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previous: Stephen Conner Personally, I've never heard a g... -- 11/4/1999 3:27 PM View Thread

Re: U.L. Fenders (calling Ken Gilbert)

11/4/1999 3:59 PM
Dave Stork
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Re: U.L. Fenders (calling Ken Gilbert)
If you really wanted to, you could use a big choke in place of the grid resistor. That would offer a high impedance to signal while keeping the grid near DC ground, minimizing unintentional "grid leak bias" pushing the tube into a nonlinear operating class. Transformer coupling will do the same thing as the choke. Neither approach is as cost-effective as using a smaller grid resistor and a lower-impedance driving stage, or using a series grid resistor (grid stopper) to reduce loading on the driving stage when the grid is driven into conduction. In my own overdrive preamp designs, I use fairly big stoppers (>100k) in series with the grids, which also helps a lot in preventing high frequency oscillation.

 
Replies:
Doc I wondered if Scott has any grid st... -- 11/4/1999 5:32 PM