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In Reply to: RE: Can a grid choke be used with a high rp driver? posted by Iczerman on April 25, 2015 at 16:26:15
what size grid resistor would it be replacing.
then do a quickie calculation of the inductive reactance.
compare the two.
The larger hurdle with the high impedance driver is getting
the plate choke's L where you want it.
That is, unless your using a CCS or a plate resistor.
MSL
Builder of MagneQuest & Peerless transformers since 1989
Follow Ups:
The grid resistor would be 270K coupling cap .1uf.
The inductive reactance for that silk 6000H at 5HZ is 188k ohms.
So..it's my assumption that that plate resistor would have to be around 188K also?
Triodes normally want to see a load impedance at least three times their plate resistance to keep the gain up and the harmonic distortion down.The value of the plate resistor in parallel with the reactance of the choke gives the load impedance the tube see at that frequency.
In the mid-band the reactance of the grid choke will be very high.
The value of the plate resistor is in parallel with the plate resistance to give the output impedance of the stage.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 04/25/15 04/25/15
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