I used Mullards. It sounded great.
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I've tried Siemens Halske CCa's, they were very transparent and linear, had good bass and very clear highs. I'm currently using Amperex Holland 7308's, these, while maybe not as transparent, are more musical and natural sounding. Highly recommended! The Amperex Holland tubes, whether 6DJ8/6922/7308 seem to have an organic presentation that is very attractive.
I owned a CJ17LS and used a AudioPrism power cord and NOS Amperex tubes both of which made a huge improvement. I then upgraded to a CJ16 Series 2. The NOS tubes and power cord made very little improvement to the sound. My local CJ dealer heard the same thing as we did this one Sunday at his store. My recommendation would be to send your 16LS to CJ for the upgrade rather than spend $'s on NOS tubes and a good power cord.