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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In the schematic there are 2 2sb If you sub a newer part, you may want to back off on the current density for optimal noise performance or not.

February 18, It will work but you’ll have more noise. 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.

If you sprinkle when you tinkle, please be neat and wipe the seat. Datashret am wondering what Midas is using or their XL42 preamp now.


2SB737 Datasheet, Equivalent, Cross Reference Search

Roberts joins the thread! Thank you very much Started by maxime The Lab. 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 up. April 01, Very nice that Mr.

2SB Datasheet PDF –

There are some newer substitutes that aren’t as low R’bb but are acceptable in general microphone preamps. Started by jrmintz The Lab.

Hi Have these 2sb7337 in bad Delta channel. You probably have two of those per mic input. You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is. Transistor substitution in GAR The number sounds familiar I typically would have run the 2sb at a little higher current density. March 29, 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 February 26, The original 2sb and 2eb737 were designed for moving coil head amps with ohm nominal source impedance, so arguably better than needed for ohm source impedance microphones.


Maybe they have REAL much in stock. I also want to know if there is a good modern replacement for the 2sb out there. One weak link sonically for that design is the uF cap in the gain leg Is there anything to consider changing resistor values etc.

Started by abby normal The Lab. That design looks like around 1 mA nominal set by ohm and Vbe of 2sc As we all datasbeet 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. Rossi Member Germany Posts: Yup, they have been obsolete for years.

Change both transistors in the input stage. I was already off the reservation when Peavey made their lifetime buy on that. They were using truck loads of the 2sd NPN version.