Having problem getting a Dewald model A 500 to work. Have re-capped and checked all resisters and tubes. The problem is as soon as power is applied, the pilot lamp immidiatley burns out. I am getting line voltage at pins 2 and 3 on the 35Z5 tube.This is a pretty simple circuit and it has me stymied. Any help or suggestions will be greatly appreciated.Jon

Jon, the heater on the 35Z5 is tapped for a lamp. Half of the heater is probably open. Try replacing the 35Z5. Or, pull the tube and check for continuity between pins 2 and 7. If open, then the tube is shot.

:Having problem getting a Dewald model A 500 to work. Have re-capped and checked all resisters and tubes. The problem is as soon as power is applied, the pilot lamp immidiatley burns out. I am getting line voltage at pins 2 and 3 on the 35Z5 tube.This is a pretty simple circuit and it has me stymied. Any help or suggestions will be greatly appreciated.Jon

Hi Jon,

It sounds as though the 35Z5 filament is open between pins 2 and 3 (pilot lamp tap). Use your ohmmeter and measure for continuity between these pins. If it is open it will blow the pilot lamp. Your measuring line voltage between pins 2 and 3 is a pretty good indication that that section is open.

Radiodoc

::Having problem getting a Dewald model A 500 to work. Have re-capped and checked all resisters and tubes. The problem is as soon as power is applied, the pilot lamp immidiatley burns out. I am getting line voltage at pins 2 and 3 on the 35Z5 tube.This is a pretty simple circuit and it has me stymied. Any help or suggestions will be greatly appreciated.Jon
:
:Hi Jon,
:
:It sounds as though the 35Z5 filament is open between pins 2 and 3 (pilot lamp tap). Use your ohmmeter and measure for continuity between these pins. If it is open it will blow the pilot lamp. Your measuring line voltage between pins 2 and 3 is a pretty good indication that that section is open.
:
:Radiodoc
:
Thanks Doug and Radiodoc, I had checked pins 2&3 before posting here, they were good. I even tried same tube from working radio and still blows lamp. With cold tube the lamp starts out dull like you would expect then increases in brightness quickly then blows. I also am getting a loud buzzing from the speaker that increases in volume with lamp brightness. Electrolytics are new and polarity is correct. Will keep trying. Thanks, Jon.

Then your problem is a short in the B circuit. If your electrolytics are installed correctly with regard to polarity, then there must be some other short. Keep looking, and also check tubes for internal shorts, though it's more likely a wiring issue. Be sure that you used all condensers capable of handling at least 150 volts. If you didn't replace all of the condensers, then you need to check the remaining old ones. I know that you said that you replaced all, but some people say that they replaced all even though they left some in. Not sure why, but that's what I hear from time to time.

Thomas

:Then your problem is a short in the B circuit. If your electrolytics are installed correctly with regard to polarity, then there must be some other short. Keep looking, and also check tubes for internal shorts, though it's more likely a wiring issue. Be sure that you used all condensers capable of handling at least 150 volts. If you didn't replace all of the condensers, then you need to check the remaining old ones. I know that you said that you replaced all, but some people say that they replaced all even though they left some in. Not sure why, but that's what I hear from time to time.
:
:Thomas

Thomas and others, Many thanks, I had overlooked a cap that was pretty well covered up by some wires and components. Replaced cap and it now plays very well. Again a big thank you to all that responded to my post. Regards, Jon.

::Then your problem is a short in the B circuit. If your electrolytics are installed correctly with regard to polarity, then there must be some other short. Keep looking, and also check tubes for internal shorts, though it's more likely a wiring issue. Be sure that you used all condensers capable of handling at least 150 volts. If you didn't replace all of the condensers, then you need to check the remaining old ones. I know that you said that you replaced all, but some people say that they replaced all even though they left some in. Not sure why, but that's what I hear from time to time.
::
::Thomas
:
:Thomas and others, Many thanks, I had overlooked a cap that was pretty well covered up by some wires and components. Replaced cap and it now plays very well. Again a big thank you to all that responded to my post. Regards, Jon.

Jon,

Bet it was a good feeling to get the old radio going. It pleases me to know there are others who are willing to roll up their sleeves and make an attemp to preserve the history of radio especially those of the younger generation.

Radiodoc

:::Then your problem is a short in the B circuit. If your electrolytics are installed correctly with regard to polarity, then there must be some other short. Keep looking, and also check tubes for internal shorts, though it's more likely a wiring issue. Be sure that you used all condensers capable of handling at least 150 volts. If you didn't replace all of the condensers, then you need to check the remaining old ones. I know that you said that you replaced all, but some people say that they replaced all even though they left some in. Not sure why, but that's what I hear from time to time.
:::
:::Thomas
::
::Thomas and others, Many thanks, I had overlooked a cap that was pretty well covered up by some wires and components. Replaced cap and it now plays very well. Again a big thank you to all that responded to my post. Regards, Jon.
:
:Jon,
:
:Bet it was a good feeling to get the old radio going. It pleases me to know there are others who are willing to roll up their sleeves and make an attemp to preserve the history of radio especially those of the younger generation.
:
:Radiodoc
:
Radiodoc, Being 47 years old, it's nice to be refered to as "the younger generation". But what you said about preserving the history of radio really struck home. I have only been afflicted by this addiction for several years but I really get a bang out of restoring these objects of beauty. I still have much to learn and the from the hard ones I learn the most and it is because of generous people at this forum and others I've met that allow me to gain some of this lost art. many thanks, Jon.