Which has richer tonality, the Holland e188cc or the USA 7308?

Still in search of the perfect tube?

I like the liquid midrange on the Holland. I think it comes down to your taste in sonics.

Oh yeah, I love tube rolling. I may be as discriminating as you are.

Did you ever try the USN7308 (or 6922) Amperex offered to you?

@pmboyd , have you tried a 6922 PQ Holland?

From Brent Jessee...
Fabulous original 1957 D-getter vintage white label Holland made PQ type Amperex tubes, and have the rare, indented glass midsections ("pinched waist")and wider bottoms that are famed for ultra-low microphonics. These 1950s pinch waist tubes are rarely found, since they are so fine most are in private collections and stocks!

@petg60 , I agree to go for the white label.
I've been following @pmboyd 's quest for a specific sonic signature. I like the 7308 Amperex PQ/Philips SQ Holland large O-getter for it's transparency, warm liquid mids, deep low-end, and smooth extended highs. Not a rich sounding tube. 
@pmboyd , maybe you would like the D-getter version, although hard to find.