Hi Charlie,
interesting video segment on that tube. If you would like a super top end boutique guitar amp or pedal based on these subminiature tube types, check out www.siegmundguitars.com, check out their Missing Link volume boost pedal, their Micro Tube Doubledrive pedal, and especially their Muddy Buddy recording amp... 8)
I own a Double Drive, and it has some really gorgeous clean and amazingly smooth, complex, richly harmonic dirty tones that just don't come out of any 12__7 type, amazing.