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In Reply to: RE: Limiting low frequency response of SE amp posted by Randal P on February 04, 2017 at 06:13:10
Rolling off at the I/P is very easy. "Plug" the grid to ground resistor value into the RC filter formula.
Eli D.
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It is the same as this guy: http://www.audioasylum.com/cgi/vt.mpl?f=tubes&m=259009
Dennis doesn't provide (or even use) schematics and my tube amp building knowledge is rudimentary at best.
RC filters follow a fairly simple formula.
(2Π) (C farads ) (R ohms ) (F hertz ) = 1
Any 2 of the 3 variables define the 3rd.
In the case of "El Cheapo", the 0.056 μF. cap. and 100 Kohm resistor "corner" at 28.4 Hz. Here, the filter is high pass.
Eli D.
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