Hi All
I'm working on a St. Regis Model 676, which I found out by researching was made by International Radio Corp. but to cut to the chase, I have a tube in this radio, that best I can tell is used as some sort of regulation for the pilot lamp, it appears by looking at the schematic that the pilot lamp is tied into the filament portion of this tube, which to me looks like it is providing a current regulation to the lamp, am I looking at this right, or is this being used in another way?
Mark

Hi Mark

165R4 is a ballast tube. Ballast tubes were used in series with filaments to drop voltage. 165R4 is rated to drop 49 volts @ 300 ma. As long as it's not open the tube is good. If open you could replace it with wire wound resistors.

One section will be wired across your lamp. This prevents the lamp from burning out on turn on.

Norm

:Hi All
:I'm working on a St. Regis Model 676, which I found out by researching was made by International Radio Corp. but to cut to the chase, I have a tube in this radio, that best I can tell is used as some sort of regulation for the pilot lamp, it appears by looking at the schematic that the pilot lamp is tied into the filament portion of this tube, which to me looks like it is providing a current regulation to the lamp, am I looking at this right, or is this being used in another way?
:Mark
:

:Hi Mark
:
: 165R4 is a ballast tube. Ballast tubes were used in series with filaments to drop voltage. 165R4 is rated to drop 49 volts @ 300 ma. As long as it's not open the tube is good. If open you could replace it with wire wound resistors.
:
: One section will be wired across your lamp. This prevents the lamp from burning out on turn on.
:
:Norm
:
::Hi All
::I'm working on a St. Regis Model 676, which I found out by researching was made by International Radio Corp. but to cut to the chase, I have a tube in this radio, that best I can tell is used as some sort of regulation for the pilot lamp, it appears by looking at the schematic that the pilot lamp is tied into the filament portion of this tube, which to me looks like it is providing a current regulation to the lamp, am I looking at this right, or is this being used in another way?
::Mark
::Hi Norm
Yep I did a little research after I posted the question, and found out just that, it is a ballast tube, I ohmed it out and its still right on the money as far as resisitance, thanks for the info:)
Mark