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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:
I was thinking the parallel choke across the resistor might be useful at the grid of the input stage of a preamp, where the thermal noise of the resistor is in series with the input (independent of any current flowing through the resistor). The choke would short out the resistance at audio, and keep the resistance in the circuit at r.f. For example, a 10 k resistor (13 nV/rt Hz) would be excessive in a phono preamp, but could be shorted out below 20 kHz by a 1 mH choke. Above roughly 2 MHz, the circuit looks like a 10 k resistance. This would require a pi-wound phenolic (air-core) inductor, not practical to wind around the resistor body.
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Follow Ups
- Re: Can a coil replace a gridstopper? - TimFox 07:02:04 01/28/07 (4)
- Re: Can a coil replace a gridstopper? - Triode_Kingdom 17:23:01 01/28/07 (1)
- Re: Can a coil replace a gridstopper? - TimFox 11:04:34 01/29/07 (0)
- Hmmm. - Nickel Core 11:00:33 01/28/07 (1)
- Re: Hmmm. - Triode_Kingdom 17:34:03 01/28/07 (0)
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