[Amps] Gettering 3-500 Tubes

[R Johnson]

I have just been given an old SB-220. It has been sitting in an attic for 20+ years.

I have removed the tubes and have been bringing the voltage up slowly
to reform the filter caps. When I get to 120V in and the caps aren't steaming 
and/or blowing smoke I'll be ready to check it with the tubes installed.

I know that the need 3-500's will need to be "Gettered" to remove any gas diffusion
thru the metal to glass seals on the tube.

I read a procedure on (probably) on this list on how to do it.
Now that I need it, I can't find it.

Does anyone remember this thread within the last 3 or 4 months ???
If not,can any recommend how to cook these tubes in ???

TNX es 73
Bob, K1VU