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Old 18th April 2011, 09:23 PM   #1
yero is offline yero  United States
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Default pas filament supply

I am building the pas-3 high level preamp. I outboarded the power supply using two power supplys. The B+ as well as an indepentant 12v filament supply that is not a voltage doubler. my question is do the returns of the two supplies need to be grounded together. I an experiencing 120hz hum.
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Old 18th April 2011, 09:40 PM   #2
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Yes they need to have the commons joined together.

Sometimes the heater voltage is floated of 40 volts to decrease hum.
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Old 18th April 2011, 10:05 PM   #3
yero is offline yero  United States
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floating the heaters at 40v. how is that done
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