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CASE STUDIES

 ARVIN MODEL 441T

Most of the radios we repair (>90%), malfunction because of electrolytic capacitors or bad tubes. 

The radio on the right is the underside of an Arvin model 441T (or Hopalong Cassidy Radio). This radio (4 tube) has a metal case with likenesses of Hopalong Cassidy imprinted on the front.

It is worth about $700.00 (retail) if it is in working condition.

The owner said that it did not work and asked me to replace the Electrolytics and bring it back to a working state.

I asked the owner to ship to me using a doubled box configuration due to the value of the radio. It arrived with no perceptible damage. As usual, I did not plug it in until I could assess the state of the Electrolytics.

It was discovered that this radio had a "floating" ground which was necessitated by the metal cabinet.

Arvin 441T
 

At first glance one can see the large red tubular capacitor in the right hand corner. This is a multi section electrolytic with 30mfd and 50mfd capacitors. Also, the large yellow tubular capacitor (which is in the audio section) has a rated value of 16mfd. So there are a total of three Electrolytics. They tested out as follows:

16mfd tested at .40mfd/30mfd tested at .5mf/50mfd tested at .001mfd

Those values were the primary reason that the radio did not play. The 16mfd capacitor was replaced with a 22mfd, and the other two capacitors were replaced with 47mfd caps. The radio then played very well.

The line cord was frayed, so a new line cord was installed. A better long wire antenna was installed in the back, and missing back plate screws were inserted to hold the back plate in place.

 

 

 

 

 

 

 

 

 
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Bethesda, MD
CELEBRATING OUR 12TH YEAR

OVER 600+ RADIOS SERVICED