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Vintage threads from the first ten years
DC Heater Wiring
 9/22/2004 11:29 PM |
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| Ed | DC Heater Wiring I was having a problem with 60hz & 120hz hum. Have greatly reduced the problem. However, some 120hz hum remains. Neither the PT 6.3v center tap or a 100 ohm artificial center tap seemed to have helped much. Nor did referencing the heater voltage through the cathode resistor. I have installed a bridge recitifier & 400uF cap to convert the 6.3 heaters to DC. The PT center tap is now taped off & the negative of the bridge is grounded through a .1uF cap. With the DC heaters, what is the best way to ground the circuit? Can I still use the PT center tap (& disconnect the ground from the bridge?)? And can I still use the cathode to reference the heater voltage? How would I wire that? Thanks. -Ed |
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| Replies: |
| Bruce /Mission Amps Changing the rectifier circuit to D... -- 9/22/2004 10:28 PM Brutus Just a word of caution. If all you... -- 10/3/2004 4:23 PM Brutus To resolve your 120 hum problem, te... -- 10/3/2004 4:35 PM |