radio receiver

jaudio · 18th July 2005, 10:04 PM

I have a stromberg-Carlson radio receiver(No.400 H) that I would like to repair. I think all the tubes lights up but I not sure because two have black glass or are incased. Suggestion will be great appreciated.

Pentium100 · 19th July 2005, 12:06 AM

How to test the tubes to see if heaters are OK. Power up the radio. Make sure that capacitors are not hot and fuse does not blow (or you can disconnect B+ at all). Eait about 10min and touch the tube. If heater is OK then the tube will be warm.

jaudio · 19th July 2005, 01:57 PM

the tube are all warm but I still get no sound other than very low static.

Tom Bavis · 19th July 2005, 02:01 PM

Those metal tubes can get pretty hot - shouldn't be any doubt once it's been on a few minutes...
ect. Some hum is a good sign.

If there's no sound at all from the speaker, the speaker field coil or output transformer is susp
Schematic is here: http://www.nostalgiaair.org/PagesByM...8/M0021498.pdf

No voltages listed - but if you can measure the voltages at each tube socket pin, it shouldn't be hard to diaqgnose. BUT... if you haven't worked with high voltage before, you should find an experienced person to help and point out the hazards. This set has a power transformer, so shock hazards are less likely but MORE DEADLY.

jaudio · 19th July 2005, 09:05 PM

Thanks for the link. I have worked with high voltages before. Thanks again.

18th July 2005, 10:04 PM	#1
jaudio diyAudio Member Join Date: Oct 2004	radio receiver I have a stromberg-Carlson radio receiver(No.400 H) that I would like to repair. I think all the tubes lights up but I not sure because two have black glass or are incased. Suggestion will be great appreciated.

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19th July 2005, 12:06 AM	#2
Pentium100 diyAudio Member Join Date: Jun 2004 Location: Kaunas	How to test the tubes to see if heaters are OK. Power up the radio. Make sure that capacitors are not hot and fuse does not blow (or you can disconnect B+ at all). Eait about 10min and touch the tube. If heater is OK then the tube will be warm.

19th July 2005, 01:57 PM	#3
jaudio diyAudio Member Join Date: Oct 2004	the tube are all warm but I still get no sound other than very low static.

19th July 2005, 02:01 PM	#4
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Those metal tubes can get pretty hot - shouldn't be any doubt once it's been on a few minutes... ect. Some hum is a good sign. If there's no sound at all from the speaker, the speaker field coil or output transformer is susp Schematic is here: http://www.nostalgiaair.org/PagesByM...8/M0021498.pdf No voltages listed - but if you can measure the voltages at each tube socket pin, it shouldn't be hard to diaqgnose. BUT... if you haven't worked with high voltage before, you should find an experienced person to help and point out the hazards. This set has a power transformer, so shock hazards are less likely but MORE DEADLY.

19th July 2005, 09:05 PM	#5
jaudio diyAudio Member Join Date: Oct 2004	Thanks for the link. I have worked with high voltages before. Thanks again.

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