6922 Amperex PQ White label... D or O-getter? Holland or Hicksville?

I've tried the 6922/E88CC PQ from both Holland and US. As far as I could tell, both had the liquid and rich midrange that this tube is known for. 
But, the 7308 Amperex PQ  from Holland has outstanding dynamics with the most liquid and warm mids. The E88CC doesn't have the deep low-end of the 7308.
BTW, the Philips SQ Holland is the same tube as the Amperex PQ. They are often substituted due to availability.

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.

I don't think the 7308 is mil spec. It's heater is rated at 7V while the 6922, 6DJ8 is 6.3 volts.

Wow @rodman99999 , that's the good stuff. These are mil spec matched with tight tolerances.

@pmboyd , there is no diminished midrange in these tubes. It's the wonderful liquid mids of an Amperex tube.
The 7308 presents a more powerful, deep low-end than  the 6922/E88CC.
Don't get me wrong, all the PQ tubes have great sonics. Much more realistic and smoother and without the the grain of the Bugle Boys.

@tomcy6 , I think you're right about the Amperex Holland having the best midrange. And I've heard a difference between the small and large O-getters.  
I agree the D getter may add the warmth and richness.

Since we were speaking only about Amperex, I'd like to add that I'm now using a pair of 7308 1960 Philips SQ large O-getters in my Dac. These are more neutral with low-end slam and the midrange of the best Amperex. They were a Brent Jessee recommendation and replaced the US Amperex PQ.
 

I can say for sure that the Holland 7308 Amperex PQ and Philips SQ have a fuller sound from top to bottom with deep liquid mids.

Edit...very lively tubes.

@rodman99999 , I checked my records and the USN Amperex only have large O getters. I had a pair of USN 6922s and returned them since they didn’t have an extended low-end. They weren’t too warm; maybe it’s the higher voltage of the 7308 that adds the warmth and richness to the tube.

Here’s my take on Amperex US vs. Holland 6922 PQ...
US is more focused and extended.
Heerlen, Holland has smoother highs and sweeter mids.