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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Something I don't Understand... posted by Lee of Omaha on November 11, 2014 at 15:13:18:
Even though the heater is not coated with emitting material, some thermionic emission occurs and its level oscillates at the power mains frequency. By making the heater positive with respect to the cathode, the "oddball" thermionic electrons don't create a current between heater and cathode.
Eli D.
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