Lineage of the SX-101
compiled from emails

SX-101 and SX-101 MK1: have 11 and 160 meters; no product detector


SX-101 MK2: same as above plus improved stability

SX-101 MK3: same as above plus oscillator filament is always on


SX-101 MK3A: same as above except 160 meters dropped, 6 & 2 M converter position added, 11 meters retained



SX-101A: 160 and 11 meters dropped, converter position added, product detector added, full 10 meter bandspread

The 101A had IF frequencies of 1650 & 50.75, while the SX101's had IF frequencies of 1650 & 50.5.

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