Difference between "R" and "G" Tube numbers

arcadeaction

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Difference between "R" and "G" Tube numbers

Just curious, is an R-A63ADG25X tube actually the same or different than a G-A63ADG25X? Does that letter determine the degree (90 or 100) perhaps?

A R-A63ADG25X is shown to be a tube replacement for a 25" Amp, but a G-A63ADG25X is a tube for a K7000 I believe.

I am just sorting some spare tubes I have.
 
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