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Old 9th May 2012, 06:37 AM   #2531
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Quote:
Originally Posted by fredlock View Post
Andrej, would this be the final design of the SSA? Are you going to offer a group buy soon? Hoping that it will happen, since it looks interesting and I think everybody is also waiting. I tried your simple SSA BIBGT version but wasn't so successful. The DC offset wasn't stable and everytime I turn on, it keeps on changing. I didn't have time to play with it since suddenly I became busy at work. I might just wait and try your final version, which you said it's reliable and stable.
Yes, obviously from latest layout this is not anymore simple but rather complex design, still symmetrically based but without any stability issues.
The purpose of this and TSSA thread was more or less educational fun, initiation to fellow members to build something on their own, make tests, measurements, etc. Group buy was really never a main objective here, but if design proves to be reliable and if there will be an interest, we can sort it out something in that direction.
Listening tests so far revealed the SSA is a good sounding amp, but it was never directly compared to the other DIY amps but allways to commercial designs.

Regards Andrej
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Old 9th May 2012, 07:06 AM   #2532
Jay is offline Jay  Indonesia
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Originally Posted by Lazy Cat View Post
TSSA with two pairs of Hex-Fet, can you point me to the schematic and info you've stated, than I can comment and be responsible for calculation mistakes.
Have you tried using hexfet?? I believe you have not. Because once you use it I believe you will notice that HEXFET-TSSA has that potential. Please build it. A quick build, "vanilla" or basic HEXFET-TSSA will not outperform F5 at first Watts, but it shows its strength at higher power. That's why I said that this amp is very useful.

A workaround on the input stage (which is TSSA weakness) current source and power supply will bring the amp to another league (the performance at higher power will just follow the performance at first watts).

I think one of the reason is because the circuit requires good symmetry and thus complementary choice. I started with IRF632/9630 so I don't know if other pairs could be better or worse. But IRF640/9540 outperformed IRF640/9640 for example (Notice the choice of the complementary).

That's why I have a hope for lateral K2221/J352 in TSSA because I believe this pair is better complement each other than K1058/J162. But unfortunately I don't have the model for those.

Cmon, try it yourself. I'm not the only one who have heard the amp. We prefer the TSSA over F5.
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Old 9th May 2012, 07:47 AM   #2533
Jay is offline Jay  Indonesia
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Originally Posted by Jay View Post
That's why I have a hope for lateral K2221/J352 in TSSA because I believe this pair is better complement each other than K1058/J162. But unfortunately I don't have the model for those.
But I believe that if the circuit is designed for K1058/J162, as long as the symmetry is maintained (meaning that it should not use different variable R for both positive and negative sides) then dropping in K2221/J352 will improve things, assuming that it has better symmetry characteristics.
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Old 9th May 2012, 08:48 AM   #2534
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Quote:
Originally Posted by Jay View Post
Have you tried using hexfet??
...
Cmon, try it yourself. I'm not the only one who have heard the amp. We prefer the TSSA over F5.
Well I use IRFs as drivers in BIGBT outputs, but I guess that's not the same of what you're thinking (Hex-Fets). Can you please note exact type of Hex-Fet you have on your mind.

Regarding TSSA & SSA, I also noticed sound homogeneity at all power levels, not a trace of any sound character change. Why else for me to bother with this amp again, making new PCB, if there wouldn't be something very appealing about it I already experienced?

Little comment on TSSA input BJTs, of course there's major improvement in distortions (sound too) if you implement cascoded Sziklai/Baxandall for the input pair - personally tested and very pleased with the results. But anyway TSSA super basic is just a working starter to trigger someone's imagination and brainstorm activity.
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Old 9th May 2012, 09:06 AM   #2535
Jay is offline Jay  Indonesia
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Originally Posted by Lazy Cat View Post
Well I use IRFs as drivers in BIGBT outputs, but I guess that's not the same of what you're thinking (Hex-Fets). Can you please note exact type of Hex-Fet you have on your mind.
Post#1. Only IRF is used instead of 2SK/SJ. Of course one resistor must be changed to accommodate higher Vgs threshold.
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Old 9th May 2012, 03:35 PM   #2536
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Quote:
Originally Posted by Lazy Cat View Post
Yes, obviously from latest layout this is not anymore simple but rather complex design, still symmetrically based but without any stability issues.
The purpose of this and TSSA thread was more or less educational fun, initiation to fellow members to build something on their own, make tests, measurements, etc. Group buy was really never a main objective here, but if design proves to be reliable and if there will be an interest, we can sort it out something in that direction.
Listening tests so far revealed the SSA is a good sounding amp, but it was never directly compared to the other DIY amps but allways to commercial designs.

Regards Andrej
Thanks for your reply. I just don't have the talent to do pcb layout. It would be nice if you can share your pcb design on pdf format, so I/we can etch our own board?

Definitely you will hear more feedback on the performance of the amp since there will be more DIYers that will try building the amp, like for example Leach, Symasym, FETzilla, Pass amps and etc. I presume most of the DIYers here in the forum (like me) just want to build, listen and compare. If I like it, I keep it. If not, then I move on to what comes next.
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Old 25th May 2012, 12:47 PM   #2537
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Smile SSA BIGBT HP Sold

Hi guys

Just to inform you that last week we plug SSA into high-end mastering system in a recording studio for Jazz, free Jazz, Ethno and Electronica specialists and consequently SSA stayed connected.

So I made a formula: SSA + TSSA = CSA and new PCB (pic) went into production.

After assembly and testing I will start the new CSA thread.

Stay well and have fun building amps, regards Andrej
Attached Images
File Type: jpg SSA Klopotec.jpg (653.3 KB, 580 views)
File Type: jpg CSA BIGBT HP.jpg (568.5 KB, 545 views)
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Old 25th May 2012, 12:57 PM   #2538
mikelm is offline mikelm  England
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is CSA 2 or 3 stage ?
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Old 25th May 2012, 02:10 PM   #2539
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3 stages (input, vas, output), global current feedback, +/-62V output rails, all-in-one PCB, just connect the transformer and play
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Old 25th May 2012, 03:13 PM   #2540
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We should definetaly need one SSA/TSSA/CSA impressions thread. LC, you should also think opening LC Facebook fanpage
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