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(ET) Got it in one guess (E20 problems)
Yup, swapped in my old card4 (has a dead SCR) and speeds 1-5 are back
online.
Haven't looked at this card yet, but my guess is it's two of the four
diodes that are in the rear. They control field current regardless of
direction, and I think they take a real beating.
What bothers me here is that this was a new old stock card I got last
year or so. Which means the diodes on the E20 are either undersized or
degrading due to physical age. If this is the case, then I really feel
for people who have E15's; with those electronic controls you could have
a real basket case on your hands.
Chris