Francois.? No problems with removing all those grid caps and grid chokes.? ?Save the 2 x grid chokes.??
Use 3 x separate copper straps? for each tube....then bond the? 3 x grid pins directly to the chassis.? Best mod for those amps yet.
IMD improves a bit.? And also less drive required.?
But with any bias diodes installed, more drive required to overcome the grid bias,? ?so it's like one step forward.....then one step backwards.? ?It comes out a wash.?
