Bob Cordell Interview: BJT vs. MOSFET - Page 13 - diyAudio
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Old 24th November 2006, 07:01 PM   #121
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Quote:
Originally posted by G.Kleinschmidt
Wavebourn:
Also, I can distinguish natural sibiliant consonants from distorted.




Man, I don't even know what sibiliant consonants are, but that sounds impressive. I can identify between the 400Hz and 1kHz test tones of my RF amp test rig without looking at the frequency switch.....usually.

Am I similarly gifted?
Even more gifted than the rest of people who don't care of spectral analyzing and other measurements, they just say: "I don't know why, and don't want to know why, but this sounds more natural than that".
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Old 24th November 2006, 08:25 PM   #122
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Glen, the MJL21193 series devices are interesting for certain applications. For example, if I wanted to make a really powerful woofer amplifier for a PA or even a high end audio system. Motor drives would be ideal for this device.
It isn't 'perfect' for high frequency reproduction, but I am pretty sure from past experience that I could make an acceptable power amp with a slew rate of 50-100V/us with these devices. The Levinson ML-2 power amp (JC-3) used similar devices, e.g. the 2N5684 and 2N5884 series.
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Old 24th November 2006, 08:50 PM   #123
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Quote:
Originally posted by Bob Cordell
One thing that I had not adequately kept up with is some of the developments in newer switchmode MOSFET technology, particularly in regard to so-called Trench FETs. These are quite different from the IRFP240 type planar power MOSFETs we have usually used, and indeed appear to be less suitable for use in linear circuits.

Bob

http://powerelectronics.com/mag/Ely%...2004%20PET.pdf
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Old 24th November 2006, 09:04 PM   #124
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I prefer 2SA5200/2SC1943, up to 3A per device.
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Old 25th November 2006, 03:18 AM   #125
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Quote:
Originally posted by lumanauw
Hi, Bob Cordell,

It can be seen that the positive part is common collector, while the negative part is common emitor usage mode of output transistors, so it is not balanced between positive and negative half.

Yes the negative part is CE, but if you apply a current feedback to its driver and it performs just like a CC type with low Z.....
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Old 25th November 2006, 03:23 AM   #126
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Quote:
Originally posted by john curl
Glen, the MJL21193 series devices are interesting for certain applications. For example, if I wanted to make a really powerful woofer amplifier for a PA or even a high end audio system. Motor drives would be ideal for this device.
It isn't 'perfect' for high frequency reproduction, but I am pretty sure from past experience that I could make an acceptable power amp with a slew rate of 50-100V/us with these devices. The Levinson ML-2 power amp (JC-3) used similar devices, e.g. the 2N5684 and 2N5884 series.

I agree, John. Sounds reasonable to me.

Bob
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Old 25th November 2006, 08:38 AM   #127
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Quote:
Originally posted by Bob Cordell



I agree, John. Sounds reasonable to me.

Bob

What reasonable....Glen has made its point and we are waiting to see something excellent from your side too BOB...all the forum members are just curious about the Mosfet Vs BJT debate....
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Old 25th November 2006, 11:35 AM   #128
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Quote:
Originally posted by Workhorse



...all the forum members are just curious about the Mosfet Vs BJT debate....
HI.

The thread seems in danger of deteriorating ..............


Can someone comment on the hybrid output pair, as posted by Wavebourne in post 12.??

Does this not give the best of both worlds??

Andy
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Old 25th November 2006, 12:58 PM   #129
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Best of the both worlds give cascode connection of Mosfet + BJT, as was shown in TAA by authors Pass/ Hagard....
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Old 25th November 2006, 01:50 PM   #130
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Wavebourne:
Even more gifted than the rest of people who don't care of spectral analyzing and other measurements, they just say: "I don't know why, and don't want to know why, but this sounds more natural than that".



Mate, I donít know if Iím reading you correctly here or not, but I was only joking around Ė didnít mean to offend. I was mostly poking fun at my own incompetence at subjective audio evaluation. Iím not particularly musically talented. When it comes to amplifier evaluation, specifications and measurements mean more to me than personal subjective evaluations.

Cheers,
Glen
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