Who had measure 4CX250B's or 4CX1000A's 3rd IMD order in gird driven and cathode driven?There are few amplifier using this configation, only THP HL-1K and Collins 30S-1.Which is better?I had post simlar question to reflector, a guy told me allmost same performance.But I measured 813 in Grid driven and cathode driven ,it seems cathode driven is better.
73!Hsu