Home  Resources  References  Tubes  Forums  Links  Support  Sale  Search 



   < Previous Message Index Next Message >   


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

Posted by Dave Froehlich on 04/27/2010 15:15

Warren,
I tried this. The radio plays fine but the light bulb will not work. I even tried a 3 volt bulb and nothing will work but it works fine with a "Real" ballast tube. I have no idea what's wrong. I'm using a 50 ohm 10 watt resistor. I don't think that 10 ohm is going to make the bulb not light up at all.
I have checked and double checked all the solder connections. The 50 ohm resistor runs from pin 7 to pin 8. The capacitor runs from pin 3 to pin 7. The light bulb has to work but it wont work. What do you think might be happening?

Thanks,

Dave
:Here is a link showing the AC capacitor trick. For your dial lamp, lift the heater ground on the last tube in the series. Add your dial lamp now in series to ground, shunt the lamp with a 47 ohm 1 watt resistor.
:
:http://www.oldradiosrus.com/build.html
:
:Runs cool, slow start, tubes like it and last longer.
:
:IPAddress: ***.81.29.49

IPAddress: ***.58.185.194


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 

   < Previous Message Index Next Message >   




© 1996-2004 Nostalgia Air