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screen modulation again...




 
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Author Topic: screen modulation again...  (Read 97261 times)
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IN3IEX
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« Reply #275 on: January 02, 2016, 04:29:37 AM »

While developing a tube hifi amp I also
observed that  when the ps diodes switch on to "refill" the first capacitor (120 Hz) strong pulses of current flowed through that circuit. Pulses of em field were also emitted by the ps transformer, these pulses were detected by the magnetic pickup at 1 m  distance!!
Anyway, to avoid having current pulses going around the chassis, it is always better to install all ps components on an insulated separate board,  then connect the ground of the last capacitor of the ps to the main chassis.
A ~10 ohm (or higher)  resistor in series with each diode can also mitigate the peak value of the current pulse.
Have  fun!

Giorgio
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