Oh yeah, D vs. O-getter. The D getter is in the earlier construction of these tubes and is said to be superior. I have D-getters since my tubes are from the 1950s, so I can't speak to the difference.
The same can be said of small O getters vs. large. I do have some experience here; large O getters are superior, perhaps they create a greater flash and a better vacuum.
The same can be said of small O getters vs. large. I do have some experience here; large O getters are superior, perhaps they create a greater flash and a better vacuum.