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 Post subject: Stewart warner 9007 G questions
PostPosted: Jul Thu 19, 2018 2:14 am 
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Joined: Apr Sat 29, 2017 6:22 pm
Posts: 165
I have one end of the battery cable plugged into the 3q5 socket. It was how I received it. I get small filter hum with it this way. I unplugged it and plugged in a 3q5 now I get nothing from the speaker, the neon lamp is flashing fast. With the cable plugged into the socket it flashes slowly. I don't understand this, could someone explain this? Any ideas?


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 Post subject: Re: Stewart warner 9007 G questions
PostPosted: Jul Thu 19, 2018 2:26 am 
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Joined: Nov Tue 14, 2017 5:09 am
Posts: 2992
Location: Austin, Texas
If you powered the radio on AC with the battery plug in the 3Q5 socket, it's likely you have several damaged components.

Jay


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 Post subject: Re: Stewart warner 9007 G questions
PostPosted: Jul Thu 19, 2018 2:33 am 
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Joined: Apr Sat 29, 2017 6:22 pm
Posts: 165
Drats! Such as what components?


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 Post subject: Re: Stewart warner 9007 G questions
PostPosted: Jul Thu 19, 2018 2:40 am 
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Joined: Nov Tue 14, 2017 5:09 am
Posts: 2992
Location: Austin, Texas
First off, I don't understand how the battery cable could plug into the 3Q5 socket. It should have one pin off center that would prevent it from plugging into a tube socket. Does the cable connector look like the one on the schematic or is it something different?
Attachment:
Bat-1.png
Bat-1.png [ 49.9 KiB | Viewed 600 times ]



Jay


Last edited by JnTX on Jul Thu 19, 2018 2:47 am, edited 1 time in total.

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 Post subject: Re: Stewart warner 9007 G questions
PostPosted: Jul Thu 19, 2018 2:47 am 
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Joined: Apr Sat 29, 2017 6:22 pm
Posts: 165
The offset pin goes right into the keyway of the socket. From what I can tell it matches.


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 Post subject: Re: Stewart warner 9007 G questions
PostPosted: Jul Thu 19, 2018 3:02 am 
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Joined: Nov Tue 14, 2017 5:09 am
Posts: 2992
Location: Austin, Texas
It's difficult to say what might have been damaged but it looks like you can short the plate pin to ground which would explain the hum from the speaker. The power supply was probably in high overload. Depending on switch positions, you may have applied B+ to the tube filament string which would have burned out at least one tube. You may have a lot of debug to do.

Jay


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 Post subject: Re: Stewart warner 9007 G questions
PostPosted: Jul Thu 19, 2018 3:47 am 
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Joined: Apr Sat 29, 2017 6:22 pm
Posts: 165
Sure enough 2 tube were out. I am getting an extremely weak signal through it now at least it's working! I'll order some known good tubes and troubleshoot from the. I think it's in the audio stage. Thanks!


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