[Amps] Replace 2x 4-400 with 2x 3-500ZG

[Posselt Werner]

Hello!

Is it possible to swap the 4-400s with two 3-500ZG without any further
modification?
The tubes are operating in grounded Grid configuration.
The HV supply is homemade delivering 3,3KV.
How much increase in power output can I expect?

Thanks for your answers!

73, Werner
    oe2wpo