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

Posted by Dave Froehlich on 03/17/2010 15:00

Warren,
10 watt resistors are way too small. The radio plays fine with the resistors but they smoke. So I will have to find a real ballast tube.
I can also spend $$$$ for very large adjustable resistors. But they wont fit inside the cabinet. I really have to find a genuine L49B.

Thanks,

Dave
:Pins 8 & 7 are the 40 ohm section. 50 ohm 10 watt should be fine. Also a L-49BG is the same ballast tube, but is glass. Still think you would be better off to use an AC capacitor from pins 3 & 7 .. Put your dial lamp in series with the last tube heater going to ground. Shunt the lamp with a 47 ohm 1 watt resistor.
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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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