I suspect that the 45000 is a cost reduced version of the NTGS0AA. It has to
be cheaper to produce and install a single board rather than two boards
connected by a cable. Also the 45000 has considerably fewer parts than the
NTGS50AA. They probably decided that they did not need as much gain and
dropped an amplifier stage. It is a solid 6-7 dB less sensitive.
Another possibility is that they updated to board to get rid of some obsoleted
components.
My 45000's have the 34310-T (not T2) oscillators. After 4 days they are
ageing at a rate of -5E-10 parts/day. This is a factor of 10 worse than the
-T2 version was at the same time. Also the OSC and PPS numbers are
considerably worse. It would be interesting to put a -T2 onto the 45000 board
and see how it performs (i.e. is it the board or oscillator).
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