It appears they have already? been notified that their proposed? cathode driven config...with both screen and grid bonded to the chassis? is fubar, and the poor control grid will vaporize....with 20 kw pep of drive into the 500 watt rated grid.? ?It wouldn't work anyway, their fil choke is a total write off.?
Dunno where? BBI? got this idea that he needed a 4CX-15,000? as a 1400 vdc? screen regulator.? ?A simple? FWB +? resonant choke, and bleeder would easily suffice...and have superb regulation.?
Dunno if they will take the kind advice of some fellow? 11m? builders who explained? this all? to? De Luna + BBI.? ?The other builders have succesfully built grid driven 4CX-5000 amps, complete with screen and bias supplies, then terminated the grid with a grid loading resistor.? ?So far, they have not responded.?
If they do, they? will have to rebuild the $4K? socket...and replace all the screen bypass caps? and unground both the screen and control grid.?
If they don't take the sage advice,? they can kiss the control grid goodbye.?
