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Old 9th May 2005, 06:24 AM   #1
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Default Wanted: DIY amplifier builder with experience. I need a 0.7 ohm stable amplifier

Hello all,

I need an amplifier to power a pair of DIY ribbons... final load should be around 1 ohm... but I'm going to say 0.7 to be safe

Any amp type will do, though class A is preferred (I know that this design is tough)... don't worry if Class A is too complicated

Linesource on here had posted several schematics to make this amp...

but again... design doesn't matter

Optimially I would like it to have as low of distortion as possible...

Requirements:
>0.01% THD
Stable daily at 0.7 ohms
2 channel amplifier
gain control knob
input and output RCAs/XLR/.25" microphone (any of these... not all)
35-55 watts per channel (ideally on the high end)

mosfets are fine, as all are topographies... no need to build the amp case... you can just supply the put together PCB board...

Here's linesources schematic:
http://www.diyaudio.com/forums/attac...amp=1091084434

Quote me prices people and thank you in advance
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Old 9th May 2005, 03:05 PM   #2
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You can use this good old amp:
Krell KSA 50 pcb
Just have the person making it for you to add lots of output devices
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Old 9th May 2005, 04:53 PM   #3
Mark Kravchenko --- www.kravchenko-audio.com
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Default Start with the basics

If you need a board made you can drop me a line. But there are ready made boards for the amp ACD posted.

Making an amp is not that hard. I have a huge inventory of heatsinks. And you can get the rest as you need.

Mark
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Old 9th May 2005, 05:09 PM   #4
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Quote:
Originally posted by ACD
You can use this good old amp...Just have the person making it for you to add lots of output devices
I currently have three devices per rail. I'll see how low I can drive it later this week!

What sort of power do you need? I imagine 5-10w should be more than enough if your sensitivity is that good. That means the rail voltage can be dropped significantly from the 35-40V used in the current prototypes.

Board orders will be taken soon.
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Old 9th May 2005, 06:53 PM   #5
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Quote:
Originally posted by pinkmouse


I currently have three devices per rail. I'll see how low I can drive it later this week!

What sort of power do you need? I imagine 5-10w should be more than enough if your sensitivity is that good. That means the rail voltage can be dropped significantly from the 35-40V used in the current prototypes.

Board orders will be taken soon.

10 watts would work... but I would like 25-35 for overhead...

are you willing to make me one?

I understand all those schematics I don't know if I have the skills to make it.... I can try I guess
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Old 9th May 2005, 06:57 PM   #6
Variac is offline Variac  United States
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Hey guys,
Do the Alephs work for this? They are supposed to be stable into a dead short but I don't know how they sound when doing so. . If so, then there are a couple of group buy circuit boards floating around this forum.
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Old 9th May 2005, 07:46 PM   #7
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Quote:
Originally posted by ACD
You can use this good old amp:
Krell KSA 50 pcb
Just have the person making it for you to add lots of output devices
If that is .7 ohm stable.... sure they can use that.... any design that's out there they can copy... as long as it meets my specs...


any takers??

I will pay well....
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Old 9th May 2005, 09:02 PM   #8
Mark Kravchenko --- www.kravchenko-audio.com
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Default How soon do you need it?

Send me a private email about the particulars and I will get back to you. You may have a taker.

Mark
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Old 9th May 2005, 11:20 PM   #9
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Default Re: How soon do you need it?

Quote:
Originally posted by mwmkravchenko
Send me a private email about the particulars and I will get back to you. You may have a taker.

Mark

need it about 2 months... YGM
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Old 10th May 2005, 01:23 AM   #10
Mark Kravchenko --- www.kravchenko-audio.com
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Default Now we need a carrot

Quote:
need it about 2 months... YGM
OK now what?

MArk
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