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Old 1st June 2009, 10:09 PM   #1
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Default SUMO Polaris Class A/B Stereo Power AMP (New to the Board)

This is my first post here, so hello to everyone.
I do a lot of Audio Recording in the live and studio environment.
I regularly post at taperssection.com

Several years ago i purchased a SUMO / Polaris A/B Stereo Power Amp off of EBAY with great expectations. However when i received it one channel was dead. With a very busy schedule and way too many active hobbies i just got around to working on the amp.

First thing i did was to open up the unit check and replace fuses and bam, one side tripped. I then did some checking and realized i was not as good at trouble shooting as i once was. (yes of course i did NOT plug the amp in without putting a dummy load on the output) Anyway i took it to a shop and it needs several new output transistors on one channel. With the cost of the transistors as much as i have already put into the amp i decided not to fix it.

So here is the bottom line: I am about to sell this thing once again on EBAY and i was wondering if anyone here had any better ideas. This is a very nice amp and i figure someone out there must have one that may need parts or someone may want a spare or a project unit.
When i was looking for info on this unit i was directed to this board and i did find several discussion's on them here.\

Thanks,
Michael
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Old 1st June 2009, 10:26 PM   #2
lineup is offline lineup  Sweden
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I am not familiar with SUMO.
But I have seen this brand mentioned at forum before.

What is the Model number or whatever?
From SUMO amplifiers ...
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Old 1st June 2009, 10:42 PM   #3
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What output transistors does it need? Someone here may be able
to help you find some.
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Old 2nd June 2009, 12:06 AM   #4
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Default Model 310

Model 310 Polaris Sumo Audio Group
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Old 2nd June 2009, 05:19 AM   #5
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it uses mosfets,
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Old 2nd June 2009, 05:59 AM   #6
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IRFP240\9240
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Old 2nd June 2009, 06:46 AM   #7
Westerp is offline Westerp  Netherlands
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Around $8 for a pair so it depends on what you paid
http://www.diyaudio.com/forums/attac...amp=1125184193
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Old 2nd June 2009, 06:46 AM   #8
lineup is offline lineup  Sweden
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Sumo Polaris, Aurora, Athena in the house
Below is a photo of a Sumo Polaris 310 power amp

topic from 2007
http://www.audiokarma.org/forums/sho...d.php?t=118995

I know I have posted something about SUMO before, in this forum.
But I do not know much of these great amplifiers he did.
sumo artemis preamplifier

http://www.diyaudio.com/forums/showt...79#post1692879
Most of the SUMO amplifiers were made by Jim James Bongiorno
... so I should search the net for HIM
and his name

Here is what this older gentlemen maybe looks now:
Click the image to open in full size.
His Homepage:
http://www.ampzilla2000.com/James_Bongiorno.html


This guy has some stuff about GAS / SUMO amplifiers
http://www.davidsaudio.com/html/gas_sumo.html
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Old 2nd June 2009, 06:48 AM   #9
taj is offline taj
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One of these has been worked on here before...

Sumo Polaris 310


..Todd
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Old 2nd June 2009, 08:44 AM   #10
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The Polaris 1st edition dates back to the beginning of the 1980s.

The choice of both opamp and output MOSFETs of the Polaris design reminds of the works of a British designer.
The same bloke accidently started his UK based business in 1982.
Fact or fiction ?
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