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Vintage radio not working anymore

post #1 of 10
Thread Starter 


I was working fine 2 years ago but now it doesn't power on.

More pics here:
Index of /arhiv/Sup/Tech/Radione 766 duplex

Theres an unhooked cable but thats my work, it was only holding on on a thin wire.

Found out what model it is and year it was made:
Duplex 766W Radio Radione; Wien (R


If it were the tubes I would still get some power or distorted sound right? Is it worth fixing it or should I just leave it as it is
post #2 of 10
Nice.

If you have a multimeter, perhaps tracing the voltage coming in to see where it stops would be a good place to start. A visual inspection of caps and such would also be in order since they give out when they get particularly old. Do the tubes power up or light up?
post #3 of 10
That's a sweet radio.

Do your tubes get warm? It's possible for a single tube to have a dead heater and for you to hear nothing from the radio. Tubes are the ultimate in soft-start so you don't normally hear a dead one.
post #4 of 10
Just a word of caution, as bhjazz suggests, checking it out with a multimeter is a good place to start, but most of those old radios are simple ac/dc with a potentially hot chassis. Be careful when measuring it under voltage.
post #5 of 10
Thread Starter 
Ok thanks guys I'll buy a multimeter soon. The tubes don't get warm, maybe I should give them more time to power up since the radio hasn't been used for the past 4 years (since my grandpa has deceased-it was his) before that my grandpa would listen to it everyday at his workshop. Not sure if those tubes can still be bought somewhere. It seems like the radio doesn't get any power. Power outlet is good as I hooked up my Logitechs to the same outlet and it worked fine.
post #6 of 10
I'd give them a good 10 minutes to get warm to the touch. But, check continuity around the transformer, it doesn't need to be on for that!
post #7 of 10
Before you stick a hand in that radio look at some sites discussing the All American 5 radios and other antique radios and also sites about electrical safety. Many of these sites discuss radio repair and updating also.

I don't see a transformer associate with a power cord. If it is an AC/DC radio the chassis will be hot (same as mains voltage) either when the radio is on or when it is off, if the radio is plugged in, depending how the plug goes into the outlet. The "parts" themselves carry high voltage when operating of course.

Get youself an isolation transformer too. Be careful; be alert.

Its a beautiful radio. If you cannot easily fix it I hope you will get it repaired.

F
post #8 of 10
Definitely fix it or have it fixed, especially given it was your Grandpas. These old radios have a look and sound all of their own, not Hi-Fi but still enjoyable.

If it was working when stored away then it is more likely that the old paper capacitors have dried out than for a tube to have failed. This site Phil's Old Radios - Beginner's Corner has an article on replacing capacitors as well as general info on fixing old radios. Otherwise if still not confident see if there are any Vintage Radio Clubs in your area, you may be able to get help or find someone who can do it for you.
post #9 of 10
Beautiful radio! Yes, it can be fixed and yes, you should.

I'm not familiar with that model, however, take the advice here about the hot chassis. Most of them are. Also, there's a fair chance that there isn't a power transformer inside. If you add upnall the tube voltages (the first number in the tube designation) theyb should add up to 115 or 120 - the same as line voltage.

Most likely, you have an issue with the power supply. The old filter caps in tube radios usually go bad. Usually, the set will still light and make a "motorboating" sound, which is what happens when the filters are passing AC. Or they might pass nothing if they're completely open. You might have a blown rectifier tube, though. It might even be as simple as a blown fuse, though many old radios don't have fuses.

I doubt the problem is anywhere else besides the power supply because radios usually will light up and make some sound, even with a bad tube or other parts.

You absolutely can get new tubes, too. Check Antique Electronic Supply at Antique Electronic Supply. Radio tubes aren't anywhere as ridiculous as audio tubes - you can probably retube it for under $50.

If you want to use it regularly, I strongly recommend replacing most of the guts. The filter caps must go first. Modern ones are far better and will last. The capacitors are probably the old wax and paper types. Those get hot, the wax melts, they go out of spec, then then open up and die. They're awful - get them out. There will be some mica resistors in there, which are OK and can be left. But the carbon comp resistors are bad, too. They start to drift in value as they heat up. Eventually, their values change permanently and still drift with heat.

I recommend you skip boutique parts and go with Sprague Orange Drops ($1-$2 each) for the caps. Most modern electrolytics do a good job on the filters, and same with metal film resistors. You should be able to get everything you need for $30-$40. Radio is much more affordable than hi-fi.

You should also check to see if you can order a Sam's Photofacts for your set. Those are priceless. They have a complete parts list with values, photo guide, schematics, alignment instructions, and much else that covers everything inside.

Once you get the innards sorted, you'll want to align the set. You don't have to do it - any radio repair guy can. You just need a RF signal generator and a couple of tools. You'll want to realign after replacing parts - someimes they go a little off after you do that.

If you're looking for a shop or someone to help, visit ARRLWeb: ARRL Home Page and check for a local amateur radio group. Contact them and ask if the know someone who works on old radios. I promise you they'll know someone, if not many.

Finally, that's a multiband radio. I can't see the markings, but it will pick up shortwave and probably a bit else. When you get it working (and you better, or I'll bug you ) look into using a proper antenna for it. You'll be able to tune in stations the world over.

Good luck and let us know when you have it working!
post #10 of 10
Thread Starter 
Thanks Erik
found a nice European store:
TAD/Sprague Orange Drop, Capacitors

Should I take some more pics to find out which ones I need?
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