2SB737 DATASHEET PDF
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.
The 85 looks identical except for higher breakdown voltage than 84 so no problem with either. It will work but you’ll have more noise.
You can buy small quantities on the web I still have some back in my lab. The 2SA from Toshiba is an excellent super low Rbb transistor, but it has become scarce. Transistor substitution in GAR No simple fix to avoid datasjeet scratchy noise with gain changes due to small DC offsets, but you might want to experiment with cap quality there.
Hi all, looks like daatasheet of the channels of my mixing console were fried when a phantom power coupling capacitor blew up.
But I wouldn’t change it here for two reasons.
Transistor substitution question Started by jrmintz The Lab. Rossi probably knows more than I do about what folks are using these days. You are about to become the voice of Interplanetary Parliament.
(PDF) 2SB737 Datasheet download
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. Perhaps they are protecting against some latch up condition. February 26, I also want to know if there is a good modern replacement for the 2sb out there. First increasing current there, will decrease input datashheet 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.
Thank you very much Started by maxime The Lab. The -E parts are higher beta than the -D. But that will not last for ever. Is there any equivalent for this? My stash of s are from my design work back in the ’70s, before I worked at Peavey.
I was already off the reservation datxsheet Peavey made their lifetime buy on that. Those are super low Rbb transistors for low Z input stages. A am wondering what Midas is using or their XL42 preamp now. If you sub a newer part, you may want to back off on the current density for optimal noise performance or not. That design looks like around 1 mA nominal set by ohm and Vbe of 2sc March 29, Started by jrmintz The Lab.
Also on this forum are some threads about this part, but no conclusion what to use instead.
One weak link sonically for that design is the datasheer cap in the gain leg 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. Low noise devices are generally graded for beta, as in the more beta the better for low noise applications.
But look at the data sheets for NF vs impedance curves, for something that doesn’t suck into ohms. 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.
2SB Datasheet – Transistors, Bipolar, Si PNP Low-Power from ROHM Co.
Rossi Member Germany Posts: I don’t remember what transistor Peavey switched to. Roberts joins the thread!
2SB Datasheet, PDF – Alldatasheet
Yup, they have been obsolete for years. You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is. 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. They were using truck loads of the 2sd NPN version. 22sb737 looked around briefly this afternoon and didn’t see anything obvious