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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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(PDF) 2SB737 Datasheet download

Maybe he, or another ilumanted member of this forum can bring some other substitutes! Very nice that Mr. The 2SA from Toshiba is an excellent super low Rbb transistor, but it has become scarce. I have not searched the other parts mentioned in this thread, but also with web search i didnt found a “recommended” replacement. A am wondering what Midas is using or their XL42 preamp now. You can buy small quantities on the web I still have some back in my lab. June 06, 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.

Is there anything to consider changing resistor values etc. Roberts joins the thread! The 85 looks identical except for higher breakdown voltage than 84 so no problem with either. There are some newer substitutes that aren’t as low R’bb but are acceptable in general microphone preamps.


I looked around briefly this afternoon and didn’t see anything obvious The -E parts are higher beta than the -D. Is there any equivalent for this? Perhaps they are protecting against some latch up condition.

You probably have two of those per mic input. Transistor substitution question Started by jrmintz The Lab.

Transistor substitution in GAR Maybe they have REAL much in stock. Yup, they have been obsolete for years.

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

April 01, I don’t remember what transistor Peavey switched to. You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is.

Other observations about the schematic, the diode across the uF looks a little odd. Regular transistors will be noisy in this application; I don’t daasheet the NTE part, but I doubt it is a super low Rbb part.

Thank you very much I was already off the reservation when Peavey made their lifetime buy on datasheeg. If you sub a newer part, you may want to back off on the current density for optimal noise performance or not. Those are super low Rbb transistors for low Z input stages. Rossi Member Germany Posts: February 18, Bookkeeper Member Czech Republic Posts: In the schematic there are 2 2sb Started by maxime The Lab.

Low noise devices are generally graded for beta, as in the more beta the better for low noise eatasheet. March 29, But look at the data sheets for NF vs daatasheet curves, for something that doesn’t suck into ohms.

February 26, Also on this forum are some threads about this part, but no conclusion what to use instead. The original Rohm transistors are discontinued; if you can’t source any, try the 2SA or, not quite datasheeg low noise but still pretty good, 2N Looking forward to some results! Hi all, looks like two of the channels of my mixing console were fried when a phantom power coupling capacitor blew up.


I’ve used the npn counterpart 2SC with good results. I typically would have run the 2sb at a little higher current density. As we all know the 2SB has dagasheet 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. Started by abby normal The Lab. Change both transistors in the input stage. Hi Have these transistors in bad Delta channel.

Rossi probably knows more than I do about what folks are using these days. I also want to know if there is dattasheet good modern replacement for the 2sb out there.

2SB Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

No simple fix to avoid the scratchy noise with gain changes due to small DC offsets, but you might want to experiment with datasheeg quality there. One weak link sonically for that design is the uF cap in the gain leg My stash of s are from my design work back in the ’70s, before I worked at Peavey.

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