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EL34 Baby Huey Amplifier
EL34 Baby Huey Amplifier
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Old 5th October 2019, 03:05 PM   #611
bandol83 is offline bandol83  France
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Join Date: Nov 2004
Location: near Bandol, French Riviera
Hello Prasi,

Thanks for the PCB, they are just arrived and are very nice as usual

I am not in favor of a new thread, it will only make things more confusing. I have already started this thread because of the change from EL84 in the original Ian thread to the EL34 version... There is also someone who started a Wiki thread and there is the GB thread ! Too much thread make the information difficult to find and some time errors between different posts

Therefor I will stay on this thread only, but I have no problem to publish information again about schematic and BOM for the EL34 Baby Huey MK2

There is no stuffing guide yet since I have not yet build the MK2 version but the principe is very close to the first version with the advantage to have the serigraph on both sides of the PCB

You can also read the comments from Ian for KT88 version with voltage options up to 50V for the driver stage but with -100V for bias be careful with 2N5551 which are specified at 150V voltage !

Personally I am not a big fan of KT88, the ones I have tested on my Jolida amplifier sounded too hard, I prefer the 6550 that I am using now, I may try them on the MK2 ?

Cheers,
Marc
Attached Files
File Type: pdf SchemaBaby Huey MK2 Rev 1.5.pdf (149.8 KB, 260 views)
File Type: pdf Baby Huey MK2 BOM.pdf (829.5 KB, 137 views)
File Type: pdf Schema Baby Huey MK2 power supply 1.5.pdf (148.9 KB, 224 views)
File Type: pdf Baby Huey MK2 Power Supply BOM.pdf (970.6 KB, 158 views)
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Old 6th October 2019, 09:09 AM   #612
lordoff is online now lordoff  Bulgaria
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Join Date: Oct 2006
Location: Sofia
Thank you Marc and Prasi,

for collecting all info in one place/post!
Very, very helpful, no doubt, for all of us.
Also, you comments and recommendation about possible variants are precious!
Glad to be owner of such Excellent PCB's, btw! :-)



Kiril
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Old 8th October 2019, 02:40 PM   #613
gbowling is offline gbowling  United States
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Join Date: Jun 2008
Location: Michigan
My boards also just arrived and as previously stated, in perfect order!

Thank you very much for the great work Prasi, Marc and everyone else who has contributed.

I'm now getting close to starting my build, should be fun.

gabo
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Old 14th October 2019, 06:26 PM   #614
tomtest is offline tomtest  Germany
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Join Date: Mar 2018
Location: Duesseldorf, Germany
EL34 Baby Huey Amplifier
Default Mouser BOM Baby Huey MkII

Hi Marc and all other Guys,

today I have ordered the first parts for the Baby Huey MkII and stumbled over one problem.
In the original BOM from Marc (Revised September 2019) there is CX1 with a value of 10nF and 1000V but the order Number RDER72J104K4M1H03A belongs to a capacitor with 0,1uF (100nF) 630V.
I think the Voltage is not a problem, but which value is the right one?

Not so an important information, the resistors R33 and R38 seems to be not available at Mouser, they have an alternativ one from Yageo.

The link to the BOM (with all parts you can order for this project at Mouser) is at the end.

Attention: The BOM is for one PCB, for a normal stereo set you must order it twice!
It includes both Versions of CX1, the original order number in the original sequence, the original value at the end named as: CX1 alternativ; R33, R38 is replaced with the Yageo parts!

Have lot of fun during the build and listening!

Kind regards
André

Link: https://www.mouser.com/ProjectManage...sID=d65300aacc
Please copy it before editing or changing.
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Old 15th October 2019, 09:24 AM   #615
bandol83 is offline bandol83  France
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Join Date: Nov 2004
Location: near Bandol, French Riviera
Hello André,

Thank you for your feedback

All your remarks are very exacts and useful. For CX1 the value is not critical, it is just a HF decoupling and since I had plenty of 10 nF 1000 V in stock I use them, but a 100 nF 630 V can be used too, be careful with the size however !

Best regards,
Marc
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Old 1st November 2019, 08:10 AM   #616
lens42 is offline lens42  United States
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Join Date: Mar 2008
Are Gerber files (or maybe even Eagle files, so one can customize) available for the EL34 Baby Huey? I see people mention getting boards, but don't see how they were obtained. Group buys, and their restricted timing, don't seem to make sense any more when one can get PCBs cheaply from sources like JLCPCB. For example, I got five 6"x6" boards for $35 (including shipping) for my turntable project:
Philips 212 (GA212) Turntable Upgrade | lensprojects
I understand if files are not freely available because someone wants to make a bit of cash for their efforts, but if that is not the limitation, maybe they can be posted somewhere?
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Old 1st November 2019, 02:45 PM   #617
Francois G is offline Francois G  United States
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Location: Illinois
Quote:
Originally Posted by lens42 View Post
Are Gerber files (or maybe even Eagle files, so one can customize) available for the EL34 Baby Huey?

......for my turntable project:
Philips 212 (GA212) Turntable Upgrade | lensprojects
Welcome Mr. Lens! Your points about inexpensive custom PCBs are well taken; applicable to skilled folks. The Group buys that Prasi ran for the Baby Huey builders were really well done and inexpensive, delivering superbly made boards to some of us who lack the requisite skills. Unfortunately I think all the boards are spoken for at this point.

I looked at your web wordpress site and thoroughly enjoyed your turntable project and meticulous documentation of it, as well as your other impressive efforts. Thanks for sharing your experience. If you choose to build one you will be an asset and resource to the other Baby Huey builders.

If you are willing to document your EL34 Baby Huey project I have an extra pair of Mk 1 boards I will mail to you for free. Just PM me.
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Old 15th November 2019, 10:41 AM   #618
Heretik HiFi is offline Heretik HiFi  United Kingdom
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Is there an excel version of the BOM having some issues with the .PDF

Thanks.
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Old 26th November 2019, 06:12 PM   #619
gbowling is offline gbowling  United States
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Location: Michigan
Quick question, is there a mouser project for the power supply BOM?

I used the one from André (thanks!) for the MK II boards, but I haven't seen a link to one for the power supply.

If nobody has one I'll try to figure out how to do that when I order the parts and build one.

Thanks, gabo


Quote:
Originally Posted by Heretik HiFi View Post
Is there an excel version of the BOM having some issues with the .PDF

Thanks.
FYI, Heretik HiFi - you can go to Mouser and export the BOM to an excel sheet.

Last edited by gbowling; 26th November 2019 at 06:14 PM.
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Old 26th November 2019, 07:19 PM   #620
gbowling is offline gbowling  United States
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Join Date: Jun 2008
Location: Michigan
Also there are some discrepancies between the power supply BOM and the printed information on the board.

Component................BOM PDF............................Printed on board
C7.............................220uf, 25v.........................2200uf, 25v
C4.............................0.15uf, 160v.......................2uf, 160v
C5.............................0.15uf, 160v......................1uf, 160v
C6.............................0.15uf, 160v......................100nf, 160v
C9.............................10uf, 25v...........................33uf



I haven't checked the circuit, but I suspect these make little to no difference. Just makes it easier to populate the board if the values of what you're putting in match what's printed on the board.

thanks, gabo

Last edited by gbowling; 26th November 2019 at 07:22 PM.
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