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Old 23rd November 2012, 07:27 PM   #11
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Originally Posted by maouna View Post
class A will create much heat and there will be the need for big heatsinks........
Are you sure about what you want?
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Old 23rd November 2012, 08:08 PM   #12
tinitus is offline tinitus  Europe
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I think the ideal for me would be jean hiraga's ''le monstre'' .......
may I ask, based on what ?
reading old threads ?
not there is anything wrong in that, but...

though, I see one advantage of the small 8watt
it doesnt need much of anything

btw, if those are your speakers, they look like they are powered speakers
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Old 23rd November 2012, 08:21 PM   #13
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Default I have tried Hiraga once

And i like it.... not hundred percent but i like it...a good try.

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Carlos
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Old 23rd November 2012, 08:27 PM   #14
jaycee is offline jaycee  United Kingdom
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a big problem with le monstre and indeed any amp that has fets in it's input, is getting the fets... they are practically unobtanium unless you are willing to go to the ends of the earth for them, or gamble on ebay
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Old 23rd November 2012, 09:00 PM   #15
maouna is offline maouna  Greece
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yes the speakers are powered with internal amplifier but i want to add an external amp
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Old 23rd November 2012, 09:08 PM   #16
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Build some good speakers first.
The ones you show deserves no more than the chip amps inside.
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Old 24th November 2012, 12:09 AM   #17
Bigun is offline Bigun  Canada
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Carlos - that's an interesting observation because Class A no-feedback tube amplifiers are often reported to sound louder and it is usually explained by their soft clipping but I never heard of a SS amp with feedback being accused of sounding louder before.

A Class AB 'blameless' is also my vote - like the one I made and linked in my post above. It was designed for low voltage rails. At really low voltage rails things need a bit of care because you start to lose some headroom and the LTP benefits from a current source like Lineup shows rather than the resistor I used.
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Old 24th November 2012, 06:16 PM   #18
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My experience with recent small speakers is that they are now very inefficient, like 80-84 dB/W/1m, though this is hidden by their being fitted with dedicated amplifiers and not being required to disclose sensitivity.

Some small "professional" powered speakers with 5" woofers seem to require two 40W chips in each box. Because they need to trade off so much mid/treble sensitivity for bass, frankly, I don't think you'll quite get the power you may need there. Your 15W plan seems more promising. Just aim to do whatever an LM1875 chip does in discrete format and you should be on target for a wide range of small commercial boxes.
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Old 25th November 2012, 11:39 AM   #19
maouna is offline maouna  Greece
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I should aim at something like classic 3 stage topology like Bigun and Lineup mentioned before.This is my design but then comes in mind some more questions like:should i use current mirror in LTP? or a buffer in VAS? or some kind of cascode?or Sziklai output due to lower quiscent current than EF output? or they are to much for such a simple application?
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Old 25th November 2012, 11:45 AM   #20
maouna is offline maouna  Greece
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Sorry,values are not clear enough.Here's a new image.
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