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Old 13th April 2006, 09:11 PM   #11
The one and only
 
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Like discussions about what constitutes feedback or Class A,
it is necessary to define what the terms mean, otherwise you
waste all your time on semantic arguments.
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Old 14th April 2006, 01:56 AM   #12
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Looks to me as though this has already become a semantic discussion.
The entire point of calling a subgroup of parts by a particular name is to simplify analysis and discussion. It's nothing but a convenience for those who want to break a circuit down into smaller portions. The parts themselves surely don't care.

Grey
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Old 15th December 2010, 05:13 AM   #13
lgqliu is offline lgqliu  China
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Click the image to open in full size.

2SJ109+2SK60
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Old 15th December 2010, 05:06 PM   #14
frags is offline frags  Canada
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I would use LM4562 op. amp as a preamp (I have one preamp base on them).
They sound really great. Or LME49860, it's the same but can run with +-22V.
It has maximum output swing +-21V.

Last edited by frags; 15th December 2010 at 05:11 PM.
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Old 15th December 2010, 05:56 PM   #15
mos57 is online now mos57  Italy
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If you like single ended vfet amp, see my amp:

Francesco.
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File Type: bmp 2SJ28%20SE%20AMP2.bmp (146.0 KB, 355 views)

Last edited by mos57; 15th December 2010 at 06:04 PM.
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Old 15th December 2010, 07:21 PM   #16
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Quote:
Originally Posted by mos57 View Post
If you like single ended vfet amp, see my amp:
Very stylish. How does it sound?

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Old 17th December 2010, 09:33 PM   #17
mos57 is online now mos57  Italy
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Quote:
Originally Posted by Nelson Pass View Post
Very stylish. How does it sound?

Thanks much Nelson.

This amp sounds with beautiful mids and highs. It is also very detailed, but not tire, a feast for the ears. The bass is extended but not particularly fast as most single ended circuits, then primarily it has a balanced sound. Since the amplifier is medium-low power (about 12-15 W), I hope someday to be able to match with medium-high efficiency speakers (Feastrex for example) and listen female voices.
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Old 22nd December 2010, 04:36 PM   #18
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Quote:
Originally Posted by mos57 View Post
If you like single ended vfet amp, see my amp:

Francesco.
for me it would be interesting to know more about the differences in sound character by using of the good known IFFP 9240 or an other enhanced P-CH MOSFET. Are there really advantages in such a single ended power stage by use of this rare and expensive SONY V-FET instead enhanced MOSFET's?

Quote:
Originally Posted by lgqliu View Post
Click the image to open in full size.

2SJ109+2SK60
Is this a commercial product from your country? I'm still looking to commercial single ended solid state power amps - an overview you will find about
URL Collection of Commercial Single Ended Integrated and Power Amplifier Devices

Last edited by tiefbassuebertr; 22nd December 2010 at 04:42 PM.
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Old 23rd December 2010, 11:53 AM   #19
lgqliu is offline lgqliu  China
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Quote:
Originally Posted by tiefbassuebertr View Post
for me it would be interesting to know more about the differences in sound character by using of the good known IFFP 9240 or an other enhanced P-CH MOSFET. Are there really advantages in such a single ended power stage by use of this rare and expensive SONY V-FET instead enhanced MOSFET's?


Is this a commercial product from your country? I'm still looking to commercial single ended solid state power amps - an overview you will find about
URL Collection of Commercial Single Ended Integrated and Power Amplifier Devices
my english si very poor

Because no negative feedback loop circuit, using a different MOS tube out of the sound is different. In addition, this circuit is my own DIY, not manufacturers.
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Old 23rd December 2010, 12:05 PM   #20
90999 is offline 90999  China
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His mind is : " It's not product , only him in the world, And the sound is the difference between the VMOS and the VFET in NFB AMP. "
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