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Vintage threads from the first ten years

previous: PAUL C These 2 resistors will affect the t... -- 9/9/1997 8:53 PM

Re: Preamp-Plate & Cathode Resistors

9/24/1997 9:18 AM
eth	Re: Preamp-Plate & Cathode Resistors In the second to last sentence you mentioned getting rid of the 68k grid stopper resistors to improve tone because of your tube being able to handle hotter signals. The grid stopper will not actually decrease signal input because of the extremely high input impedance of the grid. The grid does have capacitance to the cathode, which combined with the 68k resistor creates a high frequency roll off at around 10khz (I think). Anyway sometimes I can't stand the brightness of my home-made amps so I use these... Yeah, that was a great post. Take it easy!-eth

9/24/1997 9:18 AM

eth

Re: Preamp-Plate & Cathode Resistors

In the second to last sentence you mentioned getting rid of the 68k grid stopper resistors to improve tone because of your tube being able to handle hotter signals. The grid stopper will not actually decrease signal input because of the extremely high input impedance of the grid. The grid does have capacitance to the cathode, which combined with the 68k resistor creates a high frequency roll off at around 10khz (I think). Anyway sometimes I can't stand the brightness of my home-made amps so I use these... Yeah, that was a great post. Take it easy!-eth