Hello all, I have a 10 tube 24lq6 with a 6kv6a pre driver tube. The number 2 driver tube 24lq6 is red plating with just a few seconds dead key or talking. I've changed out the z14 plate choke, the 47ohm parasitic suppressor, 100 ohm cathode resistor, .01uf filment decoupling cap . Also tried swapping tubes ended up killing 2 know good tubes..Out of 10 final tunes only one is cherrying.. any help or direction is appreciated.