BD140 I/o 9610 in Aleph type front end? - diyAudio
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Old 24th March 2013, 11:13 AM   #1
The Dastardly Dad of Three
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Default 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 ?
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Old 24th March 2013, 11:23 AM   #2
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just try

be sure to have enough emiter degeneration - you really don't need all that OLG
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Old 24th March 2013, 03:49 PM   #3
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You mean just slot them in ?
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Old 24th March 2013, 04:11 PM   #4
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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
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Old 24th March 2013, 04:38 PM   #5
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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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Old 24th March 2013, 04:47 PM   #6
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I'm always onto something

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