I-177 vs I-177A vs. I-177B: any significant differences?

[Mike Dinolfo]

I was fortunate enough to pick up (interpretation: "it was affordable")
an I-177 tube tester, along with the MX-949A/U adapter, at a recent
hamfest.

It's my understanding that these two items, taken together, offer
similar functionality to that of the TV-7* line of testers, but I was
wondering- can anyone tell me if there are any significant differences
between the I-177, the I-177A, and the I-177B?

Thanks!

Mike Dinolfo N4MWP

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