistors in bad Delta channel.
I don’t remember what transistor Peavey switched to. I’ve used the npn counterpart 2SC with good results. Started by abby normal The Lab.
March 29, Bookkeeper Member Czech Republic Posts: If you sprinkle when you tinkle, please 2sbb737 neat and wipe the seat. Those are super low Rbb transistors for low Z input stages. I typically would have run the 2sb at a little higher current density.
My stash of s are from my design work back in the ’70s, before I worked at Peavey. Looking forward to some results! I looked around briefly this afternoon datashete didn’t see anything obvious Perhaps they are protecting against some latch up condition. Roberts joins the thread! I was already dztasheet the reservation when Peavey made their lifetime buy on that. That design looks like around 1 mA nominal set by ohm and Vbe of 2sc Transistor substitution question Started by jrmintz The Lab.
They were using truck loads of the 2sd NPN version.
2SB Datasheet – Transistors, Bipolar, Si PNP Low-Power from ROHM Co.
Started by maxime The Lab. June 06, The -E parts are higher beta than the -D. 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.
April 01, It will work but you’ll have more noise.
Low noise devices are generally graded for beta, as in the more beta the better for low noise applications.