Dial light Problem

6/8/2003 2:17:36 PMBudfour

While changing a burned out bulb on a Watterson Mod.522 I mistakingly let the hot side of the socket touch the top of the bracket that holds the bulb socket.There was what seemed like a 110 volt flash,which knocked the circuit breaker off.I did not know such voltage existed on the dial circuit.After replacing the bulb with a new one,the new one's don't last very long.They come on dim at first and then brightin up as they should, but begin to flicker and burn out.I am replacing with 6 volt 150 ma bulbs,dont know if this is correct.Please help this novice,Thanks

6/8/2003 2:53:21 PMNorm Leal

Hi Budfour

Have elecrolytic filter caps been replaced? They can overload your rectifier and cause this problem. Also check the rectifier tube. The lamp is wired across a section of this tube.

There isn't a power or isolation transformer in an AC/DC radio. The AC line is connected directly to radio circuit.

If your radio uses a 35W4, 35Z5GT or 35Y4 rectifier a #47 lamp is correct, 6.3 volts @ 150 ma. If the rectifier is 25Z5 or 25Z6GT a 250 ma lamp should be used.

Norm

:While changing a burned out bulb on a Watterson Mod.522 I mistakingly let the hot side of the socket touch the top of the bracket that holds the bulb socket.There was what seemed like a 110 volt flash,which knocked the circuit breaker off.I did not know such voltage existed on the dial circuit.After replacing the bulb with a new one,the new one's don't last very long.They come on dim at first and then brightin up as they should, but begin to flicker and burn out.I am replacing with 6 volt 150 ma bulbs,dont know if this is correct.Please help this novice,Thanks

6/8/2003 3:03:19 PMBudfour

:Hi Budfour
:
: Have elecrolytic filter caps been replaced? They can overload your rectifier and cause this problem. Also check the rectifier tube. The lamp is wired across a section of this tube.
:
: There isn't a power or isolation transformer in an AC/DC radio. The AC line is connected directly to radio circuit.
:
: If your radio uses a 35W4, 35Z5GT or 35Y4 rectifier a #47 lamp is correct, 6.3 volts @ 150 ma. If the rectifier is 25Z5 or 25Z6GT a 250 ma lamp should be used.
:
:Norm
:
::While changing a burned out bulb on a Watterson Mod.522 I mistakingly let the hot side of the socket touch the top of the bracket that holds the bulb socket.There was what seemed like a 110 volt flash,which knocked the circuit breaker off.I did not know such voltage existed on the dial circuit.After replacing the bulb with a new one,the new one's don't last very long.They come on dim at first and then brightin up as they should, but begin to flicker and burn out.I am replacing with 6 volt 150 ma bulbs,dont know if this is correct.Please help this novice,Thanks

6/8/2003 3:17:59 PMBudour

:Hi Budfour
:
: Have elecrolytic filter caps been replaced? They can overload your rectifier and cause this problem. Also check the rectifier tube. The lamp is wired across a section of this tube.
:
: There isn't a power or isolation transformer in an AC/DC radio. The AC line is connected directly to radio circuit.
:
: If your radio uses a 35W4, 35Z5GT or 35Y4 rectifier a #47 lamp is correct, 6.3 volts @ 150 ma. If the rectifier is 25Z5 or 25Z6GT a 250 ma lamp should be used.
:
:Norm
:
::While changing a burned out bulb on a Watterson Mod.522 I mistakingly let the hot side of the socket touch the top of the bracket that holds the bulb socket.There was what seemed like a 110 volt flash,which knocked the circuit breaker off.I did not know such voltage existed on the dial circuit.After replacing the bulb with a new one,the new one's don't last very long.They come on dim at first and then brightin up as they should, but begin to flicker and burn out.I am replacing with 6 volt 150 ma bulbs,dont know if this is correct.Please help this novice,Thanks