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EL34 Baby Huey Amplifier
EL34 Baby Huey Amplifier
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Old 27th August 2019, 01:35 PM   #571
gbowling is offline gbowling  United States
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Quote:
Originally Posted by Bfpca View Post
I should get a good idea of the BH sound versus the F5s and I’ll try to report what I find.
I look forward to your comparison of these two. I plan on building my EL34 this winter, starting maybe in Jan after the holidays.

Next on my list after that build is an F5T build.

Thanks, gabo
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Old 27th August 2019, 03:29 PM   #572
feralmeida is offline feralmeida  Spain
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EL34 Baby Huey Amplifier Send a message via Yahoo to feralmeida
I decided to finish the 2010 project (audiodesing.com), 50W is a lot of power for me, and I was going to leave it for BH, in the absence of 2 resistance values ​​it is absurd
I have contacted A. Ciuffoli (for a value of 1 that I was missing , it is easy to guess, the use of some component of my stock, does not need to be 100% copied, therefore, less expenses)
have updated on another modification, and confirmed my stock components, they fit very well!

BH, 1 it's a gift, to a dear relative whom I have a lot to thank (I'm excited because I know he will like it, there are help that cannot be measured in money, expect a small NAD to replace your broken amplifier)

I already have a couple of sets Toroidy, and I just received the DC / DC converters, meanwhile, I will prepare the chassis (I am retired, without holidays and all my time is free, which my health allows me).

Then, much more calmly, I will test my modifications with other tubes
(for example, PE06 40E and 40N, one channel needs 6.3V and another 12.6V for heaters... and more fun). :RE

I will appreciate your impressions of F5T

All the best
Fernan

P.S.
I don't know if you can understand my google translate english well : o

Last edited by feralmeida; 27th August 2019 at 03:36 PM. Reason: grammatical disaster
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Old 31st August 2019, 04:40 PM   #573
feralmeida is offline feralmeida  Spain
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EL34 Baby Huey Amplifier Send a message via Yahoo to feralmeida
I found this!

Baby Huey PP EL84 amplifier

For those of us who have less technical knowledge, it is good material to study,
learn and understand well "BH"
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Old 5th September 2019, 11:43 AM   #574
DATIR is offline DATIR  Romania
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hello guys,
I am noob with tubes so i don't have too much knowledge about this but somehow i designed my own PCB for baby huey amplifier :-) the winter is coming :-))
Still remains to design a pcb for power supply and some delay for HV and after that i will send the gerbers to factory.
And i need to continue to do more research about tubes amplifiers :-)
This is first revision, still i need to do some optimization.
Attached Images
File Type: png PCB trace.png (211.4 KB, 274 views)
File Type: png top 3D.png (366.3 KB, 250 views)
File Type: png bot 3D.png (82.8 KB, 274 views)
File Type: png top pcb.png (484.9 KB, 248 views)
File Type: png bot pcb.png (348.4 KB, 250 views)
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Old 11th September 2019, 09:49 AM   #575
cgraf is offline cgraf  Switzerland
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Hi

While waiting for the MKII Boards of the Baby Huey, I looked a bit around concerning output transformers and wanted to share my findings by supplying a list of manufacturers (rather Europe based) for torodial and classical output transformers.

I will build the amp as two mono blocks. The idea for the moment is to use a toroidal transformer as power tranny, and a EI one as output transformer. But not sure yet.

Here is my list:

German manufacturer, they look nice and are massive:
Ausgangsübertrager, Gegentakt AÜ260, M102a, 6kOhm

German reseller, no idea about the quality but they sell the transformer covers separately:
Frag Jan zuerst- Ask Jan first: Roehren und mehr

German manufacturer. Looks nice but they don't have covers:
Gegentakt-Ausgangsubertrager ATR 55 6.600 Ohm Raa-UL | TBT Trafobau

Italian Manufacturer:
TRASFORMATORE DI USCITA per EL34 PUSH PULL 3400 + Prese / 4 - 8 ohm 50W. Laboratorio Musicale

German Manufacturer:
Welter Audio Electronic Seit 1975

Polish manufacturer:
http://ogonowski.eu/transformers/push-pull/lo-pp40-1/

Edcor USA: good prices, shipping to Europe very expensive:
https://www.edcorusa.com/cxpp25-66k

Hammond, available all over Europe
https://eu.mouser.com/ProductDetail/...%2F29BJF54UQ==

Polish Manufacturer. Very nice chrome covers
https://sklep.toroidy.pl/en_US/p/TTG...or-similar/562

French Reseller/manufacturer (not sure)
http://www.look-audio.com/contents/fr/d8.html

Italian manufacturer: I know that one of the best sounding amps I listened to is using these:
http://www.teca.net/it/prodotti/valvolare.php

Italian manufacturer with online calculation of the power transformer:
https://autocostruire.com/trasformatori/menubar-en.php


Last but not least an idea for transformer covers, covering the WHOLE transformer
https://it.aliexpress.com/item/32904...6c364c4dSVmdIh


Best regards
Christoph
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In theory, practice and theory are the same, but in practice they are different (Larry McVoy)
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Old 11th September 2019, 11:56 AM   #576
bandol83 is offline bandol83  France
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Hi,

This is a new updated and corrected B.O.M. There was an error with R16, the value was changed to 47k based on Ian (gingertube) recommendation but the manufacturer code was wrong

Please check the list when ordering and let me know if you find other error ?

Au revoir,
Marc
Attached Files
File Type: pdf Baby Huey MK2 BOM.pdf (829.5 KB, 44 views)
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Old 11th September 2019, 12:41 PM   #577
feralmeida is offline feralmeida  Spain
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Thanks

CX1 10nF in BOM, code go to 100nf ( RDER72J104K4M1H03A )
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Old 11th September 2019, 02:14 PM   #578
bandol83 is offline bandol83  France
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Thanks for your nice observation Fernan (you already found the 47k error)

CX1 is not critical 10 or 100 nF is OK but a minimum of 630 VDC is required ! While checking this point, I have seen that the distance between lead is 10 mm, therefor the following capacitor from EPCOS / TDK will fit the board nicely : B32671P6104K000 ( https://www.mouser.fr/ProductDetail/...%2FW1fn8GEs%3D ) but the RDER72J104K4M1H03 will be OK too with a 5 mm between leads

I used a 10 nF 1000 V because I had it in stock...

It is important to check all component size to be sure that they can fit the PCB holes without problem

Cheers,
Marc
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Old 11th September 2019, 04:11 PM   #579
feralmeida is offline feralmeida  Spain
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Quote:
Originally Posted by bandol83 View Post
Thanks for your nice observation Fernan (you already found the 47k error)

CX1 is not critical 10 or 100 nF is OK but a minimum of 630 VDC is required !
It is true.
in the BOM I only thought of grouping R6 with R16 :RE
Then it's done!

V Thanks
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Old 11th September 2019, 10:08 PM   #580
stonehome is offline stonehome  United States
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Well, I am going to add to the available transformers list. Even though I am in the U.S. I have ordered from Menno VanderVeen twice, shipping isn't bad and I usually have the transformers in a couple weeks. Power transformers aren't listed but just list the secondaries required and you will get a quote. All test specifications available also. Very happy with the ones I have.
Push-Pull

Ev

Last edited by stonehome; 11th September 2019 at 10:10 PM. Reason: spelling
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