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In Reply to: RE: As I see it.... posted by dave slagle on November 08, 2014 at 13:34:33
The bias is supplied by a bias supply with a precision adjustment pot with one leg to ground.
So the DC resistance from grid to ground is determined ultimately by the setting of this (50K) pot. At the setting used, I will have a DC resistance of 15K or so.
The supply does not need the low DC resistance, but the grid likes not to be offset by high DC resistances to ground.
Love the 'sound' of grid chokes.
NC
Follow Ups:
I'll give you that grid chokes can sound good but I want to see a compelling argument "why"
consider what happens to this input waveform....
when coupled via grid choke to a -30V biased 801.
dave
Is this behavior present always with grid chokes I wonder?
when the LC is well tuned well, this amount of ringing seems avoidable.
As to the why of grid chokes. I guess its a combination of:
1 very high impedance at high frequencies
2. high impedance at low frequencies (when enough inductance is available)
3. very low DC resistance which enables the grid to have maximum control, especially important with low mu triodes.
NC
I've always thought grid chokes were a very difficult way to go, an absolute last resort. The engineering challenges relating to both construction and application are enormous.
--------------------------
Buy Chinese. Bury freedom.
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