Many thanks to SWLing Post reader, Trevor, who writes:
You might wish to share this with your readers. An example of an excellent commercial rack-mounted receiver at (what I would consider) a reasonable price on eBay: the Harris RF-550.
If I lived in The States, I would buy it. Sounds like it’s had a go-over with a technician, checks out and the seller has 100%. Shipping is reasonable, too. BuyItNow at $975 or (current bidding at $750).
Thanks for the tip, Trevor!