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Old 31st January 2013, 12:49 PM   #2831
sajti is offline sajti  Hungary
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My new amplifier under construction.

Sajti
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Old 31st January 2013, 12:51 PM   #2832
Telstar is offline Telstar  Italy
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Looking good... Which amp is?
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Old 31st January 2013, 12:53 PM   #2833
sajti is offline sajti  Hungary
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Something like the output stage of Marantz SM11, but slightly redesigned.

Sajti
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Old 31st January 2013, 01:45 PM   #2834
sajti is offline sajti  Hungary
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Another picture.

Sajti
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Old 15th February 2013, 10:16 AM   #2835
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Quote:
Originally Posted by Bonsai View Post
Here are so0me pictures of my latest amplifer. You can read about it on my website.

Very nice
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Old 22nd February 2013, 11:36 AM   #2836
Bonsai is offline Bonsai  Taiwan
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Thank you. Nice website you have BTW

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Old 22nd February 2013, 08:16 PM   #2837
Bensen is offline Bensen  Belgium
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I'm proud to present my very first amp which is totaly of my own hand, offcourse with the help of a lot of people on this forum!

The enclosure is made of:
- back and front: Weng wood (front 28mm, back 18mm)
- side panels: 4 heatsinks from hifi2000, 200*165*40mm
- topside: 6mm glass
- bottom: 8mm HPL plate
- input connector: neutrik RCA (only thing I found to mount on a 18mm thick plate.
- output connectors: rhodium plate, very heavy connectors.

The amp consists of:
- soft start
- 650VA/2x35V amplimo toroidal
- 2 sets of Power supply: each with 4 HFA25PB60 rectifiers and 40000F capacitance.
- 2 ampflifiers boards: 2SA872/2SC1775 as diff amp, 2SC1845/2SA992 as VAS, 2SK216/2SJ79 as drivers, 3pairs matched 2SK1530/2SJ201 as OPS
- 2 DC servo's and with start up DC-offset compensation (DC-servo is made very slowly with purpose)
- 1 output protection made with TA7317 chip


I started with the design in oktober 2011:
Amp design for subwoofer and wideband duty

Sound: I don't have many experience with other amps. I have a Denon PMA700 amp which can't beat this amp. The first boards/circuit I made was worse sounding than the Denon amp. With the current circuit, the amp has a lot more detail and imaging than the Denon.
Attached Images
File Type: jpg SAM_1107 comp.JPG (140.7 KB, 1057 views)
File Type: jpg SAM_1108 comp.JPG (154.6 KB, 982 views)
File Type: jpg SAM_1109 comp.JPG (152.1 KB, 897 views)
File Type: jpg SAM_1110 comp.JPG (152.7 KB, 565 views)
File Type: jpg Final schematic Upgrade.JPG (235.8 KB, 670 views)
File Type: jpg SAM_0972 comp.JPG (237.7 KB, 691 views)
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Old 23rd February 2013, 11:35 AM   #2838
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Benny,
Very nice can I come over to listen?
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Old 24th February 2013, 04:38 AM   #2839
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Location: Montreal
Very nice work Bensen!

Looks really professional!

Do
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Old 24th February 2013, 06:53 AM   #2840
davecj is offline davecj  United States
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Default todays system now yesterdays

Hi
New to diy saying hello.
Smoked the amp last week so removed the 3250b too and replaced with yamaha ca1000. And swapped the tuner with Kenwood 8300. Running b&w dm3000s for now.
Putting together something using yamaha mx2000 maybe the rest all digital. Looking at pre's and dac's while have plenty about that needs repair to stay busy.
weeee
davej
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