----- Original Message -----
From: "R.Measures" <r@somis.org>
> > Alternatively you could use 4-400s if you wire the screen
> > connectors to the grid, but they need a bit more drive.
> > Mine doing very well in my L4B
>
> - However, in order to get enough ZSAC in a 4-400 with zero V bias,
> one needs c. 3500vdc on the anode - or apply a small positive
voltage
> to the screen with a lower anode supply V.
True, but with zero bias and low ZSAC even at 2KV, IMD is better
then most
transceivers produce.
My tubes are running with 4KV anyway, but I can switch to half voltage
73
Peter
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