I have decided to build a 4CX1500 amp. I have a couple of tubes and sockets
already. I know that it is designed for class AB2 service for very low
distortion. This seems to limit the tube to 1100W output. I am considering
adding a switch to change the screen and grid bias to allow me to run it in
AB1 service as well for 1500W output.
I do know that if the tube looses screen bias when the plate voltage is
applied catastrophic damage to the tube can result, so I will use a lockout
mechanism to prevent switching when HV is on. In addition, separate bias
pots for each setting.
Is there anything else I need to look out for? The specs do not show AB1
service, but I assume it can be set up the same as a 4CX1000. Am I wrong?
Thanks,
Mike, W1NR
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