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[Music] for me this is where it started a lot of radio and electronics that's lasted a lifetime well hello again everybody and today on the bench we've got a national hro receiver i really wasn't joking when i said that my obsession for radio and electronics started with a little red lamp because it did just that it started with a little red lamp on the national hro receiver of a radio that used to belong to my grandfather i'm sorry to say that this isn't the actual radio that used to belong to my grandfather all those years ago but it's certainly a very similar model and some of my earliest and fondest memories would have been sitting on his knee just tuning the dial and listening to all these foreign stations coming in from all around the world it was absolutely mesmerizing to me at the time but at the age of five or six years old i'm sure i was still more interested in this love little jeweled lamp here the story of the national hro communication receiver started back in 1935 when the american general electric company won a government contract to actually manufacture a communication receiver for the military and it is somewhat amazing that the general electric company did win that government contract given that they'd never built a radio before so the general electric company had to find somebody that could both design and manufacture a radio for them and they turn to the national radio company based in molden massachusetts now there's two features of our hro receiver here that make it completely and instantly recognizable the first of those features is this very large and in fact in some ways overbearing this is actually what they call the epicyclic tuning control and the second feature is these very large plugable coils so depending on what band you want to listen to you need to have a coil pack for that band that covers that frequency range now there was actually more than 17 of these coil packs in total and that gave the receiver a frequency range between 100 kilohertz and 54 megahertz as you can see i've got just a few of those coil packs here taking a close look at this particular coil pack i can see that this one it's got a frequency range of about 0.48 megahertz 2.96 so not a very wide bandwidth there we've only got 500 kilohertz approximately haven't we and looking at it at the top side here we've got one two three four we've got four separate coil boxes now each of those coil boxes has a number of little contacts on it and if you were to look inside the radio receiver here if you look inside it you'd actually see some brass or copper fingers that hang down and when you actually push the coil pack into the radio receiver those contact fingers they make contact with these little...