>There is a bit of debate between Polish and Ukrainian amp builders.
>The some members of the Polish school argue, based on some American
>literature, that a valve (ceramic) should be based vertically, while some
>well known Ukrainian builders, have there GU74b's amps horizontal.
>Now some Poles maintian horizontal is bad as, as for lack of a better
>word, "pollutants" which occasionally fall from the anode land on th grid,
>rahter than at the base of the valve as would be the case if the valve was
>verticle, and this eventually causes a short in the valve.
** I would go with base down. I have seen many 8877s/3cx800A7s-et
cetera with gold-sputtering 'pollution' that were still usuable if the
gold meltballs could be safely parked in the base.
>My feeling is that rather the cooling problem is the issue here, but I
>wonder s the valves were designed with the though in mind of working in
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