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Old 14th December 2009, 10:38 AM   #11
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BV: thank you for the right keyword.
About number 3.2 (Device Parameters) of the weblink
Semiconductor Safe Operating Area
there is a description about perforated emitter (also called mesh emitter) designs.
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Old 14th December 2009, 11:09 AM   #12
wahab is offline wahab  Algeria
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i have some sanken MN2488/MP1620 ,
darlingtons with fairly good perfs,
the datasheet says MOLD TYPE transistors...
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Old 15th December 2009, 09:23 AM   #13
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BV,
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Lumba, You are joking?
I am certainly not.
ON-Semi (and other western manufacturers) has never had the interest nor the skills to make anything beyond switch transistors, which necessarily require different properties than transistors for linear amplification.
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Old 15th December 2009, 10:05 AM   #14
BV is offline BV  Slovakia
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Look here, please:
SET
This is set of (quite simple and conventional) amplifier measurements with two pairs "switching" transistors MJL21193/21194..I used thousands of those transistors in last 10years..And You?
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Old 15th December 2009, 10:25 AM   #15
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Quote:
Originally Posted by BV View Post
Look here, please:
SET
This is set of (quite simple and conventional) amplifier measurements with two pairs "switching" transistors MJL21193/21194..I used thousands of those transistors in last 10years..And You?
Pretty good measurements. What amplifier is that?
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Old 15th December 2009, 11:29 AM   #16
BV is offline BV  Slovakia
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Newer version of this:
BV Audio P1 Preamplifier, PA300 Power Amplifier home listening test
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Old 15th December 2009, 11:46 AM   #17
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Quote:
Originally Posted by blueskynis View Post
Pretty good measurements. What amplifier is that?
I think this one:
PA300 and in english
http://translate.google.de/translate...n&hl=&ie=UTF-8
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Old 16th December 2009, 07:56 AM   #18
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BV,
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I used thousands of those transistors in last 10years..And You?
I try to stick to Japanese devices, offering a significantly higher performance and manufacturing technology. Itīs been my firm conviction for more than 10 years.
Nice measurements, unfortunately, they donīt say anything about the sound.
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Old 16th December 2009, 08:10 AM   #19
BV is offline BV  Slovakia
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Japanese devices, offering a significantly higher performance and manufacturing technology. Itīs been my firm conviction for more than 10 years.
So, You can for sure show some proofs about this claim? Better linearity? Better SOAR? What is better? Or only feelings and Your ears?
I tried Japenese devices too, but decided to use ONsemiīs
BTW, fortunately ,sound is the same as measurements. Nice and pleasant.
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Old 16th December 2009, 08:22 AM   #20
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Quote:
Originally Posted by BV View Post
So, You can for sure show some proofs about this claim? Better linearity? Better SOAR? What is better? Or only feelings and Your ears?
I tried Japenese devices too, but decided to use ONsemiīs
BTW, fortunately ,sound is the same as measurements. Nice and pleasant.
As you can read about number 4 from post #1 of this thread, On-Semi offers both kind of power devices: such with 4 MHz and such with the usual values from that one "made in japan". It would be interest to know, how explain the Onsemi engineers the pro and cons by practical use in power amplifier in audio.

Unfortunately I don't find a comparable test in the web between this two kinds of power devices both at pure class A mode and by AB mode with 20-50 mA through the output
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