BD140 I/o 9610 in Aleph type front end?

kasey197 · 24th March 2013, 11:13 AM

I compared the BD140 vs the 9610 on a curve tracer and noted the dramatically higher transconductance on the BJT compared to the MOSFET. I don't have much experience with BJTs but they look like a nice upgrade to the 9610s on this front - before I go about making a complete *** of myself - can I just sub them into a aleph type diff pair front end ? Am I missing something obvious ?

Zen Mod · 24th March 2013, 11:23 AM

just try

be sure to have enough emiter degeneration - you really don't need all that OLG

kasey197 · 24th March 2013, 03:49 PM

You mean just slot them in ?

Zen Mod · 24th March 2013, 04:11 PM

yup

say 22R for Re are good for start

though , I'll toss at least 100mA through LTP , these days , whatever is choice of biguns for it

decreasing Rd(Rc) accordingly

kasey197 · 24th March 2013, 04:38 PM

Oooo 100ma thru an input LTP ? That at least 5 times more than has ever been done afaik but maybe you're onto something there zm ....

Zen Mod · 24th March 2013, 04:47 PM

I'm always onto something

24th March 2013, 11:13 AM	#1
kasey197 The Dastardly Dad of Three diyAudio Member Join Date: Sep 2009	BD140 I/o 9610 in Aleph type front end? I compared the BD140 vs the 9610 on a curve tracer and noted the dramatically higher transconductance on the BJT compared to the MOSFET. I don't have much experience with BJTs but they look like a nice upgrade to the 9610s on this front - before I go about making a complete *** of myself - can I just sub them into a aleph type diff pair front end ? Am I missing something obvious ?

24th March 2013, 11:23 AM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	just try be sure to have enough emiter degeneration - you really don't need all that OLG __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

24th March 2013, 04:11 PM	#4
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	yup say 22R for Re are good for start though , I'll toss at least 100mA through LTP , these days , whatever is choice of biguns for it decreasing Rd(Rc) accordingly __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

24th March 2013, 04:47 PM	#6
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	I'm always onto something __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

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24th March 2013, 03:49 PM	#3
kasey197 The Dastardly Dad of Three diyAudio Member Join Date: Sep 2009	You mean just slot them in ?

24th March 2013, 04:38 PM	#5
kasey197 The Dastardly Dad of Three diyAudio Member Join Date: Sep 2009	Oooo 100ma thru an input LTP ? That at least 5 times more than has ever been done afaik but maybe you're onto something there zm ....

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