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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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