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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: RE: Quick question: How do you filament bias a tube that does not have a filament? posted by Nickel Core on October 16, 2014 at 07:02:39:
I think you need to understand why people use filament bias before you look at an indirectly heated tube and pronounce that it's a good idea.
In your 437A phono preamp, you have the advantage that noise in the heater supply has some isolation from the cathode. If you try to integrate the heater supply into the bias supply, you will introduce a lot of noise.
You cannot filament bias an indirectly heated tube because it has no filament, period.
The arrangement you are describing is more like tapping the heater supply for a fixed bias voltage.
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Follow Ups
- RE: Quick question: How do you filament bias a tube that does not have a filament? - Caucasian Blackplate 10:39:45 10/16/14 (3)
- RE: Quick question: How do you filament bias a tube that does not have a filament? - Nickel Core 10:50:52 10/16/14 (2)
- RE: Quick question: How do you filament bias a tube that does not have a filament? - Caucasian Blackplate 10:54:46 10/16/14 (1)
- RE: Quick question: How do you filament bias a tube that does not have a filament? - Nickel Core 11:06:00 10/16/14 (0)
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