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Old 27th April 2012, 05:47 AM   #2481
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LC, by the way, I haven't really established the ground setting. I'm thinking using the remaining big portion into ground plane by using jumper connection of wires. Which point should I take off from ? bottom center is a good choice ? (where junction of trafo & reservoir)
How will the 1uF paralleled would help ? (curiosity ~ !)
As for to filter ripples from supply rail, should I use a 1uF or 0.1uF cap ?

And how to determine the amount of bias for driver ?
Regards, Leong.
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Old 27th April 2012, 08:57 AM   #2482
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Thumbs up me too

Quote:
Originally Posted by mikelm View Post
...I think my next build with be with separate voltage gain stage & Zero FB follower o/p stage - balanced throughout - I feel like trying a radically different topology
I am in

my about SSA: great design but the secret of good sound is current NF
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regards, Pawel
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Old 27th April 2012, 09:09 AM   #2483
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Quote:
Originally Posted by padamiecki View Post
I am in

my about SSA: great design but the secret of good sound is current NF
Thanks, agree totally.
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Old 27th April 2012, 09:15 AM   #2484
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Hi guitar 89

I suggest you to use double "battery" pack power supply (separate +Vcc-00, -Vcc-0), GND meeting point on a PCB.

Driver's bias current usually set to class A regarding their output "drive" current to the next stage.

Last edited by Lazy Cat; 27th April 2012 at 09:33 AM.
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Old 27th April 2012, 01:00 PM   #2485
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Quote:
Originally Posted by Lazy Cat View Post
Hi guitar 89

I suggest you to use double "battery" pack power supply (separate +Vcc-00, -Vcc-0), GND meeting point on a PCB.

Driver's bias current usually set to class A regarding their output "drive" current to the next stage.
I'm using single transformer for 2 channel, so I suppose I have to branch out each lead into 2 for each channel ? If I were to meet both secondary's 0V to form ground, then how will be the further connection form the ground ?

About the bias, I assume class A range is the Driver's half maximum output ? Is it roughly 75mA for 100W, 25mA for 50W ? (just guessing the amount... how to calculate/estimate the driver's drive current)
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Old 27th April 2012, 05:16 PM   #2486
Sheldon is offline Sheldon  United States
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Housekeeping added. Next step is mount to regular heatsink, test, then second channel:

Sheldon
Attached Images
File Type: jpg SSA Simple Thermaltrak.JPG (39.7 KB, 634 views)

Last edited by Sheldon; 27th April 2012 at 05:24 PM.
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Old 1st May 2012, 12:30 AM   #2487
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Exclamation SSA BIGBT HP finished amplifier

I started this thread 9 months ago (how symbolic), continuing from here and today I finally made an amplifier that is finished, tested and auditioned to my friends.

It was a big pleasure making SSA BIGBT HP, learning process all the way, meeting new friends on the forum and continuing to develop new amps in TSSA thread.

Some pics from today's assembly and later music session in a system consisting of Clearaudio Ovation, MC Cartridge Stradivari V2, Nano Phono Preamp, Absoluta Talia stereo preamplifier, Magico V3 speakers, Ktema speakers.

Regards, Andrej
Attached Images
File Type: jpg SSA1.jpg (434.7 KB, 455 views)
File Type: jpg SSA2.jpg (480.0 KB, 404 views)
File Type: jpg SSA3.jpg (490.1 KB, 395 views)
File Type: jpg SSA4.jpg (434.0 KB, 372 views)
File Type: jpg SSA5.jpg (545.4 KB, 213 views)
File Type: jpg SSA6.jpg (649.4 KB, 233 views)
File Type: jpg SSA7.jpg (589.3 KB, 220 views)
File Type: jpg SSA8.jpg (566.3 KB, 202 views)
File Type: jpg SSA9.jpg (647.3 KB, 238 views)
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Old 1st May 2012, 12:54 AM   #2488
Sheldon is offline Sheldon  United States
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Superb design and craftsmanship! Wow!

BTW my latest iteration above, mounted on a proper heat sink is thermally well behaved. Driver bias goes quickly to 9.5mA, then over several seconds to about 11mA. Over the next few minutes it hits a maximum of about 12mA, then settles over the next few minutes back to about 11mA where it stays. DC offset changes a maximum of +/- 15mA, and settles within +/- 10mA. All quite acceptable.

Next is channel two, then plug it into the main system for a listen. Will probably take me a few weeks, between other things.

Sheldon
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Old 1st May 2012, 12:56 AM   #2489
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Hey man, I think that painting is a bit crooked.
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Old 1st May 2012, 05:21 AM   #2490
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Congrats LC! This amp looks better than many commercial.
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