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Antique Radio Technical Forum
L-49B Ballast tube. What are the resistor values inside?

Posted by Dave Froehlich on 01/15/2010 16:31

Warren,
The radio is a Majestic Charlie McCarthy Number 1 radio. I will have to replace the burned out 40 ohm section with a 40 ohm power resistor. I cannot find a replacement L-49B, but it looks like there's plenty of room for it inside the tube. The other section of the ballast is fine. Is this a 10 Watt resistor or a 5 watt resistor (pin 7 to 8)? A 50 ohm 10 Watt resistor worked with no bulb in the socket.

Thanks,

Dave
:A 46 lamp, is a 6.3 volt. But is screw base. The resistor of 40 Ohms is the shunt across the lamp only on pins 7 & 8 of the ballast tube. If you just want to test your radio, leave the dial lamp and ballast tube out. Connect a 200 Ohm 20 watt resistor on pins 3 & 7 of the ballast tube socket. Don't know what the model radio you have. But you can look at an Emerson BJ200, it has the same ballast tube and circuit.
:
:IPAddress: ***.24.247.210

IPAddress: ***.71.19.181


L-49B Ballast tube. What are the resistor values inside? 
Dave Froehlich 01/13/2010 20:42 
Warren 01/13/2010 23:32 
Dave Froehlich 01/14/2010 17:01 
Warren 01/14/2010 19:05 
Warren (P/S) 01/14/2010 20:39 
Dave Froehlich 01/15/2010 16:31 
Warren 01/15/2010 17:04 
Dave Froehlich 03/17/2010 15:00 
Warren 03/17/2010 15:32 
Dave Froehlich 03/17/2010 15:49 
Dave Froehlich 03/17/2010 15:50 
Dave Froehlich 04/27/2010 15:15 
Warren 04/27/2010 16:00 
Dave Froehlich 04/27/2010 16:12 
Dave Froehlich 04/27/2010 17:03 
Warren ( That's cool then ) 04/27/2010 19:46 
Warren 04/27/2010 17:18 
Dave Froehlich 04/27/2010 15:21 
Chuck 02/09/2010 02:04 

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