[time-nuts] Is SC the most stable cut for lowest phase noise?

[Bruce Hunter via time-nuts]

My only experience with SC-cut crystals is that time base oscillators in later 
EIP/Phase-Matrix counters with SC-cut crystal oscillators seem to warm-up from 
a cold start and stabilize more quickly than earlier AT-cut versions.  I was 
surprised to see from Jeff Cartwright's paper that SC-cut crystals operate at 
higher temperatures.  Could this rapid warm up characteristic be attributable 
to oven design rather than crystal cut?
Bruce
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