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Old 13th September 2003, 05:04 AM   #1
bqc is offline bqc  United States
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Join Date: Dec 2002
Default Son of Zen amp for sale

amp is stereo and is built per Nelson pass schematic. All The components
are screwed onto one of the heatsink. A exact 2nd heatsink
is screwed onto the first one in such a way that the
top part of the Dale 50W resistor (the yellow bar seen in the
picture) is touching the 2nd heat sink. The 2nd heatsink
therefore takes almost 1/2 the heat away, leaving 1/2
to the 1st heatsink. All the input /output wires are ready
to be hooked up. All you need to do is add speaker output
binding posts and RCA input jack and soldered the wires to them
and the amp will be ready. The piece of plywood is there
for you to mount your speakers binding post and RCA jacks.
the terminal strips allow you to hook the amp to external
DC source.
I am asking $90 for the amp. The 2 heatsinks alone are worth
$75. Shipping is additional, the amp is heavy , about 20 lbs.

I also built a power supply for it, see attached picture. It
uses 2 torroid, one for each channel. Each toroid is rated
at 225VA. 18-0-18V which after rectification and filtration comes
out to about 26-0-26V. There are 8 caps, each cap is 15,000 UF.
Nelson Pass SOZ design spec has table that specfies amp
output wattage based on supply voltage, and if I remember
correctly, this one is designed to put out 10-15 Watts per channel.
The power supply uses heavy duty aircore inductor (red collor round shape in picture) for pi filtering as suggested in
SOZ design spec. I am also asking $90 for the power supply.
It is also heavy aboug 20 lbs and shipping is additional.
Attached Images
File Type: jpg soz1.jpg (31.3 KB, 402 views)
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Old 13th September 2003, 05:08 AM   #2
bqc is offline bqc  United States
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Join Date: Dec 2002
Here another shot.
THe amp size is about 17 X 7 X 7
When in full operation, the heatsink are warm to touch, but not
unbearable because I can leave my hands on the heatsinks
for a long time.
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File Type: jpg soz2.jpg (25.0 KB, 386 views)
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Old 13th September 2003, 05:13 AM   #3
bqc is offline bqc  United States
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Join Date: Dec 2002
another shot
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Old 13th September 2003, 05:14 AM   #4
bqc is offline bqc  United States
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Join Date: Dec 2002
another shot , straight on, you can see the 2 heat sink
pressed together with the resistor and mosfet in between
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Old 13th September 2003, 05:17 AM   #5
bqc is offline bqc  United States
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power supplyl
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Old 13th September 2003, 05:19 AM   #6
bqc is offline bqc  United States
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psu closed up
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Old 13th September 2003, 05:20 AM   #7
bqc is offline bqc  United States
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front view of psu
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