Some additional information I would add:
1. The X-202B was not a new model, but a continuation of the X-202-line -- this because the X-202 was produced up to serial number 39999, while the first X-202Bs started production life as serial number 40001.
2. The first 10000 units produced employed the older style knobs with brown inserts, and is also characterized by the following:
A. The Center Channel Level control controls the center channel line level (RCA) output jack.
B. The headphone output was significantly reduced in level.
3. The next 10000 produced (50001 - 59999) employed the newer knobs with brass brights, and is also characterized by the following:
C. The Center Channel Level control is now a multi-position switch, allowing selectable output levels for the powered center channel speaker output. In the previous version, the powered center channel output level was fixed.
D. The line level Center Channel output (RCA) jack level is now fixed. In the previous version, it was adjustable as detailed in A above.
E. The headphone level was corrected in this version to the standardized level offered in all Fisher products offering a headphone jack.
F. The line stage gain is slightly increased in this version.
Dave