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 Post subject: Air-O-Ear 710-WN
PostPosted: Sep Wed 23, 2009 2:50 am 
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Hello Folks, not exactly a boat anchor but I have searched online and cannot seem to find any information on this unit. Dates to mid to late 1950s as it was advertized in Popular Science about 1956. I need a schematic for it. Can anyone steer me to any group or website that deals with old VHF-AM aviation receivers?

Thanks!


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 Post subject:
PostPosted: Sep Wed 23, 2009 4:34 am 
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Do a yahoo search using your post title. You'll find the first result is that SMC has a Sams folder with it and their FM3100 for six and a half bucks.

Mike

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 Post subject:
PostPosted: Sep Tue 29, 2009 4:45 pm 
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Mike,

Thanks for the post. The item you refer to shows up as:

"AIR-O-EAR Model: 711-WN 4-Band Table Radio"

It appears to be a different model than mine. The unit I have is a 710-WN and is a single band (aviation) receiver. It was manufactured by Nova Tech, Inc. in Manhattan Beach, CA.

Makes me wonder how many different models they made?

Anyone else?


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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: Nov Fri 25, 2011 6:42 pm 
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not to be resurrecting old topics from the grave... but was wondering if a schematic was ever located for this thing? Came into one and will likely need it to get her functioning again. Here's a pic of what we're talking about...

Image

(EDIT 2/27/12) I've since figured out that little piece was a low current selenium rectifier... but I have yet to find schematics.... still looking!

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Last edited by Ripp on Feb Mon 27, 2012 4:14 pm, edited 1 time in total.

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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: Nov Sat 26, 2011 2:49 am 
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Location: Arizona
Nova-Tech built a lot of low end aviation receivers, plastic table radios etc.
They show up on the 'bay frequently, cheap.
They also managed to build a few aircraft transceivers,
I have an extensive collection of general aviation radios and documentation going back to the 1930's.
Do not remember seeing anything on them. Possibly Sams Photofacts has something.
See
http://www.lloydsdipsydumpster.com/
if the subject interests you.
BTW the "capacitor" is probably a noise filter choke, just a coil of heavy wire that went in the input DC line, caps to complete were external.
Lloyd


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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: Dec Sun 29, 2013 5:31 pm 
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Anybody run up on a manual or anything for this?

Sams has a photofact for a 711, different beast.

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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: Dec Sun 29, 2013 8:25 pm 
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Quote:
Nova-Tech


Man I forgot all about those guys. As you said, they made really CHEEP stuff. If you ever find a need for a Narco VHT-3 manual I've got one, and an early mark 12 manual as well.

I had a display of old pull outs from Narco, Nova-Tech, aerotron, aero-ear, Lear, and others, in the display cases when I had the avionics shop. When FAA said all com/nav had to be TSO'd lots of stuff came outta the woods.

Image

The last relic from the shop I sold a couple years ago. Why I hung on to the thing for 50 years I'll never know.

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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: Jan Thu 09, 2014 10:16 pm 
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Digging from the grave: I have this receiver as well, it is built off a Granco FM receiver. Look in SAMS for GRANCO model 720. It has just a retuning to the 108-136mHz band and a new faceplate!


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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: May Tue 06, 2014 1:29 am 
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I know this post is old, but has anyone located a schematic on this receiver?


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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: May Tue 06, 2014 10:10 am 
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Location: Littlehampton England
I have a hand drawn circuit diagram of a plastic table model Air o ear with airband and VHF FM.
It has 12BA6,12BE6, 12DTB, 6BJ6, 12AU6, 12AX7 and 50EH5. Only the mixer and IF stages are shown in the drawing but the audio stages should be pretty simple.
Let me know if you'd like a scan. Could be better than nothing!

Jim G4XWD


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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: May Tue 13, 2014 3:04 pm 
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sure. what gets me on this radio is that FEDERAL device to ground from the squelch control with no values on it aside from some numbers and a "+", which is soldered to chassis ground. Why (if it is an electrolytic) would the "+" go to ground?


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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: May Tue 13, 2014 3:10 pm 
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it was a rectifier, not a capacitor. I tried putting a diode/resistor combo in there but the rest of the thing is so cobbled up from the previous owner it doesn't work anyway. :evil: It sits on the shelf waiting patiently for my return.

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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: May Wed 14, 2014 9:18 pm 
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really? Someone put a 47mfd 160v electrolytic in there on mine. would you consider selling yours as a parts set?
was that part blown on yours? what value resistor/diode did you try? How did you know it was blown, or you just wanted to replace it?
someone told me the Granco 610U schematic is the meat of this radio, I have that and can share with you.


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 Post subject: LDTY
PostPosted: Feb Mon 12, 2018 2:56 am 
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snowlion wrote:
Digging from the grave: I have this receiver as well, it is built off a Granco FM receiver. Look in SAMS for GRANCO model 720. It has just a retuning to the 108-136mHz band and a new faceplate!


A Long delayed/overdue thank you snowlion! Looked up a Granco 720 here:

http://www.radiomuseum.org/r/granco_720.html
Lo and behold a Granco 720 sure looks like it, especially the back panel.

Took it apart just now. Granco branded tubes, once I bothered to look. :oops:

Tube line up in mine [in NO particular order, all Granco brand with 1957 dates, differs from the 720's specs]:
12BA6 [MADE IN USA], 12AT7 [WITH SHIELD], 12BA6 [MADE IN WEST GERMANY], 50C5, 12BA6 [MADE IN WEST GERMANY], UNKNOWN [188-4 ??]

Keeping in mind this is an AM only, no FM [VHF aviation band only] receiver may explain the tube line up differences. As I understand it, Granco was more focused on FM versus AM radios.

I remember it not working when I was a wee lad in the mid-1960s. My Father eventually took it in to his "go-to" man for TVs: Roy's Radio & TV Service in Ferndale Michigan in 1975, they appear to have replaced the PS cap but nothing else. Don't recall them getting it working back then though and she's silent now.

Theres an article and a wiring diagram for the 720 here:

http://www.radiomuseum.org/r/granco_720.html#threadTop
Scroll down to the "granco: 720 Student Report"

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 Post subject: Re: Air-O-Ear 710-WN
PostPosted: Feb Mon 12, 2018 4:08 am 
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Bubbles. . . . . . .

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