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Old 30th April 2010, 12:18 AM   #1
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Default Kofi Annan in: "Kofi's Baby Huey"

Hey!

So, after much deliberation and dumbassedry here (Kofi Annan in: "Pushed and Pulled Back!"), Kofi has decided on the Baby Huey design for a friend's amp.

Attached is my current BOM. I know I've included some parts that many would consider "boutique" or perhaps "audiophool", but I'm still pretty stupid these days and since I've used these parts before with success, I'm reluctant to change.

So... more posts to come, but any feedback on the current BOM would be helpful.

Google Sketchup-designed top plate and layout to follow.

Yeah.

Kofi
Attached Files
File Type: zip Baby Huey BOM (Excel).zip (6.7 KB, 182 views)
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Old 30th April 2010, 12:23 AM   #2
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Pictchurzeses...
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File Type: png Baby Huey (Close Up).png (155.7 KB, 1091 views)
File Type: png Baby Huey (Front).png (85.1 KB, 1039 views)
File Type: png Baby Huey (Top Down).png (55.6 KB, 1023 views)
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Old 30th April 2010, 12:30 AM   #3
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And the latest schematics...
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File Type: gif ppel84_baby_huey.gif (67.7 KB, 1076 views)
File Type: gif ppel84_baby_huey_psu.gif (90.0 KB, 1046 views)
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Old 30th April 2010, 01:43 AM   #4
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Have you used those mundorf capactiros before? I was thinking of using them in my Engineers amplifier for the coupling caps. They are reasonably affordable.
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Old 30th April 2010, 01:49 AM   #5
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Quote:
Originally Posted by nic6paul View Post
Have you used those mundorf capactiros before? I was thinking of using them in my Engineers amplifier for the coupling caps. They are reasonably affordable.
Yes. I've used them in some voltage amps (read: phono and MC preamps) and I have had good results. Nothing measured, mind you, but I bet some other DIYAudio folks have measured and can respond from an engineering perspective...

Kofi
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Old 30th April 2010, 01:59 AM   #6
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Here is what appears to be an exhaustive review of film caps from Humble Homemade HiFi:

Humble Homemade Hifi

Enjoy.

Kofi
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Old 30th April 2010, 03:11 AM   #7
Ian444 is offline Ian444  Australia
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I'm not sure if you are aware that there was a later schematic with mosfet source followers to drive the output tubes, and fixed bias on the output tubes. The Baby Huey (and it's predecessor by Yves) has intrigued me ever since I first read about it, I am so curious I really must do myself a favour and build one at some time.

Ian.
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Old 30th April 2010, 08:39 AM   #8
dupyv is offline dupyv  Luxembourg
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Kofi,

I second Ian444's advice to check out the later BabyHuey variant with fixed
bias and mosfet followers. I checked this version out in a test-bed and found it
to be more effortless & dynamic in the bass. Hence i'm building my 2nd BabyHuey according to the fixed bias version.

The original BabyHuey is my "daily-driver", it's an excellent choice too, it's
a bit simpler to build.
You won't be disappointed with any of the BabyHuey variants, as Gingertube said: It's simple to build but hard to match.

Kind regards,

Yves
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Old 30th April 2010, 02:51 PM   #9
adamus is offline adamus  United Kingdom
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another huey, marvellous.

My huey constantly impresses those who get a listen.

when picking parts, i found that the sound is senstive to the bypass caps in the el84 cathodes. do spend here.

I would also say, the 6p14p-ev (ev is important) are the best output tubes you can buy under 20. Bloody marvellous.

Last edited by adamus; 30th April 2010 at 02:53 PM.
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Old 30th April 2010, 02:54 PM   #10
adamus is offline adamus  United Kingdom
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Also, any reason (other than cost) not to go for choke in the PS. IT makes it so much easier to tweak the B+ and leads to a lovely silent supply (with fostex 95db/w i have zero hum with a choke input).
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