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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: Switching from fixed to cathode bias posted by DAK on March 30, 2014 at 16:15:05:
Unless you are operating in Class A, the cathode bias will become a strong function of the power output, integrated over the cathode resistor/capacitor time constant. It's usually impractical to make that time constant longer than the loud passages in music, which may last for several minutes.
That's the real reason fixed bias was developed - to allow the higher power available from Class AB and B operation. The same goes for the use of choke-input filters with their better regulation - power supply droop on loud passages is less.
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Follow Ups
- RE: Switching from fixed to cathode bias - Paul Joppa 18:14:22 03/30/14 (3)
- RE: Switching from fixed to cathode bias - DAK 11:02:12 03/31/14 (2)
- RE: Switching from fixed to cathode bias - Paul Joppa 14:15:24 03/31/14 (1)
- RE: Switching from fixed to cathode bias - Caucasian Blackplate 17:43:42 03/31/14 (0)
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