Received some matched 3S4 tubes today for my Quickie - not so much because I expected matching to be important, but because I was getting a nasty hum anytime I went anywhere near one of the 2 supplied tubes.
The new tubes have rendered the Quickie completely silent and I've now added it to my signal chain thusly:
PC --> X-Sabre DAC --> Quickie --> S.E.X. --> Beyer T1s
The sound is magnificent. Rich, full and smooth. Not quite as detailed as a direct connection to the S.E.X., but overall more enjoyable I think. I'd probably remove the Quickie for analytical listening, but think I favour it for general enjoyment listening. The bass is richer and the sound from the T1s is completely fatigue free.
As a bonus, the tubes I received are Australian made!!
Now if only my aluminium chassis would show up so I can take some sexy photos and formally review the mighty Quickie!