The History and Identification of National HRO Receivers

From its introduction in 1934 the National HRO found acceptance by a wide range of users, from radio amateurs, to the airline industry, to code breakers at Bletchley Park. The long production history and wide range of models can lead to some confusion on just which HRO you're looking at.
Join Brian Harrison, KN4R, as he discusses the early history of the HRO receiver and the identifying characteristics of the various National HRO models and their clones.
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[@scotty3114]

A very informative presentation! Enjoyed it very much!

[@shortwavesurfer7222]

Fabulous overview!!

[@W3GMS]

Wonderful presentation on my favorite receiver line of the 30's Joe-W3GMS

[@thevintageaudiolife]

I have a few HRO's, easy to repair and once you replace caps and resistors and do a RF alignment, these receivers become amazing good performers.

[@chansetwo]

What is displayed as a HRO-7R in this video is actually an HRO-7C. The 7R is just the rack mount receiver. The 7C is the "deluxe" version that includes the rack, coil box, power supply and speaker.

[@radiosantigosmecanicamaqui2456]

Vídeo muito instrutivo sobre os queridos HRO's. Possuo o exemplar do HRO JR, número de série N-224 de jun 1936. A parte eletrônica foi devidamente restaurada e funciona muito bem, só tenho a gaveta de 3,5 a 7,5 mhz; agora farei a restauraçâo da "lataria". Fte 73!. Motta PY2MAS.

[@mackfisher4487]

My a friend silent key used an HRO-50 for a CW Army Mars net, he always remarked of its sensitivity and stability ability to pull a CW signal on the mud.

[@I-95_Estates]

Hello. Thank you for the very detailed video! I have an HRO pre-WWII with a Royal Canadian Corps of Signals brass tag on top of the case. No serial number. It simply says, "Mod." where the serial number is blank. I am curious about the power supply. It has a built in speaker. It has the toggle and fuse on the face also. I'm fairly new to these and trying to research what I have. How can I send photos? Thanks!

[@garypoland5288]

Great job, thanks !!

[@CodfishCatfish]

What an awesome video! I have a couple of HRO 5’s and I’m going to check because the HRO 6 look vaguely familiar and what a find if I indeed have one!!. I’m really curious about the PSU because I have a couple of rack mount and a dog house and as a couple of these HRO’s come as part of a gift from a SK I don’t know what PSU went with what radio. I’m better educated thanks to this video. Thanks

[@Mikek2bn]

Great Presentation Hope you go on to do one on the transistorized HROS the 500 and 600. At one time I had both but I donated my 600 to the AWA hope you have seen it

[@brianharrison105]

"National Moving Coil Communication Receivers 1936-1949" followup presentation posted here soon

[@superhet7281]

Great job, Brian and looking forward to the moving coil presentation!

[@eddyaudio]

Excellent Video Presentation Brian AWA was Australian Company and that period solely owned by Australian Government the also made Teleradios as separate RX and TX that did Sterling service during WW2 for Coach Watches they Australian made and designed they used RCA patents the correct name is Amalgamated Wireless Australia like RCA and AWA only memories now.
AWA was a leading Electronic Company destroyed by incompetent CEO that got into Future Trading when core business was electronic as said it just a sad memory now,Regards Ian VK2IJ.

[@brianharrison105]

Thank you and apologies for butchering the AWA company name! I need to take the time to script each slide and then stick to the script:-) I'd love to see a presentation on Amalgamated Wireless Australia here soon (and I have collected a good bit of info to share if anyone wants it).

[@brianharrison105]

Here's the 1939 New Zealand Post Office video: th-cam.com/video/wBFwTtS4Pl0/w-d-xo.html

[@eugenecbell]

What is an HRO?

[@PaulSobon1]

More about the HRO here: en.wikipedia.org/wiki/National_HRO

[@eugenecbell]

@@PaulSobon1, so just a particular radio that was and still is populate, very good thank you.

[@doc145]

Some of National Radio's tool makers marked their overtime slips with HOR for "Hell Of a Rush." Management decided that a version of that abbreviation should be the name of the new receiver, choosing the slight alteration HRO to make it less objectionable.[2][3] That was quickly countered by saying that HRO stood for "Helluva Rush Order".[4]
Wikipedia