National HRO-500 Receiver Demo After Refurbishing

I have just finished working on this National HRO-500 solid-state synthesized receiver dating from around 1965. All electrolytics have been replaced along with around 15 resistors and a Zener diode. The receiver was then fully re-aligned and is now functioning very well on all 60 band segments from 5KHz through 30MHz, easily meeting spec. I also refurbished the matching LF-10 LF/VLF preselector and there is another video demonstrating that in use with this set,

[@6643bear]

Great video, nice radio, over 40 years ago I had a nc120 radio when i fit into swl, regards mark

[@RadioRestoration]

Glad you enjoyed it Mark. It is certainly an interesting receive for all sorts of reasons.

[@richardross3815]

The dreams of our youth… lol
Nice work as usual Gerry

[@RadioRestoration]

Thanks Richard. Indeed - this was certainly an unobtainable radio when I was starting out! I used to read through the US ham radio magazines and QST with mouth wide open at all the goodies in the adverts!! FYI, I have written a detailed article on this refurbishment - it should be posted to the SPARC radio museum website soon

[@M0XFXUK]

A thing of beauty, interesting that it has synthesized tuning dating back to 1965 and a PLL in lock indication light. Really nice looking receiver too, I would be interested in how well it performs. Thanks for posting the video. Best regards, John M0XFX

[@RadioRestoration]

Hi John. It performs very well, especially considering all but a couple of the 37 transistors are 50 year-old germanium types, and, as far as I know, are all original. It is able to detect SSB/CA and AM signals