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Old 7th September 2013, 03:21 AM   #2261
6L6 is online now 6L6  United States
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Wonderful build! Looks great!

Are you going to try swapping out a different amp PCB, like the F4 or Aleph J?
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Old 7th September 2013, 03:35 AM   #2262
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Indeed beautiful....

Congrats JDKJAKE
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Old 7th September 2013, 12:12 PM   #2263
bcmbob is offline bcmbob  United States
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Thanks guys - always something new to learn and apply in future builds.
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Old 7th September 2013, 12:38 PM   #2264
WalterW is offline WalterW  Netherlands
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Very nice jdkJake!

What resistor value did you use for degeneration of the J74?
Are you using the 100 Ohm feedback resistors or the 220 Ohm? More or less gain?

Walter
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Old 7th September 2013, 02:06 PM   #2265
jdkJake is offline jdkJake  United States
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Thanks for the kind words.

Quote:
Originally Posted by 6L6 View Post
Are you going to try swapping out a different amp PCB, like the F4 or Aleph J?
No plans as of yet, although the Aleph J is mighty tempting. The nice thing with the universal chassis with all the DIY-friendly features is that the options for the future are wide open. For now, I am very, very happy with the F5-based design.

Quote:
Originally Posted by bcmbob View Post
Thanks guys - always something new to learn and apply in future builds.
That's the best part of this hobby; always something new to learn and apply.

Quote:
Originally Posted by WalterW View Post
What resistor value did you use for degeneration of the J74?
Are you using the 100 Ohm feedback resistors or the 220 Ohm? More or less gain?
I added 5R to the source of the J74. So, a total of 15R on the J74 source and 10R on the K170. The K170 set is matched to 6.5mA and the J74 set matched at 7.3mA

I am using 100R feedback resistors. I did not bump the gain.
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Old 7th September 2013, 03:19 PM   #2266
bcmbob is offline bcmbob  United States
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Since the liquid cooled build is disassembled for chassis work, I thought I would share some pics that show the modular nature of the design. Remaining project elements are reservoir/pump rework, relief plug at top of water block, bottom drain, internal fan/motor speed controls and a high temp AC shutoff safety switch. Hopefully that will "Get er Done"
Attached Images
File Type: jpg BO1.jpg (717.1 KB, 1396 views)
File Type: jpg BO2.JPG (130.6 KB, 1308 views)
File Type: jpg BO3.jpg (558.6 KB, 1264 views)
File Type: jpg BO4.jpg (761.7 KB, 1188 views)
File Type: jpg BO5.JPG (177.8 KB, 1193 views)
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Old 7th September 2013, 05:31 PM   #2267
Blues is offline Blues  United States
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Quote:
Originally Posted by jdkJake View Post
So, this is my take on the F5 design. I like to call this one my "DIYAudio Special"...
You're welcome JK...beautiful build and a good home for the mosfets. Our last email exchange was just over a year ago so really a nice, well-planned one. Enjoy!

With your heatsinks you can fire up your F5s even on a hot FL day.
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Old 10th September 2013, 02:48 AM   #2268
jdkJake is offline jdkJake  United States
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Quote:
Originally Posted by Blues View Post
Our last email exchange was just over a year ago so really a nice, well-planned one.
That and a whole lot of UN-planned life events...

Gotta say, it is quite the little space heater at the bias levels I am using. Gonna be great for a typical mild Florida winter. I might never have to use my heat pump again! Hard to believe it might actually be considered somewhat "green" in the proper context.

Thanks again Blues.
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Old 10th September 2013, 03:25 PM   #2269
WalterW is offline WalterW  Netherlands
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Finished my ACA.
They sound very nice for such small 5 Watt amplifiers. I use them at night when the kids are sleeping, to listen at low volumes.
At daytime the F5Tv3 is the one I listen to...

ACA has some difficulties controlling the big 4 ohm 10" woofers of my three-way speakers

Walter
Attached Images
File Type: jpg backACA.jpg (384.8 KB, 593 views)
File Type: jpg frontACA.jpg (255.1 KB, 512 views)
File Type: jpg bigbrother.jpg (251.8 KB, 543 views)
File Type: jpg Vivace2012.jpg (322.2 KB, 543 views)
File Type: jpg star.jpg (254.8 KB, 519 views)
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Last edited by WalterW; 10th September 2013 at 03:28 PM.
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Old 10th September 2013, 03:29 PM   #2270
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Walter, Those are cool, way cool!
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Last edited by sakellogg; 10th September 2013 at 03:32 PM. Reason: forgot a word
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