Quote:
Originally Posted by WA3WLJ
Isn't there a small copper tube nipple under or around the Black pin base?
If the filaments are good and then the base carefully removed; couldn't one vacuum pump the tube back down to around 1 X 10-5 or 1 X 10-6 ,and after applying VAC-U-Seal over the leak paths while still pumping (of course) . But then again you would only tap into this tube nipple if you knew the tube had already gone to air.
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Unfortunately, not all of the air can be removed with a vacuum system alone.
You can read more about the process by searching this forum for "15GP22".