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Old 19th January 2011, 06:44 PM   #631
Zen Mod is offline Zen Mod  Serbia
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Burning Amplifier BA-2
Papa use that way in his FW amps ;

reason is simple - cleaner ground and prevented possible xformer buzz , in case of slightest un-symmetry of secondaries

Naim wakoos use same technique , in their amps , if I remember correctly

reasons are completely high fidelity - hard work for every little detail
result is cumulative
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Old 19th January 2011, 10:26 PM   #632
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by Backbones View Post
deliberately using more than one secondary winding each with their own diode bridges
One step further : more than one secondary with their own diode bridges, and more than one transformer per channel.

(for examples, see AMT Class A power amp models of Metronome-T)
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Old 21st January 2011, 09:35 AM   #633
Backbones is offline Backbones  United Kingdom
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Just ordered some BA-2 boards.
Have there been any design changes since the last lot?
Regards,
Chris
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Old 21st January 2011, 10:02 AM   #634
cviller is offline cviller  Canada
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It has been a while since I did the changes, so this is from an email I wrote back then:

BAGS
- Fix error ±
- Updated version number and date
- Added extra holes 120mm and 60mm apart the other way
- Size: 130x70 mm

BACO
- Increased size to 250x50
- Adjusted holes to 80mm and 5mm from board edge
- Updated version
- Deleted one set of diodes and moved the others in center
- Size: 250x50 mm

BASO
- Same as BACO
- Size: 250x50 mm

BACB
- Resized to 50x50mm
- Moved holes 5mm from edge
- Updated text
- Size 50x50 mm

BASB
- Resize to 50x60mm (difficult to get down to 50x50 due to elna silks)
- Moved holes 5mm from edge
- Updated text
- Changed the S wire routing
- Size 60x50mm
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Old 21st January 2011, 10:11 AM   #635
Backbones is offline Backbones  United Kingdom
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cviller,
Looks like a lot of hard work. Many thanks and much appreciated.
Regards,
Chris
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Old 21st January 2011, 10:13 AM   #636
cviller is offline cviller  Canada
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Basically, the main difference is that output and bias boards have become slightly larger to provide a standard for boards at diyAudio moving forward.
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Old 21st January 2011, 10:16 AM   #637
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Just broke out in a sweat when I saw the size increase but my ruler says I can still fit the boards in the chassis.
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Old 21st January 2011, 04:56 PM   #638
Forsman is offline Forsman  Sweden
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Excuse me for asking a novice question but what differs the single ended version from the complementary version? Which one is right for me?

kind regards
/Forsman
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Old 21st January 2011, 05:05 PM   #639
Zen Mod is offline Zen Mod  Serbia
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look for difference in output power
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Old 21st January 2011, 06:47 PM   #640
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And output spectra of harmonics
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