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EL34 Baby Huey Amplifier
EL34 Baby Huey Amplifier
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Old 6th October 2018, 11:13 AM   #101
ckwong99 is offline ckwong99  Hong Kong
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Join Date: May 2005
Location: HK
Hi BandoI83, do u think where the BH EL34 parts need to be changed ? When my UL output transformer is 5K impedence and all DC supply voltage will follow the original design requirement.
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Old 7th October 2018, 10:19 AM   #102
bandol83 is offline bandol83  France
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Join Date: Nov 2004
Location: near Bandol, French Riviera
Hi ckwong99,

I don't think you need to change part value with your 5k TANGO output transformer, I have build my EL34 Baby Huey with a 4.3k Hammond 1650N output transformer and a TOROIDY TSTA 250/001 power transformer (using the 275 VAC output) with the recommended values without any problem

I know also that some builders have used the TOROIDY EL34PP (6.6k) and the KT88PP (4k) output transformers and the actual BOM with good results too...

Marc
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Old 7th October 2018, 11:53 AM   #103
ckwong99 is offline ckwong99  Hong Kong
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Good news for me Thx Sir
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Old 14th October 2018, 06:36 PM   #104
calipilot227 is offline calipilot227  United States
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Hey guys,


Apologies if this has been asked before, but I would like to build the Baby Huey to accept the KT88 tubes. If I use the Hammond 1650N, will I need to change anything else in the circuit, or will it work with both the EL34 and KT88?
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Old 15th October 2018, 08:18 AM   #105
bandol83 is offline bandol83  France
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It work with both when using Hammond 1650N, see pictures

Marc
Attached Images
File Type: jpg Ampli KT88.JPG (363.9 KB, 635 views)
File Type: jpg Comparaison 6CA7 et KT88.JPG (492.0 KB, 646 views)
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Old 17th October 2018, 09:09 AM   #106
jcastellano is offline jcastellano  Spain
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Join Date: Mar 2011
Location: Tenerife, Canary Islands
Default Some photos

Hi,

Here are some photos from the "old" pcb and the new one. The old is installed and working wonderfully.

I will follow-up with some more info when I install the new boards.

Regards,

Jorge
Attached Images
File Type: jpg IMG_0019.jpg (76.0 KB, 587 views)
File Type: jpg IMG_0020.jpg (75.2 KB, 591 views)
File Type: jpg IMG_0021.jpg (83.0 KB, 581 views)
File Type: jpg IMG_0022.jpg (89.1 KB, 198 views)
File Type: jpg IMG_0023.jpg (75.4 KB, 183 views)
File Type: jpg IMG_1192.jpg (74.1 KB, 234 views)
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Old 17th October 2018, 10:04 AM   #107
Vunce is offline Vunce  United States
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EL34 Baby Huey Amplifier
Hi Jorge,

What’s the model number of Hammond chokes your using? You have a real nice premium build right there
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Old 17th October 2018, 10:29 AM   #108
jcastellano is offline jcastellano  Spain
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Default Hammond Chokes

Quote:
Originally Posted by Vunce View Post
Hi Jorge,

What’s the model number of Hammond chokes your using? You have a real nice premium build right there
Hi...

The Hammond Chokes are model 159V. I installed them because in my experience, the resistor in the PSU is noisier than a choke. I did have some humming noise and after changing the resistors and also installing bigger caps in the PSU, the noise went away. I feel that (IMHO) the 400v caps are not suitable for a 275v AC secondary. Until the amp stabilizes, the PSU voltage goes higher than the rated 400v so, for a minute more or less, the caps are pushed real hard....

https://www.mouser.es/ProductDetail/...kgBu8ERAfhg%3d

Thanks for your kind words....

Regards,

Jorge
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Old 17th October 2018, 10:36 AM   #109
Vunce is offline Vunce  United States
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EL34 Baby Huey Amplifier
Thanks for the recommendation Jorge.
I will also utilize a choke in the psu.
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Old 17th October 2018, 01:18 PM   #110
ckwong99 is offline ckwong99  Hong Kong
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Hi Bondo. Do u think i can use AC 315V then the CRC ,the R replaced with the choke (200ma 6H DC 100 ohm) . i am not sure this final voltage ,still well in driving the main circuit ?

Last edited by ckwong99; 17th October 2018 at 01:21 PM.
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