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EL34 Baby Huey Amplifier
EL34 Baby Huey Amplifier
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Old 7th December 2018, 04:30 PM   #191
bandol83 is offline bandol83  France
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Like that...
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Old 7th December 2018, 05:57 PM   #192
ckwong99 is offline ckwong99  Hong Kong
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does it a shunt type or series type supply ? The o/p voltage is adjustable ?
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Old 17th December 2018, 06:46 AM   #193
ckwong99 is offline ckwong99  Hong Kong
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Hi All. I need to put all high and low voltage recitifer and low voltage regulator with AC power source into individual case. Due to my amp case not large enough and want less pay $ for my another tube amp (it can reuse this DC supply). I am not sure this arrangement, all DC given from seperated box will have any problem and concern that i need pay more attention in advance ?
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Old 17th December 2018, 11:05 AM   #194
bandol83 is offline bandol83  France
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Hi ckwong99,

For the EL34 Baby Huey, you can use DC or AC voltage for the high voltage (max 275 VAC or 385 VDC if using 400 V capacitors) and for the 6.3 V heater, BUT YOU MUST USE ONLY AC for the 50 V bias & driver supply because the positive AND the negative voltage are rectified on board from the AC input

The power supply for the preamplifier is serial type and fixed by 3 x 100V Zener, of course it is possible to use different Zener values

I have also made a variable one with a regulator, see picture...

Rgds,
Marc
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Old 17th December 2018, 11:16 AM   #195
ckwong99 is offline ckwong99  Hong Kong
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Thx . i know that but i only want to know if external suply give dc to amp (except 50vac) . whether it will have problem on a long transmission dc power line for high voltage and filament low voltage ?
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Old 22nd December 2018, 08:52 AM   #196
kp93300 is offline kp93300  Malaysia
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Is this GB 2 or 3 board? What's the value for R39?
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Old 22nd December 2018, 09:05 AM   #197
bandol83 is offline bandol83  France
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R39 is dependent of the bias voltage and of the output tubes, with 50 VAC as recommended it can be between 10 k to 18 k without problem. In older BOM it was specified at 39 k which is definitely too high

Rgds,
Marc
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Old 23rd December 2018, 04:07 PM   #198
bandol83 is offline bandol83  France
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Default Updated BOM for EL34 & EL84 Baby Huey

Hi Happy Baby Huey Builders,

To make your DIY work easier, I have made a new updated BOM for both EL34 and EL84 Baby Huey PCB

I do not plan to make a separate thread for the EL84 Baby Huey because both versions are very similar and I think it is better to have all the information in only one thread.

For those who are interested by the history of the EL84 Baby Huey, they can read here EL84 Amp - Baby Huey the long thread started by Ian (gingertube) in 2006 !!! This is where all started for me in October 2016 (post 1670), 10 years after the first post, and at that time I would not have believed that more than 500 PCB that I have designed will be built, I didn't even know how to make a Group Buy and hopefully after the two first GB of 200 boards, Prasi accepted to continu the job and has produced 300 boards more

Now the Baby Huey story is finished for me and I hope to have the time in 2019 to make my long delayed Quad KT120 with Cathode feedback and autobias

Merry Christmas and Happy New year,
Marc
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Old 23rd December 2018, 07:27 PM   #199
huggygood is offline huggygood  France
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merry Christmas Marc !!
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Old 24th December 2018, 02:31 AM   #200
overtheairbroadcast is offline overtheairbroadcast  Canada
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Merry Christmas and have a good set of holidays. Hope all will be good for you in 2019!
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