Many thanks to SWLing Post contributor, Rich Stahl (WR3V), who writes:
FYI, a Muzuho SX-3 preselector just showed up on eBay.
Rare as hens teeth, and said to be excellent units. Looks to be in nice condition.
I’m not that familiar wit the Muzuho SX-3, but it does appear to be a quality unit and has great reviews. Preselectors can be incredibly useful to radio enthusiasts who live in the presence of blowtorch signals or who have sensitive receivers that can easily overload. Thanks for the tip, Rich!
I obtained a SX-59 Mizuho preselector last year and have just started using it on my main incoming line to a multicoupler with 16 outgoing ports. It provides some really nice amplification and makes up for some gain loss between my four loops. As long as one remembers your location on the bands and re-peaks the unit, this is a really good solution to those of us seeking more gain with some adjustability.