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Old 27th August 2011, 05:08 AM   #481
AKSA is offline AKSA  Australia
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Nico,

It has only four stars because I have not yet accessed it 10k times.

But I'm working on it......

Hugh
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Old 27th August 2011, 09:12 AM   #482
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Exclamation SSA BIGBT Basic

Here we have the SSA BIGBT Basic complete package for all potential builders. Enjoy.
Attached Images
File Type: jpg SSA BIGBT BASIC 1.1.jpg (596.7 KB, 1268 views)
File Type: jpg SSA BIGBT BASIC PCB.jpg (373.7 KB, 1246 views)
Attached Files
File Type: pdf SSA BIGBT BASIC 1.1ALL[1].pdf (111.8 KB, 442 views)
File Type: pdf SSA BIGBT BASIC 1.1 BW PCB[1].pdf (37.2 KB, 393 views)
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Old 27th August 2011, 09:31 AM   #483
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Quote:
Originally Posted by moschfet View Post
Hi Lazy Cat,


I had a similar circuit with IRF620/IRFP620 and i had problems with a stable BIAS.

I also would make thicker traces for the power-BJT in the layout.

But I like your circuit
SSA BIGBT Basic had a change +/-20% bias change from 24-75C.

I think the traces are just fine for the estimated power levels. Of course it would be better to have thicker traces.

Thanks, it sounds very good.
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Old 27th August 2011, 09:36 AM   #484
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Quote:
Originally Posted by a.wayne View Post
Yes the schematic of the real amplifier we have enuff small amps around here, when can we see the scaled up version ...


The Big one .....
I am working on this one.
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Old 27th August 2011, 09:40 AM   #485
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Quote:
Originally Posted by Idefixes View Post
Hi Lasy Cat, i have a bunch of MJL3281/1302 laying around. I take a look at SC5359/SA1987 datasheet and they seems to me to quite near on MJL characteristics, only toshiba cob is 360pf as Onsemi cob is 600pf the reste is quite the same. Do you think they could be good candidate for SSA BIGBT?
I have a pair of 300Va 2x25V laying under bench as a pair of 200x200x40mm heatsink too. These could be a good begining for SSA BIBGT

Regards Marc
You can use yours as well. Pay attention to NPN/PNP hFE matching within BIGBT.
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Old 27th August 2011, 09:44 AM   #486
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Quote:
Originally Posted by terranigma View Post
It would be great if Alex prepare an extra PCB for all-japan bjt devices with respecting Nico's circuit.

I wonder why all pcbs have power supply unit? Is there reason for that amplifier should be close to power unit? If it is not mandatory, PCBs should be bare in my opinion.
For 50 Watt-ers it is reasonable to have power supply on board, so you only have to connect transformer, speaker and input. Some kind of builder's friendly version.
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Old 27th August 2011, 09:48 AM   #487
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Quote:
Originally Posted by Nico Ras View Post
I wonder why this thread only have four stars? Have you all voted or is there something missing?
Because people think that you and me are joking around with schematics. But if they would have a chance to listen to SSA I think the situation would change dramatically.
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Old 27th August 2011, 09:50 AM   #488
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Quote:
Originally Posted by Nico Ras View Post
MiiB I successfully built the one that you are referring to last year in Decmeber, it sounded stunning and is currently my main listening amplifier.
Nico, can you please make any sound comparison to SSA, are they close?
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Old 27th August 2011, 09:51 AM   #489
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Quote:
Originally Posted by AKSA View Post
Nico,

It has only four stars because I have not yet accessed it 10k times.

But I'm working on it......

Hugh
You're welcome Hugh.

BTW I sent you PM.
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Old 27th August 2011, 11:16 AM   #490
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Quote:
Originally Posted by Lazy Cat View Post
You can use yours as well. Pay attention to NPN/PNP hFE matching within BIGBT.


Hi Lasy Cat thanks for response.

I look at my MJL Stock and can use these 8 unit for BIGBT

Click the image to open in full size.

I have done HFE/VBE mesure at 55mA

Marc
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