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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: Can a coil replace a gridstopper? posted by Nickel Core on January 27, 2007 at 13:15:04:
This is apples and oranges. In HF transmitters, the RL network is placed in the anode lead. The parallel RL combination is used because it creates the equivalent of a low Q inductor capable of withstanding the current at the operating frequency. If not for that current, a simple resistor would be much more effective at dampening oscillations. In order to understand this, it needs to be pointed out that the goal is not to create a high series impedance at the anode at undesired frequencies. That would merely remove the load from the tube, allowing it to oscillate at some natural frequency determined by its internal LC parasitic values. The same is true at the grid, but because there is little or no current, the unductor is unnecessary. For audio, we can use the best possible parasitic dampener - a simple series resistor - and not worry about the complex effects of unloading the grid with an external inductor.
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Follow Ups
- No, a coil can't replace a gridstopper... - Triode_Kingdom 21:10:44 01/27/07 (3)
- Ah. Good one... there is no current! (nt). - Nickel Core 06:22:47 01/28/07 (2)
- Actually there is a VERY small current ... - Naz 20:02:07 01/28/07 (1)
- Grid stoppers wouldn't be needed at all if there were no grid currents... - BBeck 05:56:44 01/29/07 (0)
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