My radio doesn't quite work right!
It hums! If you replaced the filter caps, there's a chance you have a weak rectifier tube or a bad audio amp tube.
It's deaf! Make sure your antenna is ok and wired properly. Try turning the radio. The antenna is directional. If that doesn't solve it you may have a weak tube.
It doesn't play very loud before it sounds fuzzy. You may have a weak audio amp tube. Peek inside the cabinet while the radio is on (remember not to touch any metal so you dont get shocked!) If you have a tube that has a deep violet or deep blue glow inside the glass while it's powered up it may be a worn audio amp tube. Note the position of the tube on the chassis, UNPLUG the radio, get the tube out and look up it's number on the web. If the tube comes up as being an audio amp tube it probably needs replacing . A common audio amp tube on AA5 radios is the 50L6 and the 35L6. They are cheap and easy to get from tube vendors.
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I get a raspy buzzing noise between stations. Electric eye lamps (lamps that turn off during the day automatically) have been known to create nasty noise on AM. Check on a known good AM radio to see if you get the same noise. If you do, your culprit is not the radio itself.
Radio sounds good at first then begins to sound distorted as time passes. You may have an out of spec resistor. While the radio is on, peek inside the cabinet being careful not to touch any metal so you don't get shocked. Look for a tube who's metal structure inside is glowing orange or red like its gonna melt. I'm not referring to the heater filaments as those are supposed to glow orange. If the tube structure itself is glowing from heat you may have a bias problem which is more than likely in the audio amp circuit of the radio. Obviously you can't perform this visual check on all metal tubes. Either way, it's time to get out the schematic and meter.
Hi i have a grundig satellit 700 radio the problem is i can only get the fm band working,when i try the am mw or lw they are completely dead just a slight hissing,any help would be great. Just use common sense. For example we have radio ABC, I rate it as a $50.00 radio. However it has a knob missing, a couple tubes, and some nicks. This might bring the value down to $35.00. Lets take the same radio, and say it works, but has a small scratch, and has an excellent original finish with nothing missing. We are the Radio People, our foundation was formed on Engineering, Design and our Customers. Grundig Radio Repair Grundig Radio Repair. We are the Radio People, our foundation was formed on Engineering, Design and our Customers. Grundig Radio Repair Grundig Radio Repair. This was the first Grundig valve radio that either of us have attempted to restore but we encountered much the same problems with this set as with many other UK, German and North American valve radios built in the 1950s.
Following these same instructions I have resuscitated several old tube radios. The AA5 was built for simplicity thus there isn't much to go wrong and they are forgiving. Once your radio is up and running, enjoy it. Use it every so often. Just like an antique car, its bad to have it sit unused. Fire it up every now and then and show off your work!
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