I'm trying on CCS for filament. Below is my simple schematic. I've got problem that I can hear vibration noise at quite high level in first 25-30 seconds. Filament voltage increases step by step. When Vout reaches 2-3Vdc, that noise dissapears. I guess filament string shaking a lot in early periode. Those noises are only for directed heater tubes (2E22, 6B4G, 300B are my cases), not for indirected heater tubes(ex. 6L6, 6550)
I have some questions :
What is the cause and how to treat it ?
Does that phenomenon impact in filaments quality of directed heater tube, also tube quality too ?
Thank you,
QA.
I have some questions :
What is the cause and how to treat it ?
Does that phenomenon impact in filaments quality of directed heater tube, also tube quality too ?
Thank you,
QA.
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