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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
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Old 19th December 2017, 08:30 AM   #11
astx is offline astx  Austria
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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
Very clean soldering!
One hint: first solder flat parts and last solder the highest parts.

Matching: I have matched them out of the whole batch for lowest Vbe and hFe difference. During matching with your DCA 75 pro all transistors should have the same temperature. e.g. Use a thick aluminium brick and let the transistor cool down after you have touched them. After measurement write down the number on the back side of the transistor so you can find the part after sorting your spread sheet.

Have fun, Toni
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Old 20th December 2017, 08:19 AM   #12
astx is offline astx  Austria
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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
Of course it would be very hard to write down a number on the small signal transistors...
I have used this little boxes to sort them by number.
You simply "scan" your sorted excel sheet for pairs and select them by number from the box.
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Old 9th February 2018, 08:20 AM   #13
astx is offline astx  Austria
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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
Dear Mark,

any update? Any help needed?

BR, Toni
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Old 26th August 2018, 03:58 AM   #14
HYPERTUNE is online now HYPERTUNE  Australia
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Been very busy lately but finally got a chance to spend some time on the SA2014 project.


If anyone notices a mistake, feel free to speak up
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File Type: jpg SA2014 HC TOP.jpg (556.8 KB, 74 views)
File Type: jpg SA2014 HC BACK.jpg (585.8 KB, 67 views)
File Type: jpg SA2014 OPS.jpg (601.4 KB, 72 views)
File Type: jpg SA2014 OPS2.jpg (781.1 KB, 51 views)
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Old 26th August 2018, 04:08 AM   #15
HYPERTUNE is online now HYPERTUNE  Australia
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Great amps deserve great drivers. Got a pair of BlieSMa T34A to go with the AT 15H mids. Should make a nice combination. Just have to decide on woofers now...
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Old 26th August 2018, 04:31 AM   #16
HYPERTUNE is online now HYPERTUNE  Australia
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I got plenty of the smaller transistors and was able to get perfect matches where required.

For the output devices, I only got 20 of each and eliminating the worst 4 gave me hFe spread within 5-10%. Good enough?
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Old 26th August 2018, 01:16 PM   #17
astx is offline astx  Austria
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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
very nice! well done!



5-10% deviation total is fine.


BR, Toni
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