eBay Find: “exceedingly rare” National HRO-500 Receiver

national-hro-500-receiver

Many thanks to SWLing Post contributor, Dan Robinson, who writes:

The number of times a shortwave classic becomes available in this condition over the course of decades, can be counted on two hands, let alone one in new unopened condition:

Click here to view on eBay.

Thanks for the tip, Dan! I’ve never seen the HRO-500 in person, but it looks like a beautiful rig. I love the simple front panel and the classic HRO tuning knob.

I wonder what this HRO-500 will fetch!?!

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4 thoughts on “eBay Find: “exceedingly rare” National HRO-500 Receiver

  1. Hank Michalenka, CPA

    I have an extremely fond memory of the HRO-500, never having dreamed of owning one.

    I was at the NASWA/ANARC convention in Wakefield, MA in the early 70’s when Max Fuchs of National Radio entered the meeting room with a radio under his arm, approaching the table in front. Max then threw this radio about ten or twelve feet, hitting the top of the table, bouncing past it and onto the floor! He said: “This is the HRO-500. Don’t worry, it’s indestructible.” Everyone gasped when this radio (which would probably be at least $10K in today’s dollars when it was new) was flying and eventually came to a stop. Might have even been a few tears in the crowd.

    I wonder if the electronics would have held up in the past 40+ years? Fortunately I have the ability to purchase something like this; unfortunately, living in a horrendous DX location valley for almost 40 years (where I don’t even get over-the-air TV). my DXing is confined to vacationing. Any thoughts as to whether the group thinks this is worth the $$$? Not exactly an airplane-travelling receiver…

    Reply
    1. Michael Black

      How embarrassing if the receiver hadn’t worked.

      The 500 used germanium transistors and those generally have had problems over time. That issue is compounded by the lack of new production of germanium transistors.

      But people have written about resurrecting the 500, so they’ve found replacements. It’s a hefty receiver despite transistors. Hard to work on I gather, but in the same way working on any top end receiver is, no built on a single circuit board here.

      Electrolytic capacitors may need replacing, though maybe it being a high end receiver, higher quality capacitors were used.

      I’ve read that it’s still a decent receiver. I guess that surprises me, it’s pretty early in solid state development, just a few years before transistors didn’t do much beyond the broadcast band. A lot of transistorized SW receivers of the era were not very good.

      It uses an analog synthesizer, lots of alignment if it is needed, but it’s likely clean output. The VFO is analog, and no frequency counter. Tuning to a new 500ZKHz segment my be finicky, you’re in essence tuning the oscillator until it locks, not setting dial which then locks the oscillator. The circuit is somewhat similar to the Wadley loop, which is why some think the Wadley loop is used in places it isn’t. But there is a similarity in moving to the next 500KHz step, as seen by the operator.

      Other than the synthesizer, it’s a straightforward receiver, other factors determine it’s usefulness, but given the original price, one would hope it was a decent receiver.

      We all drooled over it, but for most, we never even got close to one.

      Michael

      Reply

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