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Old 18th October 2011, 02:46 PM   #31
DF96 is offline DF96  England
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Join Date: May 2007
It was probably an attempt to reduce supply noise which has been capacitively coupled to the heater winding. I'm not sure it will help. However, it perhaps hides a more serious error: no DC reference for the heaters. There should always be a DC path from heater to cathode, with a resistance of no more than 10's of K. Some exceptions, but that is the general rule. Some datasheets mention this, many don't but put it in the general advice at the start of the data book.
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