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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: Can someone explain DHTs to me? posted by coin on April 15, 2016 at 00:03:13:
There are 2 voltages here:
1. Voltage across the filament. Think of this as "floating".
2. Voltage from one side (or centre point) of filament to ground
Voltage across the filament in a 300b is 5v
Voltage to ground could be 70v
In filament bias, the filament supply (which is floating) goes first through the filament as above, but then continues its journey through the cathode resistor to ground. So for a 26, You would have one amp of filament current going through the filament and then down the cathode resistor to ground. So the cathode resistor in this case is about 10 ohms, so you don't need to bypass it.
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Follow Ups
- Filaments and filament bias - andy evans 00:27:06 04/15/16 (12)
- RE: Filaments and filament bias - Tre' 08:37:33 04/15/16 (3)
- RE: Filaments and filament bias - andy evans 15:26:59 04/16/16 (2)
- RE: Filaments and filament bias - Tre' 16:54:45 04/16/16 (1)
- Filament bias is still a bit left field... - andy evans 03:32:23 04/17/16 (0)
- RE: Filaments and filament bias - coin 00:33:37 04/15/16 (7)
- RE: Filaments and filament bias - euro21 03:29:02 04/15/16 (3)
- RE: Filaments and filament bias - coin 03:40:56 04/15/16 (2)
- RE: Filaments and filament bias - euro21 03:57:17 04/15/16 (1)
- RE: Filaments and filament bias - coin 05:37:23 04/15/16 (0)
- RE: Filaments and filament bias - euro21 03:19:01 04/15/16 (2)
- RE: Filaments and filament bias - coin 03:27:49 04/15/16 (1)
- RE: Filaments and filament bias - euro21 03:45:39 04/15/16 (0)
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