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Old 26th December 2004, 03:58 AM   #1
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Default power transistor output capacitance


to every one who knows. does an output capacitance (Cop)
of a power transistor affect sonic performance?
from experience, 2sc2922 and its complementary have 250pf
on their specs while MJL4281 and its complementary have 600pf on their specs (Cop). I have one amplifier here at home, this is the P400 hifi I got from www.epanorama.net ( thanks to its contributor )
I have been using this thing for 4 years. for the outputs I used MJL4281 (NPN) AND MJL4302(PNP) and i have a friend here using the same amp but different output devices, 2SC2922 (npn) and 2sa1216 (pnp), through listening tests both amp sounds real good but
dynamic bass reproduction are different, using the output devices
mentioned: the amp (my friend's amp) using 2SC2922 and 2SA1216
slightly dominates and sounds heavier (meaning more dynamic bass) than the amp ( my amp ) using MJL4281 and MJL4302.
Or are there any other transistor characteristics involved?
during these tests same CD player and pre-amp are used.
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Old 26th December 2004, 06:52 AM   #2
djk is offline djk
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What V and how many outputs?

The MJL4281/4302 are for use in multiples only, an amp with only one pair would be better off with MJ21193/94.

For the NPNs the 21194 has a higher Ft than the 4281 at currents above 4A (32W at 4R).
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Old 26th December 2004, 07:01 AM   #3
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Default capacitance

hi djk

actually i'm using four 4281's at positive rails and four 4302's at negative rails (70-0-70)dc , this power supply might be safe enough for these outputs.
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Old 26th December 2004, 07:18 AM   #4
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Default wait!!!



as i can remember do you have some schematics for CREST
PRO AMPS? I wish , you can share me a copy of it for reference purposes.
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