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previous: momo Can you direct couple the grid of a... -- 5/28/2000 6:54 PM View Thread

Re: Cathodyne PI

5/28/2000 8:53 PM
Ray Ivers
Re: Cathodyne PI
Yes, you can do this - it's how I would do it, for sure. You have to make certain that the phase inverter is properly biased, but this method has the advantage of presenting very little loading to the output of the preceding gain stage, allowing you to run a higher value of plate load resistor for more gain if necessary. If you know the B+ voltage and tube type you'll be using, I'll be glad to run the numbers thru TubeCAD for you. AC coupling would require another two resistors (and the coupling cap, of course) but it may be the more flexible approach since the DC conditions of the previous stage no longer affect the PI stage's design.  
Ray Ivers

momo What would be the best candidate fr... -- 5/29/2000 2:22 AM
dutch >You have to make certain that the ... -- 5/29/2000 4:22 AM