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Old 7th April 2010, 07:48 AM   #1
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Default Tube/Mosfet 100W Hybrid Amplifier

This is circuit of Counterpoint SA100.
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Old 7th April 2010, 12:38 PM   #2
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Have any DIY expirience with similar schematics?
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Old 7th April 2010, 12:46 PM   #3
ilimzn is offline ilimzn  Croatia
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With all due respect, if you had EVER had anything to do with that amplifier, you would be ashamed to post it's schematic here. It's notoriously unreliable and simply put, badly engineered (if you could call that design proces enginering) - and with all due respect to the moderators, it's been said multiple times.
It is time for this schematic to be forgotten!

And yes, i have experience with this particular amp as well as with 3 other hybrids, and one of my own design. The point of designing it was that the other 3 were just not that good.

Last edited by ilimzn; 7th April 2010 at 12:49 PM.
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Old 7th April 2010, 12:59 PM   #4
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Quote:
Originally Posted by ilimzn View Post
With all due respect, if you had EVER had anything to do with that amplifier, you would be ashamed to post it's schematic here. It's notoriously unreliable and simply put, badly engineered (if you could call that design proces enginering) - and with all due respect to the moderators, it's been said multiple times.
It is time for this schematic to be forgotten!

And yes, i have experience with this particular amp as well as with 3 other hybrids, and one of my own design. The point of designing it was that the other 3 were just not that good.
Thank U for information, I have no expirience with this amplifier. Any link?
Regards Mile
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Old 17th April 2010, 04:10 PM   #5
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Default Tube/Mosfet Output Stage

Output stage for hibryd amplifier. Not tested, I'm working on tube VAS.
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Old 17th April 2010, 04:29 PM   #6
qsa is offline qsa  Germany
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I mean IRFP240/9240 are not really complementary devices, it sound horribile in mosfet amp...... BJT Design Sound better compare to IRFP240/9240

we have test it in Mosfet amp and in my opinion IRFP240/9240 is no go in mosfet amp

Last edited by qsa; 17th April 2010 at 04:32 PM.
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Old 17th April 2010, 04:40 PM   #7
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Quote:
Originally Posted by qsa View Post
I mean IRFP240/9240 are not really complementary devices, it sound horribile in mosfet amp...... BJT Design Sound better compare to IRFP240/9240

we have test it in Mosfet amp and in my opinion IRFP240/9240 is no go in mosfet amp
Very strong opinion, but I do some blind test: with same VAS on both channel useing 2SC5200/2SA1943 on left, and IRFP240/IRFP9240 on right channel.
Result:
Nobody hear difference.
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Old 17th April 2010, 11:23 PM   #8
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Can anybody suggest some tube VAS, I prefer ECC88, (exempt Counterpoint SA100)
Thank's

Last edited by apexaudio; 17th April 2010 at 11:29 PM.
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Old 17th April 2010, 11:54 PM   #9
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Quote:
Originally Posted by qsa View Post
I mean IRFP240/9240 are not really complementary devices, it sound horribile in mosfet amp...... BJT Design Sound better compare to IRFP240/9240

we have test it in Mosfet amp and in my opinion IRFP240/9240 is no go in mosfet amp
I and others have found the IRFP240/9240 combination to work very well.
I can only speak for my own designs but I have found them to work very well.
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Old 18th April 2010, 12:08 AM   #10
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A simple way to do it is to take an SRPP valve front end and ac couple it to a classs AB MOSFET amplifier.
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