I have not tried nor confirmed but I have been told that the grid choke would not work well with a CCS or choke loaded driver. If one looks at "historical" amps you always see a "R" in there someplace...like LCR or RCL. My grid chokes will also be replacing 220K grid leak resistors. I am going to use RCL coupling and will try 0.47uF cap first...if I have a bass boost I might go up to a 1uF cap or perhaps play with a resistor in series with the grid choke (I'd like to avoid a resistor across the grid choke). I am now obsessing about where to place them (four of them) in my chassis as I hear they are prone to picking up noise.

Russ