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Old 25th May 2012, 12:01 PM   #601
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I cannot open spreadsheets as i do not own a license of the office package.

Also do NOT say something is worthless like that without providing actual links to the suggested papers, i have no clue where to find these and google offers little help.

Last edited by Tekko; 25th May 2012 at 12:03 PM.
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Old 25th May 2012, 12:02 PM   #602
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Quote:
Originally Posted by Tekko View Post
I cannot open spreadsheets as i do not own a license of the office package.
Download the free OpenOffice package and you will be able to open it
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Old 25th May 2012, 12:31 PM   #603
AndrewT is offline AndrewT  Scotland
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The links are already on the Forum.
Both contributors are Forum Members.
The SOA you have shown is of no worth to any reader.
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Old 25th May 2012, 12:54 PM   #604
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How can the soa test i show be meaningless ?!

Thats just what soa is, a certain current through the device at a certain voltage across C and E.

If this is not the case, then you show what correct meaningful soa is, because im not gonna waste time searching the forum trying to find these papers you claim to exist here.

Sure you could take the current and voltage and calculate the equavilent resistance of the transistor and from that calculate how much it dissipates and see if its exceeding the max dissipation rating as well as taking thermal derating into account, but still.
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Old 25th May 2012, 01:31 PM   #605
AndrewT is offline AndrewT  Scotland
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Look up some of the temperature de-rated SOAR plots that have been posted.
If you can't be bothered, then so be it.
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Old 25th May 2012, 01:55 PM   #606
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Everything in this picture tells me the symef amp will gladly do 4 ohms with 50V rails all day long, the 2 ohm resistor represents the lowest impedance a 4 ohm speaker could potentially drop to. I used a 1Hz sine as its frequencies below 20Hz that poses the biggest threat to the output devices.

In reality due to voltage drops through the triple deep darlington drive, the amp will not even be able to get up to this kinda power, nor will the power supply allow it.

Also my symef amp will be force air cooled at all time so it shouldent even rise enough in temp to get into the soar derating area, besides if temp goes up beyond a preset value, a guard circuit will kick in and bring the fan up to full speed, and if temp still rises, the main power will be cut automatically, and come back on once the amp is back at room temp.

link to fullsize picture: http://i.imgur.com/eBDJG.png
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Old 25th May 2012, 09:55 PM   #607
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Originally Posted by OnAudio View Post

@ Evette

Tell us more, was your performance comparison interms of
1. Wattage
2. Listening tests (tell us more also)
3. T.H.D.

Not forgetting plastics crackup under pressure. Am assuming here the Leach has TO3 devices. (Was their a difference in power supplies ?)
Quote:
Originally Posted by AndrewT View Post
What does "at high power the Leach takes it out." mean?

Is it a Leach Lo Tim or a Leach Double Barrel?
12 fits with Double Barrel, 10 only fits with Lo Tim.
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Originally Posted by fredlock View Post
Evette, can you tell us how the sound quality compared to DX Amp, since you already compared it to the LEACH Amp? If you say it's better, then I will give it a shot.
After going through a few proofs. Someone needs to provide more info on this.
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Old 26th May 2012, 03:59 PM   #608
c12mech is offline c12mech  United States
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Boards arrived yesterday. It may be a little bit before I can do much testing. I'm being paid to build a dac for someone and that has priority. Some profit from dac goes to amp projects which is a good thing.
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Old 26th May 2012, 04:31 PM   #609
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Thanks C12Mech Looking forward to it.
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Old 29th May 2012, 06:29 PM   #610
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Default help

Is there anyone out there ?

I have a confession to make. I love you guys. I enjoy the teasing, the fights, the complements, the contradictions, the corrections,the team work, the intelligent discussions, the bla. Its a great way to get cheap therapy for everyone as well as enjoy the state of the art in audio
At the beginning many including, Andrew, Cal(in his own silent way ), Nico(and his entourage ), the lazy cat (can he catch a mouse ) used to keep me excited, worked up and healthy, but now I stare out the open window with a longing look in my eye.

Well I guess once you get ontop of the food chain........

Last edited by OnAudio; 29th May 2012 at 06:53 PM.
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