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Old 4th December 2010, 10:12 PM   #1161
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,iss_man

thanks for the scope pic

can you tell me what's the supply voltage when the amp cliped?

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Originally Posted by niss_man View Post
Here is a couple of oscillascope readings of my Blame ST at near clipping and also at clipping. Using 100w 7.5ohm resistor as a load. It had 21.7v ac rms just before clipping so therefore 63w at 7.5ohm load.

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Niss_man
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Old 4th December 2010, 11:29 PM   #1162
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This amp has a gain of 26. So 21.7/26= 0.83v ac input. Supply rails are +/- 36V dc.
You can see the input as the blue colour. Supply rails as green and red (with little bit of ripple from max power usage) and output as yellow line. Supply and output at 10v per division and input at 2v per division. All the information is there.

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Niss_man
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Old 5th December 2010, 02:57 AM   #1163
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Quote:
Originally Posted by niss_man View Post
Here is a couple of oscillascope readings of my Blame ST at near clipping and also at clipping. Using 100w 7.5ohm resistor as a load. It had 21.7v ac rms just before clipping so therefore 63w at 7.5ohm load.

Regards

Niss_man
Nice O-scope I can't clip mine , no load big enough or speaker big enough to handle it ... But your waveform shows the EXACT reverse of my simulated "ES like" amp (below 1 - 70V rails). This is expected as mine is reversed (bootstrap negative). This shows the simulator reproduces the saturation errata perfectly.

With my 75V rails, my CD/soundcard can not clip the amp even with a 38DB gain , I guess your picture is the only time I will ever see it.
OS
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Old 5th December 2010, 08:12 AM   #1164
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Carlos may have some more scope pictures? I am not sure.
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Old 5th December 2010, 08:31 AM   #1165
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Quote:
Originally Posted by niss_man View Post
Carlos may have some more scope pictures? I am not sure.
I thank you for those , I really can not get to clip. I would not want to at that power level. Me and MJL21193 just limit total gain where any source input will not drive the amp to clipping (2v rms in = 77v rms out- way too much!!) I trim the input so my woofer won't "bottom out".

I was just curious to see if anything did blow at clipping , you did it and survived. BTW , carlo's amps are the champs with both the sound and for the number people. BX is my favorite sound- wise (ES/st based - below)
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Last edited by ostripper; 5th December 2010 at 08:34 AM.
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Old 5th December 2010, 08:49 AM   #1166
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I used 2 x 15 ohm resistors rated at 50w. So 7.5ohm 100w resistor. Signal generator used for input. Total output of the amp was 62w. Nothing blew. output resistors got really hot though. May need a bigger test resistor heat sink rather than some scrap aluminium.

Regards

Niss_man
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Old 5th December 2010, 10:18 PM   #1167
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do you have any plan for testing blmae amp with 4 ohm load?

btw:
listening impression please

Quote:
Originally Posted by niss_man View Post
I used 2 x 15 ohm resistors rated at 50w. So 7.5ohm 100w resistor. Signal generator used for input. Total output of the amp was 62w. Nothing blew. output resistors got really hot though. May need a bigger test resistor heat sink rather than some scrap aluminium.

Regards

Niss_man
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Old 5th December 2010, 11:29 PM   #1168
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I need a 4ohm resistor maybe 200w so I can't at the moment. My impressions have been written previously, but again. I have heard the Blame amplifiers called "Friendly" and this I whole heartedly agree on. There is no harshness on the ears anywhere in the frequency range. You get a reproduction as it intended to be. The amps are a pleasure to listen too and are going to be my yardstick to which all others are measured for years to come. There is plenty of power to drive my speakers to very loud levels. I have made a comparison video between ES and ST amps below.

YouTube - Blame ES vs Blame ST

Regards

Niss_man
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Old 7th December 2010, 10:21 AM   #1169
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Default Mitchel tested the Dx Blame ST

YouTube - Amplificador DX Blame ST

YouTube - DXBLAMEST

YouTube - Placa de proteção para alto-falantes

YouTube - Surto de Corrente

You have some videos having Brazilian Portuguese language narrative.... but some folks from France, Spain, Portugal and several American countries can understand.

regards,

Carlos
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Old 7th December 2010, 10:36 AM   #1170
Salas is offline Salas  Greece
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You got to design a kit speaker tested and approved by you for going nice with the DX amps series and offer to the fans at a point Carlos. Maybe with Selenium units. Enough of the speakers I some times see on videos can't reveal your amps as much as they deserve in my humble opinion.
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