Help With Multi-Elmac AF-68 Grid Bias?

[DavidC]

I asked a friend about replacing the Burgess #U-15 22 1/2v battery used for
grid bias in my recently acquired Multi-Elmac AF-68.  This is what he
wrote:

> I supplied a -22.5 volt line from the powersupply as there was/is a spare
line in the plug.
> Another method is to lift the cathodes and insert a diode as making the
cathode more
> positive is the same as making the grid more negative.  You could
probably get by with
> a pair of 9 volt batteries in series, which would run about 20 volts when
new.

Which of these is preferred, and why, please?

Thanks & 73, DavidC  AA1FA

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