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Old 27th July 2005, 11:51 AM   #1
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Default Sumo Andromeda III Settings

I have a blown channel on a Sumo Andromeda III
It uses IRFP240/IRFP9243 combo. The 9243's are no longer available and IR recommends the IRFP9240 as a replacement.
I cant find any data sheets on the 9243 to compare. This is a fully balanced amplifier in which the output gnds. are not grounded to chassis. I have seperate bias & null adjustments for each side of balanced amplifier for one channel. I dont trust the settings on the good channel and looking for recomendations on bias. I believe the null is set 0 to ground on each side and not between + & - since this is fully balanced.
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Old 27th July 2005, 06:04 PM   #2
dimitri is offline dimitri  United States
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this is distortion null not dc null, dc is nullified by servo

http://www.datasheetarchive.com/semi...asheet=1003197
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Old 27th July 2005, 06:06 PM   #3
dimitri is offline dimitri  United States
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Old 1st August 2005, 02:33 AM   #4
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Default Schematic

Thanks for the datasheets
Whats the chance of a schematic or bias/null settings for this amp?
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Old 1st August 2005, 12:46 PM   #5
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Default Re: Sumo Andromeda III Settings

Quote:
Originally posted by johnsciolino
This is a fully balanced amplifier in which the output gnds. are not grounded to chassis. I have seperate bias & null adjustments for each side of balanced amplifier for one channel. I dont trust the settings on the good channel and looking for recomendations on bias. I believe the null is set 0 to ground on each side and not between + & - since this is fully balanced.

Several Sumo amps were designed by James Buongiorno. You could trying asking him about the settings:

jamesbongiorno@ampzilla2000.com

In any case his balanced amps were in fact bridged amps, so I don't know if it's accurate to call them balanced amps.

And I think null & bias was carried out separately on each side of the bridge.

There should be some information on the web, but I failed to find it just now.


Carlos
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Old 1st August 2005, 02:27 PM   #6
dimitri is offline dimitri  United States
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Quote:
should be some information on the web
http://home.kimo.com.tw/skychutw/Cir...ndromedaII.pdf
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Old 1st August 2005, 03:08 PM   #7
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The URL seems to be outdated, as it doesn't get us where it should.

Seems to be happening a lot with most of my circuit listing places.


Carlos
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Old 1st August 2005, 03:23 PM   #8
dimitri is offline dimitri  United States
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Carlos, please open

http://home.kimo.com.tw/skychutw/Circuits/

then click on Andromeda II, it is here
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Old 1st August 2005, 03:28 PM   #9
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Quote:
Originally posted by dimitri
Carlos, please open

http://home.kimo.com.tw/skychutw/Circuits/

then click on Andromeda II, it is here

Did you try it?

If you click on any of the blue names it gets you here:

http://tw.home.yahoo.com/member/h/noreferrer.html
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Old 1st August 2005, 03:50 PM   #10
dimitri is offline dimitri  United States
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Carlos, the last one works for me

http://home.kimo.com.tw/skychutw/Circuits/
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