We are perhaps in an odd point in history, where, for the for the finest reproduction of sound, the best parts are behind us. It is hard to imagine that we will have new products developed for such a small and shrinking niche. Fingers crossed on adaptation for parts for other uses, but a little hoarding seems wise.
I thought I'd try the polar opposites first, and then see where to go from there.
I was digging thru the parts bin looking for anything I had to build a M2, or j first watt and somehow had stuffed a set of 2sk170 and 2sj74s in there back long ago(?). I used the 9v battery test with a DVM and found all to be very close to 10.5ma +- .03ma. I read that 8ma is the normal requirement. What might I need to do if I use these higher Idss parts.
though , little heatsinking could help , just to stay on hysteric side 
search for T092 heatsink pictures , then be creative
search for T092 heatsink pictures , then be creative
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