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My Babelfish J Monoblock Project
My Babelfish J Monoblock Project
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Old 20th December 2018, 04:53 AM   #21
Coasttocoast is offline Coasttocoast  United States
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My Babelfish J Monoblock Project
Quote:
Originally Posted by Zen Mod View Post
Wakoo CtC

piano finish .......

Thanks!

Do you think red is too much?

B737ECEB-300A-421C-A912-002ADF7A1FF1.jpeg

Power supply finished

F19C9CB0-583A-4D51-AB14-0E489021E4DA.jpeg

Rear panel finished

7C2E3C15-99B6-446D-9C12-3C07D1A8D9E3.jpeg

No one asked about the 8 hole in the side of the case, I guess everyone guessed it was for the transformer? Ever since I bought these beautiful Toroidy transformers I hated they would be hidden in the case and never seen again. This build I figuout a way. The transformer is completely supported by the aluminum brace, there is a 1/4 gap beween the perimeter of transformer and the case to allow air into the case for cooling. The aluminum brace also serves as a heatsink for the rectifiers. Am I crazy?

6578307B-7607-417B-9421-F732B13CFD26.jpeg

Was hoping to have one amp done before we flew out for the holidays, but need some more parts. Going to have to wait till next year now.
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Ekta Grande speakers, DIY 13" ScanSpeak sub's w/Hypex Fusion 501s, Transparent Ultra cables.
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Old 20th December 2018, 09:18 AM   #22
Zen Mod is online now Zen Mod  Serbia
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now you have a place even for motor-run bypass caps
50uF is good value
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Old 22nd December 2018, 01:44 AM   #23
Coasttocoast is offline Coasttocoast  United States
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Join Date: Jul 2012
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Quote:
Originally Posted by Zen Mod View Post
now you have a place even for motor-run bypass caps
50uF is good value
You referring to something like a pair of these?

DFC0B5C4-5F9C-4DC3-A432-81B414D3C700.jpeg

Would they just bypass the large caps? Or bypass the whole power supply?

Thanks ZM
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Ekta Grande speakers, DIY 13" ScanSpeak sub's w/Hypex Fusion 501s, Transparent Ultra cables.
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Old 22nd December 2018, 01:53 AM   #24
Coasttocoast is offline Coasttocoast  United States
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Need to start packing for the holiday trip to the mainland. But thought I would show where I ended up today.

The power supply along with the power on relay is tested and operational. The case is now pretty much together. Changing the 12v system that operated the fan and the relays on the slow charge circuit. Need about a day to finish up boards and wiring.

FYI, the heatsinks and 3/8 aluminum panel they are bolted too weigh in at 43.2 lbs.

But here are some pics to give final look and scale of size.

FA9FD60D-FCA9-428C-8ECF-B6C0C72F81F3.jpeg

65313E51-B37E-4D5A-84BE-98BB55F4DE41.jpeg

F30B8920-52F7-4CEE-91F7-EEC3197C360E.jpeg

B51666DC-B8FB-4412-BD49-2BA8498F90D3.jpeg

6E5A913A-4434-4FB6-9D45-8758B3B095B8.jpeg
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Ekta Grande speakers, DIY 13" ScanSpeak sub's w/Hypex Fusion 501s, Transparent Ultra cables.
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Old 22nd December 2018, 03:45 AM   #25
Soundhappy is offline Soundhappy  France
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@ Coasttocoast
Yeah MAN it's looks fantastic, beautiful work!
Congratulations
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Old 22nd December 2018, 04:32 AM   #26
dBel84 is offline dBel84  United States
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Incredible craftsmanship, very nicely done..dB
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Old 22nd December 2018, 08:23 AM   #27
Zen Mod is online now Zen Mod  Serbia
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Quote:
Originally Posted by Coasttocoast View Post
You referring to something like a pair of these?

Attachment 723699

Would they just bypass the large caps? Or bypass the whole power supply?

Thanks ZM
yup , motor-run caps

bypass "just" each final cap in supply , so one per rail

on this side of Big Splash , I'm using either Icar or Ducati caps , in plastic case, they're of awesome quality
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Old 22nd December 2018, 05:34 PM   #28
Juntuin is offline Juntuin  Finland
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Really nice work!
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Old 5th January 2019, 10:27 PM   #29
Coasttocoast is offline Coasttocoast  United States
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Join Date: Jul 2012
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My Babelfish J Monoblock Project
Been on the mainland for the holidays. 3 cities visited, over 10k miles flown, trip was fun, but glad to be back home!

Soundhappy, dBel84, Juntuin thanks much for the compliments! Sorry for delay in response.

Zen Mod, ordered the caps. Should be in this week, thanks.

Spent yesterday and today so far on the amp. In the attached pic you can see how I matched up the Mosfets. The two numbers by each chip are the readings from testing at 13v (2 decimal points) and 30v (3 decimal points). I gave more weight to the 30v testing since Im running higher voltages

I bought matched resistors also, uppers are all 1.003 Ohm, lowers all 1.004 Ohm.

I should have just bought new daughterboards, took a lot of time removing all the resistors, wires and Mosfets.

In the last build I ran separate wires from the FE board to each daughterboard, this time Im running a jumper between daughterboards. Seems like this way would be better?

Thats a lot of heatsink for 12 Mosfets! I placed the Mosfets 1/3 of the height of the heatsink up from the bottom. The upper and lower heatsinks do not touch, except for the mounting angle on each end. There is a separation of 3/16 between the 3/8 aluminum plates and 1 1/4 between the actual heatsinks. The 3/16 gap goes to the interior of the chassis to allow air in and out through the fan.

B075A78A-E5F4-4206-8E42-B44D20B5F308.jpg
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Babelfish J as Aleph 2, McIntosh C2300, RAKK DAC Mark IV Extreme, Oppo UDP-203 DVD/CD, Custom SP10 MKII/SME 312s/Koetsu Urushi Black, Magna Mano streamer, Ekta Grande speakers, DIY 13" ScanSpeak sub's w/Hypex Fusion 501s, Transparent Ultra cables.
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Old 5th January 2019, 10:29 PM   #30
Zen Mod is online now Zen Mod  Serbia
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I see nothing to complain about , so I'm silent

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