|[AMRadio] 100TH and 250TH advice and or comment|
rbethman at comcast.net
Tue Aug 25 13:06:11 EDT 2009
That's my take on this too! At least from past experience.
I'm just puzzled by the occurrence. I doubt that there is 25 hours of
actual plate power applied, I.E., key down. I don't make the "old
buzzard" routine talks. I've always been in a round table, most being
technical in nature regarding AM ops., equipment, and such.
I wonder if maybe these old tubes are at the point where a muffin fan or
two ought to be added to the Old Gals.
Bob - N0DGN
Bernie Doran wrote:
> The milky white appears when the tube has lost its vacuum and fil power is
> applied, I have seen this vapor of death more than a few times when testing
> old fellows. This is not to say that this is the only reason for the white
> deposits, but it is the only way I have seen it form. Bernie W8RPW
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