wrote:

"The **actual plate voltage** swings up to nearly double in operation, single ended or push pull. The 2.4kV figure I posted is the max, zero current plate voltage that is guaranteed. IOW, the insulation rating. "

I am not exactly sure what you're saying here. Are you saying that tubes such as this are rated in such a way are expected to operate at twice their "max" rating ?


** What I am saying is simple:

The only *plate voltage limit* on a power tube is the breakdown voltage of the insulation.

The usual weak spot is between pins 2 and 3, the heater and the plate of many audio power tubes. Having a plate connection on top of a tube instead helps a lot.

The other limits are with max cathode current and max dissipation of the plate structures or screen grids.


...... Phil