> 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.
What particular 4CX1500 do you have? The A or the B? There
is a huge difference.
The 1500B generally should be used at zero or very near zero
grid current.
> 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?
You better not run the 4CX1000A anything but sub-class 1 (no
grid current).
If you limit the screen dissipation properly, you won't need
to worry about interlocking the screen. If you don't limit
dissipation, you will eventually cook a tube even with the
interlock.
73 Tom
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