[Amps] drake l-4b from 4-400 to 3-500

[DF3KV]

----- Original Message -----
From: "R.Measures" <r at 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