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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: Q re: Gridstoppers for 12B4 posted by Eli Duttman on January 22, 2007 at 18:32:54:
You may not need any grid resistor at all with a well laid-out 12B-4 stage (I haven't needed them in my 12B-4 stage). Try it and see. In either case, there is no good reason not to use both leads running to the source. This halves inductance compared to using just one wire. Good short layouts should come first though, and then grid stoppers only when needed after that, IMO.I agree with Eli's general advice. The first goal is to reduce series inductance in the grid circuit that will resonate with grid capacitance. Using two grid stoppers in parallel not only halves the resistance value (which you can choose at will), but, significantly, halves the inductance too. The 5842/417A is a more extreme example of a high gm screamer. It has FOUR grid pins to lower inductance. It would not crazy to use four grid stoppers in parallel, one to each grid pin.
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- Re: Q re: Gridstoppers for 12B4 - BBeck 07:39:50 01/23/07 (0)
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