501


Home Up 1R5 501

 

 

This 1952 Packard Bell 501 is inside an end table with a coin operated timer.  It was used inside of hotel rooms.  A typical AA5 with tuning, volume and tone control.  The line cord is routed through the coin box timer.   

 

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Bedside end table.  

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This paper dial scale will be used to insure proper positioning of the tuning indicator.  An exact size is not needed since the number position radius is maintained with any scaling. 

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The challenge for this restoration is the tuning gang.  It will need replaced or repaired.  This should be no big deal.  

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This appears to never have been worked on.  All caps (except ceramics) and resistor get replaced.  I do not want this send back due to a changed 10 cent resistor.  

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The rectifier tube 35Z5 tested good in the tube tester.  It does not work in the radio.  One half of the filament is bad. 

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Look for the scrapes on the right gang. These bent veins short.  

I did not have a replacement in the garage.  So on to repair.  First is to sand off the metal burrs. IMG_4378.JPG (289427 bytes) 

If I meet with failure then I would find a compatible replacement on the eBay. There is nothing to loose at this point. 

I used a long razor knife and a flashlight behind the gang to look for touching plates.  Also A DVM with the continuity beeper helps. 

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Patients and care yielded success!

Officially this is called "Knifing". No Joke! 

A good washing in the sink with Clorox Clean Up and a tooth brush. The brown plastic is in good condition.  These knobs were dirty. 

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The gold paint is a bit rough.

After 30 minutes warm up/burn-in the alignment begins.  Tubes and parts heat up and drift for a while.  It is SOP. 

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A full electrical alignment has been completed.  And the radio is happily playing away.  This begins the "burn-in" period.  

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Mask off the centers. 

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Spray with Testors Gold. It looked to be the closest match.  There is also GM Gold that is a bit less yellow and a bit on the copper side. 

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Looks nice.

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Tony Bennett sounding great!  10PM starts old time radio stories.  The Tails of the Texas Marshals is on first. 

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Cleaned up chassis and tubes. 

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Gotta have a night shot of the glowing tubes.  

The only thing left is to receive the Isolation transformer, connect it to the line cord and burn-in.  Well nothing should "burn".  It just means to run the unit for a time period.  If there is anything to break.  It is best to happen here on the bench and not with the owner. 
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The new 50va Isolation Transformer on the left. 

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The chassis consumes 28 watts.   

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Tractor Supply "Flock Block" on the left. 

"Buck Block" on the right.

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The end.

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This is a video of radios that are being interfered with.  The station at the low end of the tuning band about 540 has another near station on the same frequency.  It sounds like a howl.  Up the band a high pitched whistle is heard.  That is common interference heard mostly at night.  

Even an expensive ham radio transceiver can not eliminate the lower howl of two radio stations on the same frequency.

More advanced radios have whistle filters that reduce this higher pitched sound.  

nostalgiaair.org schematic.

 

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