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Good ~100W amplifier
Good ~100W amplifier
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Old 9th October 2004, 06:02 AM   #11
sam9 is offline sam9  United States
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By all acounts the Opti-MOS is very, very good but It may be over kill (size and complexity) for 100W. I've done Elliot's P101 and find it quite good. Even for 100W I used two pairs of output devices in order to improve heat transfer - I like my amps cool. Assembly was quite easy.

I also like the configuration of mounting the PCB flat against the heatsink with the MOSFETS sandwiched in between. This makesmounting in the enclosure very space efficient with the result that the rest of the amp internals are easy to layout.

My only criticsm is that the value of the input cap it too low 1uF. Unfortuneatly there isn't space to substitute a significantly higher vale metal film cap. This leaves you only two practical alternatives: no cap (dircet coupled) or a high value (~47uF) bi-polar electro.
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Old 9th October 2004, 06:11 AM   #12
Greg Erskine is offline Greg Erskine  Australia
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Good ~100W amplifier
Originally posted by percy
...looks like AKSA might not fit the budget .
Get a second job.
Sell one of the kids (if you have any).
Pawn the tele.
Beg in the streets.

Greg Erskine
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Old 9th October 2004, 10:46 AM   #13
AndrewT is offline AndrewT  Scotland
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You could add Crimson to your list. Their latest version 8 board(fully complementary with faster trannys) is even better than their vii which had an excellent reputation in the HiFi press. but spend plenty money on the unregulated PSU, they seem to benefit from stiff rails but the designer does NOT recommend regulation. I'm now thinking leach front end and having just read the bryston thread toying with the idea of quad complementary for the output end ( without the 3 times gain in the pre-pre-driver)
Andrew T.
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Old 9th October 2004, 03:58 PM   #14
percy is offline percy  United States
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Is the CF-MOSFET DESIGN same as the Optimos same except more power ?
What are the differences ? In design and sound ?
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Old 10th October 2004, 01:31 PM   #15
rabbitz is offline rabbitz  Australia
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I've built both the ASKA 55 and the ESP P101 and both are excellent sounding amplifiers. The price difference between them is not all that much and the ASKA does have the advantage that all the component choices have been made and you get an amp as the designer intended.

I do prefer the sound of the ASKA with it's superb imaging and ability to convey the emotion of music. It's hard to put into words but those that own ASKA's know what I'm talking about.

I still love the sound of the ESP P101 but I have to say "Vote 1 for ASKA".
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Old 3rd April 2013, 12:58 PM   #16
Karl vd Berg is offline Karl vd Berg
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Any newly DIY option?
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Old 3rd April 2013, 06:16 PM   #17
Samuel Jayaraj is offline Samuel Jayaraj  India
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