Kofi Annan in: "Kofi's Baby Huey"

Kofi Annan · 30th April 2010, 12:18 AM

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

Kofi Annan · 30th April 2010, 12:23 AM

Pictchurzeses...

Kofi Annan · 30th April 2010, 12:30 AM

And the latest schematics...

nic6paul · 30th April 2010, 01:43 AM

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.

Kofi Annan · 30th April 2010, 01:49 AM

Quote:

Originally Posted by nic6paul

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

Kofi Annan · 30th April 2010, 01:59 AM

Here is what appears to be an exhaustive review of film caps from Humble Homemade HiFi:

Humble Homemade Hifi

Enjoy.

Kofi

Ian444 · 30th April 2010, 03:11 AM

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.

dupyv · 30th April 2010, 08:39 AM

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

adamus · 02:53 PM

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.

adamus · 30th April 2010, 02:54 PM

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).

30th April 2010, 01:43 AM	#4
nic6paul diyAudio Member Join Date: Jan 2007 Location: Minnesota	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. __________________ - Nic

30th April 2010, 02:51 PM	#9
adamus diyAudio Member Join Date: Apr 2008	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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30th April 2010, 01:59 AM	#6
Kofi Annan diyAudio Member Join Date: Jan 2004 Location: US	Here is what appears to be an exhaustive review of film caps from Humble Homemade HiFi: Humble Homemade Hifi Enjoy. Kofi

30th April 2010, 03:11 AM	#7
Ian444 diyAudio Member Join Date: Nov 2008 Location: Brisbane QLD	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.

30th April 2010, 08:39 AM	#8
dupyv diyAudio Member Join Date: Jan 2007	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

30th April 2010, 02:54 PM	#10
adamus diyAudio Member Join Date: Apr 2008	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).