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Old 4th August 2002, 09:37 PM   #1
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Cool Gutting Out An Bose 1801 Amp

Hello Everyone,
I have been reading the posts and have decided to attempt to build a Aleph or Zen.I have a Bose 1801 amplifier that fried one channel and the sub that was connected to it.I want to use the chassis and heatsinks and junk box the rest.Any suggestions on what amp Aleph or Zen I could build in the chassis?
Sincerely,
Cambe
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Old 4th August 2002, 09:47 PM   #2
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Tell us the size of the heatsink.
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Old 4th August 2002, 11:15 PM   #3
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Default 1801 Haetsink Size

Hello dshortt9,
I will send a picture as soon as I can figure out how to. The heat sink is an L shape.
l l l l l l l
_
_
_
_
_
_
The short leg is 6" long 6.375" tall and the height of the fins are1.25" with base of heatsink 2".The long leg 14.25" Long,6.375" high and same fin depth.The fin spacing is.625"and where the L forms a right angle theirs a fin at a 45 degree angle that looks like trees that I use to draw in the first Grade.I hope this helps.
Thank you,
Cambe
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Old 4th August 2002, 11:45 PM   #4
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If one channel still lives you might fire the amp up look at the
rail voltage and measure the bias in the chanel that still lives.
Then if you can find the bias adjustmant pot you might raise the bias till the heatsink starts to get hot and get an idea about
the thermal capacity from there.

regards bob12345678
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Old 5th August 2002, 12:41 AM   #5
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Default 1801 voltage / bias measurements

Hello bob 12345678,
I am a newbie in true sense of the word. Remembering,how powerful the amp sounded driving Bose 901 series ones listening to Egar Winter's, Frankenstien at listening levels I dare not today.Plus, that awful sound I heard the Sunday morning while having breakfast and listening to FM radio,along with "what's that smell"I ran to the den where my rig is and my right channel sub's woofer was sticking out like a zit.I have just taken the cover off of the beast and confirmed my earlier suspicsions.The transformer is 7.5" in dia. and about the same in height.Their is 2 -14,000 mF/ 100v capacitors 3"x 5.375".It still smells.It would have set the house on fire if I hadn't pull the plug when I did.I don't trust plugging the thing in.
Cambe
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Old 5th August 2002, 06:53 PM   #6
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A Bose 1801 should support 200 watts rms, which is
OK for 60+ watts total of Zen or Aleph. (1 X 60 or 2 X 30 )
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Old 5th August 2002, 08:28 PM   #7
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Default Gutting Out An Bose 1801 Amp

Hello Everyone,
And thank you very much,Mr. Pass.I now know that I can at least get to try one of your designs.Now which one should be suitable following your guidelines,Zen or Aleph?
Sincerely,
Cambe
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Old 5th August 2002, 09:07 PM   #8
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My suggestion would be an Aleph 3 as you could make a stereo amp on one chassis. PCB available here. http://web.vip.hr/pcb-design.vip/ matched FET's here: Anyone else need more matched IRFP240/9610's

Good luck!
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Old 5th August 2002, 10:40 PM   #9
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If you can tap the Bose transformer to 240 V input and
operate it at 120V, you might be able to use it.
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Old 5th August 2002, 11:35 PM   #10
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Any drawbacks to such use of transformer Mr Pass? I was thinking about using trafo from A75 for Aleph X in that way. High power, low voltage is hard to get without going custom.
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