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27th July 2005, 11:51 AM
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#1 |
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diyAudio Member
Join Date: Aug 2004
Location: florida
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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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27th July 2005, 06:04 PM
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#2 |
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diyAudio Member
Join Date: Oct 2002
Location: retired
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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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1st August 2005, 02:33 AM
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#4 |
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diyAudio Member
Join Date: Aug 2004
Location: florida
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Schematic
Thanks for the datasheets
Whats the chance of a schematic or bias/null settings for this amp? |
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1st August 2005, 12:46 PM
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#5 | |
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diyAudio Member
Join Date: Mar 2001
Location: Brazil
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Re: Sumo Andromeda III Settings
Quote:
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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1st August 2005, 02:27 PM
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#6 | |
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diyAudio Member
Join Date: Oct 2002
Location: retired
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Quote:
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1st August 2005, 03:23 PM
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#8 |
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diyAudio Member
Join Date: Oct 2002
Location: retired
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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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1st August 2005, 03:28 PM
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#9 | |
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diyAudio Member
Join Date: Mar 2001
Location: Brazil
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Quote:
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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1st August 2005, 03:50 PM
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#10 |
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diyAudio Member
Join Date: Oct 2002
Location: retired
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