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Old 6th July 2013, 09:28 PM   #2081
WalterW is offline WalterW  Netherlands
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Location: Utrecht
Default Finished F5T v3

Finally finished the v3.
It's exactly build according the Nelson Pass circuit except for the (better?) Toshiba MOSFETs in the output stage.
In the version 2, I biased the MOSFETs at 1,25 A @ 32V, which resulted in very hot MOSFETs. Around 70 degrees Celsius.
Now I've doubled the output devices, so half the current for each device, and used Kerafol instead of mica and goop. Also clamped the output MOSFET's and yes, now I have only 5 a 6 Celsius difference between the heatsinks and the output devices.
Kerafol 86/82 under big pressure rocks !
Heatsinks max out around 58 C with 0,225A per rail bias and the MOSFETs are around 62 C.
Can't use 2.5 A bias per rail since my T ambient is around 25C this time of year

I also implemented a thermal protection by glueing 75C switches on the Toshibas.
Didn't need too implement C3 and C4 for stability.

The amp is dead silent, and it sounds so great !
During the rebuild to a version 3, I constantly listened to my standard F5 ( which isn't bad!) but this v3 has definitely more body, bigger soundstage, more bass and sounds a bit more detailed and relaxed, yes.

Attached are my last pictures for this project.

Now it's time to build a set of high end speakers... suggestions are welcome...

Although I already ordered the ACA PCB's and the beautiful red chassis for a little desktop computer class A Amp ( or maybe for my son) , I must say the Aleph J pre-order PCB's in the store are tempting
Would like to hear how a single ended class A will sound

Walter
Attached Images
File Type: jpg Thermally coupled JFETs.jpg (412.7 KB, 1096 views)
File Type: jpg Clamping bars for the MOSFETs.jpg (171.8 KB, 1032 views)
File Type: jpg Turbo-engine V3.jpg (295.7 KB, 1016 views)
File Type: jpg Thermal protection.jpg (394.2 KB, 987 views)
File Type: jpg Open chassis.jpg (374.9 KB, 972 views)
File Type: jpg Very nice inside view.jpg (348.2 KB, 726 views)
File Type: jpg 4 output on Kerafol.jpg (415.1 KB, 636 views)
File Type: jpg Inside with frontpanel.jpg (316.7 KB, 658 views)
File Type: jpg Ooh, my God....jpg (262.9 KB, 584 views)
File Type: jpg finally ready.jpg (251.8 KB, 634 views)
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Pass F5, F5Tv3, ACA, Aleph J, DDDAC1794, DCB1, BA3-preamp, VFET CSX1.
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Old 6th July 2013, 09:43 PM   #2082
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Quote:
Originally Posted by WalterW View Post
Now it's time to build a set of high end speakers... suggestions are welcome...
One of the Jenzens from Troels Gravesen. I heard the Jenzen ER: it's magnificent. I am currently building the Jenzen NEXT and if you wish there are even Higher End Jenzens :-)
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Old 6th July 2013, 10:12 PM   #2083
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Walter...your amp looks very nice! Hats off to you
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Old 6th July 2013, 10:14 PM   #2084
WalterW is offline WalterW  Netherlands
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Thanks ijscoman

Will have a look at it, on his website. Been there before and was very pleased with his designs...

Walter
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Old 6th July 2013, 10:49 PM   #2085
PKI is offline PKI  United States
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http://www.troelsgravesen.dk/cyclop.htm
http://www.troelsgravesen.dk/JA8008_DTQWT.htm
:-)
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Old 6th July 2013, 11:10 PM   #2086
WalterW is offline WalterW  Netherlands
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Quote:
Originally Posted by PKI View Post
Thanks! Those cabinets are difficult to build...for me, a starter...only built a quite big subwoofer so far...
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Old 6th July 2013, 11:22 PM   #2087
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Great looking build! Nice work
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Old 6th July 2013, 11:38 PM   #2088
labjr is offline labjr  United States
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That is nice. I noticed you have an ebay soft start module. Does that one work well?
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Old 6th July 2013, 11:49 PM   #2089
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Very nice where the chassis come from ?
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Old 7th July 2013, 12:10 AM   #2090
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Quote:
Originally Posted by WalterW View Post
Finally finished the v3.
It's exactly build according the Nelson Pass circuit except for the (better?)
Walter
very good, nice to see a completed unit. Especially using teabags boards. Hopefully your build along with others, will help people like me along their path of building something similar.
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