[Amps] SB220 ground grids or not?

["Juan M. Chazarra EA5RS" <ea5rs@ono.com>]

I have not found any clear indication on whether directly grounding the
grids of the 3-500Zs on the SB220 is a good pratice or it is best to
keep the original circuitry.
Any opinions?

Thanks,
Juan EA5RS

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