Peter, Thank you very much for your nice information.
Peter Chadwick wrote:
> Of course when you're swapping your 211s at a few hundred hours, you're not
> going to notice it, are you?
As I mentioned in my previous post, I swap my 211's every
half year. This is intended to reverse the DC polarity
for each tube's filament. I was not aware of the
migration, but aware of no-uniformity of bias along
with the length of the filament and palate dissipation
depending upon the related area on the anode.
Anyway, I am doing correct procedure at migration point
of view, too.
'73 de JA2DHC/1 Kazuo Ohashi
QTH: Fujisawa, Kanagawa, Japan
PBBS: JA2DHC@JL1ZND.11.JNET1.JPN.AS
WebPage: http://www.ny.airnet.ne.jp/ohashi/
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